criyle/codenet-compile-errors huggingface dataset:
Language: C++

using namespace std;
int main()
{
  char c[1000000];
  cin>>c;
  int a[29];
  for(int i=0;i<29;i++){
   a[i]=0;   
  }
  for(int i=0;i<strlen(c);i++){
      a[c[i]-'a'+1]++;
  }
  int k=0;
  for(int i=0;i<26;i++){
   if(a[i+1]==0){
      
       char d='a'+i;
       cout<<d;
       
       k=1;
       break;
   }
  }
  if(k==0){
   cout<<"None";   
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin>>c;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:10:17: error: 'strlen' was not declared in this scope
   10 |   for(int i=0;i<strlen(c);i++){
      |                 ^~~~~~
a.cc:1:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
  +++ |+#include <cstring>
    1 | using namespace std;
a.cc:18:8: error: 'cout' was not declared in this scope
   18 |        cout<<d;
      |        ^~~~
a.cc:18:8: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:25:4: error: 'cout' was not declared in this scope
   25 |    cout<<"None";
      |    ^~~~
a.cc:25:4: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include <bits/stdc++.h>
using namespace std;

string s;
int a[100];

int main(){
  cin >> s;
  for(int i = 0 ; i < s.length(); i++){
        a[ s[i] - 'a' ] =  1;
   }
  
   int  flag = 1; 
   char  ch = 'a';  
 for (int i=0 ; i < 26; i++){
      if (a[i]==0){
          ch = ch + i;
          flag  = 0;
          break;
     }
if (flag ) 
   cout<< "None" <<endl;
else 
   cout<<ch<<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:7:11: note: to match this '{'
    7 | int main(){
      |           ^
Language: C++

#include<iostream>
#include<cstring>
#include<cstdio>
#define MAXN (int)1e5+10
using namespace std;

char s[MAXN];

int main()
{
	bool al[200];
	memset(al,false,sizeof(al));
	gets(s);
	for(int i=0;i<strlen(s);i++)
	{
		al[(int)s[i]]=true;
	}
	for(int i='a';i<='z';i++)
	{
		if(!al[i])
		{
			cout<<char(i)<<endl;
			return 0;
		}
	}
	cout<<"None"<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   13 |         gets(s);
      |         ^~~~
      |         getw
Language: C++

#include <algorithm>
#include <iostream>
#include <vector>
#include <map>
#include <cmath>
#include <cstdio>

using namespace std;

int main(){
  char s[100000] = "";
  int count[26] = {};
  cin >> s;
  for (int i=0;i<strlen(s);i++) {
    count[(int)s[i]-97] = 1;
  }
  for (int i=0;i<26;i++) {
    if (count[i]==0) {
      cout << (char)(i+97) << endl;
      return(0);
    }
  }
  cout << "None" << endl;
  return(0);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:18: error: 'strlen' was not declared in this scope
   14 |   for (int i=0;i<strlen(s);i++) {
      |                  ^~~~~~
a.cc:7:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    6 | #include <cstdio>
  +++ |+#include <cstring>
    7 |
Language: C++

#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include <vector>
#include <list>
#include <string>
#include <iomanip>
#include <algorithm>
#include <functional>
#include <climits>
#include <map>
#include <math.h>
#include <queue>
#include <stack>
#include <set>
#include <random>
using namespace std;


int main() {
	char c[26] = { 'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z' };

	map<char, char> dic;

	for each (auto  i in c)
	{
		dic[i] = i;
	}

	string str;
	cin >> str;

	for (int i = 0; i < str.length(); i++) {
		dic[str[i]] = '0';
	}

	for each (auto  i in dic)
	{
		if (i.second != '0') {
			cout << i.second << endl;
			return 0;
		}
	}

	cout << "None" << endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:13: error: expected '(' before 'each'
   24 |         for each (auto  i in c)
      |             ^~~~
      |             (
a.cc:24:19: error: expected primary-expression before 'auto'
   24 |         for each (auto  i in c)
      |                   ^~~~
a.cc:24:13: error: 'each' was not declared in this scope
   24 |         for each (auto  i in c)
      |             ^~~~
a.cc:29:19: error: expected initializer before ';' token
   29 |         string str;
      |                   ^
a.cc:29:19: error: could not convert 'str' from 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'bool'
   29 |         string str;
      |                   ^
      |                   |
      |                   std::string {aka std::__cxx11::basic_string<char>}
a.cc:30:19: error: expected ')' before ';' token
   30 |         cin >> str;
      |                   ^
      |                   )
a.cc:24:13: note: to match this '('
   24 |         for each (auto  i in c)
      |             ^~~~
a.cc:32:29: error: 'str' was not declared in this scope; did you mean 'std'?
   32 |         for (int i = 0; i < str.length(); i++) {
      |                             ^~~
      |                             std
a.cc:36:13: error: expected '(' before 'each'
   36 |         for each (auto  i in dic)
      |             ^~~~
      |             (
a.cc:36:19: error: expected primary-expression before 'auto'
   36 |         for each (auto  i in dic)
      |                   ^~~~
a.cc:36:13: error: 'each' was not declared in this scope
   36 |         for each (auto  i in dic)
      |             ^~~~
a.cc:46:9: error: expected primary-expression before 'return'
   46 |         return 0;
      |         ^~~~~~
a.cc:44:32: error: expected ')' before 'return'
   44 |         cout << "None" << endl;
      |                                ^
      |                                )
   45 | 
   46 |         return 0;
      |         ~~~~~~                  
a.cc:36:13: note: to match this '('
   36 |         for each (auto  i in dic)
      |             ^~~~
Language: C++

#include<bits/stdc++.h>

using namespace std;
#define int1(a) scanf("%d",&a)
#define int2(a,b) scanf("%d %d",&a,&b)
#define int3(a,b,c) scanf("%d %d %d",&a,&b,&c)
#define int4(a,b,c,d) scanf("%d %d %d %d",&a,&b,&c,&d)
#define lint1(a) scanf("%lld",&a)
#define lint2(a,b) scanf("%lld %lld",&a,&b)
#define lint3(a,b,c) scanf("%lld %lld %lld",&a,&b,&c)
#define lint4(a,b,c,d) scanf("%lld %lld %lld %lld",&a,&b,&c,&d)
#define lli long long int
#define pint(x) printf("%d",x)
#define ps printf(" "); 
#define plint(x) printf("%lld",x)
//#define sort(a,n) qsort(a,n,sizeof(int),cmpfunc)
#define pb push_back
#define mp make_pair
#define mt make_tuple
#define bg begin()
#define ed end()
#define Set(a, s) memset(a, s, sizeof (a))
#define mod 1000000007
#define tmod(k) if ((k) >= mod) k %= mod;
#define endl '\n'
#define nl printf("\n");
#define fors(i,n) for(int i=0; i<n; i++)
#define fore(i,n) for(int i=n-1; i>=0; i--)
#define forv(i,a,n) for(int i=a; i<n; i++)
#define fora(i,ele) for(auto i: ele)
#define trace1(x)                cerr<<#x<<": "<<x<<endl
#define trace2(x, y)             cerr<<#x<<": "<<x<<" | "<<#y<<": "<<y<<endl
#define trace3(x, y, z)          cerr<<#x<<":" <<x<<" | "<<#y<<": "<<y<<" | "<<#z<<": "<<z<<endl
typedef string st;
typedef vector<int> vi;
typedef vector<st> vs;
const int INF = 0x3f3f3f3f;
int cmpfunc (const void * a, const void * b)
{
   return ( *(int*)a - *(int*)b );
}

class node{
public:
	int id;
	int prio;
	int prd;
};

class compare{
public:
	bool operator()(node &n1, node &n2){
		if(n1.prio>n2.prio)//ascending
			return true;
		else if(n1.prio==n2.prio){
			return n1.id>n2.id;
		}
		return false;
	}
};
//priority_queue<node, vector<node>, compare> pq;

int main(void) {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    /*#ifdef ONLINE_JUDGE
    freopen("input.txt","r",stdin);
    freopen("output.txt","w",stdout);
    #else
    // online submission
    #endif*/
    st str;
    cin>>str;
    sort(str.bg,str.ed);
    bool check = true;
    int a = 97;
    fors(i,str.length()){
        if(str[i]==a){
            continue;
        }
        else if(str[i]==a+1){
            a++;
        }
        else{
            check = false;
            break;
        }
    }
    if(a=='z'){
        printf("None");
    }
    else{
        printf("%c",a+1);
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:94:6: error: expected '}' at end of input
   94 |     }
      |      ^
a.cc:63:16: note: to match this '{'
   63 | int main(void) {
      |                ^
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
int main()
{
    char sh[27]="abcdefghijklmnopqrstuvwxyz",str[100005];
    int a[27]={0},i;
    gets(str);
    for(i=0;i<strlen(str);i++)
        a[str[i]-'\0'-97]++;
    for(i=0;i<26;i++)
    if(a[i]==0){printf("%c\n",i+97);break;}
    if(i==26)printf("None\n");
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   10 |     gets(str);
      |     ^~~~
      |     getw
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(void){
    string str;
    cin >> str;
    string alphabets("abcdefghijclmnopqrstuvwxyz");
    for(int i=0; i<alphabets.size(); i++){
        if(str.find(alphabets[i]) == string::npos){
            cout << alphabets[i];
    }
    cout << "None";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:2: error: expected '}' at end of input
   13 | }
      |  ^
a.cc:4:15: note: to match this '{'
    4 | int main(void){
      |               ^
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(void){
    string str;
    cin >> str;
    string alphabets("abcdefghijclmnopqrstuvwxyz");
    for(int i=0; i<alphabets.size(); i++){
        if(str.find(alphabets[i]) == string.npos){
            cout << alphabets[i];
    }
    cout << "None";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:44: error: expected primary-expression before '.' token
    9 |         if(str.find(alphabets[i]) == string.npos){
      |                                            ^
a.cc:13:2: error: expected '}' at end of input
   13 | }
      |  ^
a.cc:4:15: note: to match this '{'
    4 | int main(void){
      |               ^
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(void){
    string str;
    cin >> str;
    string alphabets("abcdefghijclmnopqrstuvwxyz");
    for(int i=0; i<alphabets.size(), i++){
        if(str.find(alphabets[i]) == string.npos){
            cout << alphabets[i];
    }
    cout << "None";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:41: error: expected ';' before ')' token
    8 |     for(int i=0; i<alphabets.size(), i++){
      |                                         ^
      |                                         ;
a.cc:9:44: error: expected primary-expression before '.' token
    9 |         if(str.find(alphabets[i]) == string.npos){
      |                                            ^
a.cc:13:2: error: expected '}' at end of input
   13 | }
      |  ^
a.cc:4:15: note: to match this '{'
    4 | int main(void){
      |               ^
Language: C++

#include <cstdio>
#include <iostream>
#include <cmath>
#include <algorithm>
#include <cstring>
using namespace std;
const int MXN = 100010;

char s[MXN];
int w[26] = {};
int main()
{
    gets(s);
    int n = strlen(s);
    for (int i = 0; i < n; ++i)
        ++w[s[i] - 'a'];
    for (int i = 0; i < 26; ++i) if (!w[i])
    {
        putchar('a' + i);
        return 0;
    }
    puts("None");
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   13 |     gets(s);
      |     ^~~~
      |     getw
Language: C++

#include <bits/stdc++.h>

 using namespace std;
string A;
bool a[26] = {};
  int main(){
  cin >> A;
  for(int i=0;i<A.size();i++){
  a[A[i]-'a'] = true;
}
for(i=0;i<26;i++){
 if(!a[i]) {
  cout << a[i] ;
  return 0;
} 
}
 printf("None");
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: 'i' was not declared in this scope
   11 | for(i=0;i<26;i++){
      |     ^
Language: C

#include<cstdio>
#include<string>

int alp[30];

int main()
{
	char s[105000];
	scanf("%s", s);

	for (int i = 0; i < strlen(s) ; i++) {
		alp[s[i] - 'a']++;
	}
	int ope = 0;
	for (int i = 0; i < 26; i++) {
		if (alp[i] == 0) {
			char b;
			b = 'a' + i;
			printf("%c\n", b);
			ope++;
			break;
		}
	}
	if (ope == 0)printf("None\n");

	return 0;
}


Compiler output:
main.c:1:9: fatal error: cstdio: No such file or directory
    1 | #include<cstdio>
      |         ^~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<string>

using namespace std;

int alp[30];

int main()
{
	char s[105000];
	scanf("%s", s);

	for (int i = 0; i < strlen(s) ; i++) {
		alp[s[i] - 'a']++;
	}
	int ope = 0;
	for (int i = 0; i < 26; i++) {
		if (alp[i] == 0) {
			char b;
			b = 'a' + i;
			printf("%c\n", b);
			ope++;
			break;
		}
	}
	if (ope == 0)cout << "None" << endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:29: error: 'strlen' was not declared in this scope
   16 |         for (int i = 0; i < strlen(s) ; i++) {
      |                             ^~~~~~
a.cc:5:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    4 | #include<algorithm>
  +++ |+#include <cstring>
    5 | #include<string>
Language: C++

#include<iostream>
using namespace std;
int main(){
	string s;
	cin>>s;
	for(char c='a';c<='z';c++){
		if(s.find(c)!=string.npos){
			cout<<c<<endl;
			return 0;
		}
	}
	cout<<"None"<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:37: error: expected primary-expression before '.' token
    7 |                 if(s.find(c)!=string.npos){
      |                                     ^
Language: C++

# include <bits/stdc++.h>
# define sz(x) (int)((x).size())
# define F first
# define S second
# define pb push_back
# define ub upper_bound
# define lb lower_bound
# define end(x) prev(x.end());
# define all(x) x.begin(), x.end()
# define pqueue priority_queue
# define mset multiset
# define umap unordered_map
# define Speed() ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
# define rep(i,n) for(int i=0;i<n;++i)
# define forn(i,n) for(int i=1;i<=n;++i)
# define lr(i,l,r) for(int i=l;(l>r?i>=r:i<=r);(l>r?--i:++i))

using namespace std;

template<class T> void umin(T &a, T b) { a = min(a, b); }
template<class T> void umax(T &a, T b) { a = max(a, b); }

typedef long long ll;
typedef pair<int, int> pii;

const int mod = 1e9+7;
const int N = 1e6+5;

int dp[N],a[105];

void solve(){
	ll n;
	cin>>n;
	map<ll,ll>m;
	pqueue<ll>q;
	ll ans=1;
	forn(i,n){
		ll x;
		cin>>x;
		m[x]++;
		if(m[x]==2 || m[x]==4){
			q.push(x);
		}
	}
	if(sz(q)>1){
		ans*=q.top();
		q.pop();
		ans*=q.top();
		cout<<ans;
	}
	else cout<<0;

}

int main(){
	Speed();
	int T=1; 
	//cin>>T;	
	while(T--)
		solve();
	return 0;
}
 75 



Compiler output:
a.cc:63:2: error: expected unqualified-id before numeric constant
   63 |  75
      |  ^~
Language: C++

#include "bits/stdc++.h"
using namespace std;

int main() {
	int N;
	cin >> N;
	map<int, int>mp;
	for (int i = 0; i < N; ++i) {
		int n;
		cin >> n;
		mp[n]++;
	}
	vector<int>A;
	int ans = 0;
	for (auto p : mp) {
		if (p.second>=2) {
			A.push_back[p.first];
		}
	}
	sort(A.rbegin,A.rend);
	if (A.size() >= 2) {
		ans = A[0] * A[1];
	}
	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:36: error: invalid types '<unresolved overloaded function type>[const int]' for array subscript
   17 |                         A.push_back[p.first];
      |                                    ^
a.cc:20:13: error: no matching function for call to 'sort(<unresolved overloaded function type>, <unresolved overloaded function type>)'
   20 |         sort(A.rbegin,A.rend);
      |         ~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algo.h:4762:5: note: candidate: 'template<class _RAIter> void std::sort(_RAIter, _RAIter)'
 4762 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4762:5: note:   template argument deduction/substitution failed:
a.cc:20:13: note:   couldn't deduce template parameter '_RAIter'
   20 |         sort(A.rbegin,A.rend);
      |         ~~~~^~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4793:5: note: candidate: 'template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)'
 4793 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4793:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator, class _Compare> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator, _Compare)'
  292 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note:   candidate expects 4 arguments, 2 provided
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator)'
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note:   candidate expects 3 arguments, 2 provided
Language: C++

#include <iostream>
using namespace std;

long long n, ans=0, a[100100], p,l,idx ;
int main() {
	cin >>n;
    for (int i=1; i<=n, i++){
        cin>>a[i]
    }
    sort(a+1, a+n+1):
    
    for (int i=n; i>=1;i--){
        if (a[i]==a[i-1]){
            p=a[i];
            idx=i;
            break;
        }
    }
    
    for (int i=idx-2; i>=1; i--){
        if (a[i]==a[i-1]){
            l=a[i];
            break;
        }
    }
    
    cout<<p*l<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:28: error: expected ';' before ')' token
    7 |     for (int i=1; i<=n, i++){
      |                            ^
      |                            ;
a.cc:8:18: error: expected ';' before '}' token
    8 |         cin>>a[i]
      |                  ^
      |                  ;
    9 |     }
      |     ~             
a.cc:10:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   10 |     sort(a+1, a+n+1):
      |     ^~~~
      |     short
a.cc:12:19: error: 'i' was not declared in this scope
   12 |     for (int i=n; i>=1;i--){
      |                   ^
Language: C++

#include <iostream>
#include <algorithm>
#define ll long long
using namespace std;
bool check[1000000009];
int n, arr[100005], x=1, ar[1000000005], pos[1000000009];
ll max1, max2, temp;
int main(){
    cin >> n;
    for(int i=1; i<=n; i++){
        cin >> arr[i];
        if(check[arr[i]]){
            ar[arr[i]]++;
        }
        else{
            pos[x]=arr[i];
            x++;
            ar[arr[i]]++;
        }
    }
    sort(pos+1, pos+x);
    ar[0]=2;
    for(int i=x-1; i>=0; i--){
        if(max2<pos[i] && ar[pos[i]]>1){
            max2=pos[i];
            if(max2>max1){
                temp=max2;
                max2=max1;
                max1=temp;
            }
        }
    }
    cout << max2*max1 << endl;
    return 0;
}

Compiler output:
/tmp/ccMF5TYL.o: in function `main':
a.cc:(.text+0xf1): relocation truncated to fit: R_X86_64_PC32 against symbol `pos' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x170): relocation truncated to fit: R_X86_64_PC32 against symbol `pos' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x17a): relocation truncated to fit: R_X86_64_PC32 against symbol `pos' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x1b4): relocation truncated to fit: R_X86_64_PC32 against symbol `pos' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x1c1): relocation truncated to fit: R_X86_64_PC32 against symbol `max2' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x1de): relocation truncated to fit: R_X86_64_PC32 against symbol `pos' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x20e): relocation truncated to fit: R_X86_64_PC32 against symbol `pos' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x21a): relocation truncated to fit: R_X86_64_PC32 against symbol `max2' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x221): relocation truncated to fit: R_X86_64_PC32 against symbol `max2' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x228): relocation truncated to fit: R_X86_64_PC32 against symbol `max1' defined in .bss section in /tmp/ccMF5TYL.o
a.cc:(.text+0x234): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
using ll = long long;
using P = pair<string,ll>;
const double PI = acos(-1);

ll main() {
  ll n;
  cin >> n;
  map<ll,ll> mp;
  rep(i,n){
    ll a;
    cin >> a;
    mp[a]++;
  }
  vector<ll> a;
  for(auto itr = mp.begin(); itr != mp.end(); itr++){
    if(itr->second > 1) a.push_back(itr->first);
  }
  if(a.size() < 2){
    cout << 0 << endl;
    return 0;
  }
  sort(a.begin(),a.end());
  reverse(a.begin(),a.end());
  ll ans = a.at(0)*a.at(1);
  cout << ans << endl;
}

Compiler output:
a.cc:8:1: error: '::main' must return 'int'
    8 | ll main() {
      | ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define int long long
typedef pair<int, int> ii;
typedef vector<int> vi;
typedef vector<ii> vii;
#define pb push_back
#define ld long double
#define f first
#define s second
#define in insert
#define sz(x) (int)x.size()
#define all(x) (x).begin(), (x).end()
#define speed ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
const int INF = 1e18 + 5;
const int mod = 1e9 + 7;
const int  N = 2e5 + 314;
const long double pi = 3.1415926535897932384626433832795;
void solve(){
	int n;
	cin>>n;
	vi v(n);
	map<int, int>cnt;
	for(int i = 0; i < n; i++){
		cin>>v[i];
		cnt[v[i]]++;
	}	
	sort(all(v));
	int i = n-1,a = -1, b = -1;
	while(i>=0)
	{
		if(cnt[v[i]]>1&&a==-1)a=v[i];
		if(v[i]!=a&&cnt[v[i]]>1&&b==-1)b=v[i];
		i--;
	}
	if(a==-1&&b==-1)cout<<"0\n";
	else if(a==-1||b==-1){
		if(a!=-1)cout<<a*a*(cnt[a]>3);
		else cout<<b*b*(cnt[b]>3);
	}
	else cout<<max(a*a*(cnt[a]>3), b*b*(cnt[b]>3), a*b);
}
signed main(){
	speed;
	int t=1;
	//cin>>t;
	while(t--)solve();
}

Compiler output:
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h: In instantiation of 'constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare) [with _Tp = long long int; _Compare = long long int]':
a.cc:41:16:   required from here
   41 |         else cout<<max(a*a*(cnt[a]>3), b*b*(cnt[b]>3), a*b);
      |                    ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:306:17: error: '__comp' cannot be used as a function
  306 |       if (__comp(__a, __b))
      |           ~~~~~~^~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long int i,n,sum=0,l;
    set<int>v;
    cin>>n;
    vector<long long int>p;
    for(i=0; i<n; i++)
    {
        cin>>l;
        p.push_back(l);
    }
    sort(p.begin(),p.end());
    reverse(p.begin(),p.end());
    for(i=0; i<n; i++)
    {
        if(count(p.begin(),p.end(),p[i])>=2)
        {
            v.insert(p[i]);
        }
        if(v.size()==2)
        {
            break;
        }
    }
    int u;
    if(v.size()==0)
    {
        cout<<"0"<<endl;
    }
    else
        for(u:v)
        {
            cout<<u*(u+1)<<endl;
            break;

        }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:33:14: error: found ':' in nested-name-specifier, expected '::'
   33 |         for(u:v)
      |              ^
      |              ::
a.cc:33:13: error: 'u' is not a class, namespace, or enumeration
   33 |         for(u:v)
      |             ^
a.cc:39:1: error: expected primary-expression before '}' token
   39 | }
      | ^
a.cc:38:10: error: expected ';' before '}' token
   38 |         }
      |          ^
      |          ;
   39 | }
      | ~         
a.cc:39:1: error: expected primary-expression before '}' token
   39 | }
      | ^
a.cc:38:10: error: expected ')' before '}' token
   38 |         }
      |          ^
      |          )
   39 | }
      | ~         
a.cc:33:12: note: to match this '('
   33 |         for(u:v)
      |            ^
a.cc:39:1: error: expected primary-expression before '}' token
   39 | }
      | ^
Language: C++

    #include<bits/stdc++.h>
    #define speed_up ios_base::sync_with_stdio(false); cin.tie(NULL)
    #define ll long long
    #define ara(A,N) sort(A,A+N)
    #define rev(A,N) sort(A,A+N,greater<long long>())
    using namespace std;
    int main()
    {
    long long int i,n,sum=0,l;
    set<int>v;
    cin>>n;
    vector<long long int>p;
    for(i=0;i<n;i++)
    {
        cin>>l;
        p.push_back(l);
    }
    sort(p.begin(),p.end());
    reverse(p.begin(),p.end());
    for(i=0;i<n;i++)
    {
        if(count(p.begin(),p.end(),p[i])>=2)
        {
            v.insert(p[i]);
        }
        if(v.size()==2)
        {
            break;
        }
    }
int u;
 if(v.size()==0)
 {
     cout<<"0"<<endl;
 }
 else
    for(u:v)
    {
        cout<<u*(u+1)<<endl;
        break;

    }
    }


Compiler output:
a.cc: In function 'int main()':
a.cc:37:10: error: found ':' in nested-name-specifier, expected '::'
   37 |     for(u:v)
      |          ^
      |          ::
a.cc:37:9: error: 'u' is not a class, namespace, or enumeration
   37 |     for(u:v)
      |         ^
a.cc:43:5: error: expected primary-expression before '}' token
   43 |     }
      |     ^
a.cc:42:6: error: expected ';' before '}' token
   42 |     }
      |      ^
      |      ;
   43 |     }
      |     ~ 
a.cc:43:5: error: expected primary-expression before '}' token
   43 |     }
      |     ^
a.cc:42:6: error: expected ')' before '}' token
   42 |     }
      |      ^
      |      )
   43 |     }
      |     ~ 
a.cc:37:8: note: to match this '('
   37 |     for(u:v)
      |        ^
a.cc:43:5: error: expected primary-expression before '}' token
   43 |     }
      |     ^
Language: C++

n=int(input())
a=list(map(int,input().split(' ')))
x=0
y=0
a.sort()
a.reverse()
for i in range(len(a)-1):
    if a[i]==a[i+1]:
        x=a[i]
        break
if x!=0:
    for i in range(len(a)-1):
        if a[i]!=x and a[i]==a[i+1]:
            y=a[i]
            break
print(x*y)

Compiler output:
a.cc:1:1: error: 'n' does not name a type
    1 | n=int(input())
      | ^
Language: C++

                                         //BISMILLAHIR RAHMANIR RAHIM
                                          //By the name of ALLAH
#include<iostream>
#include<algorithm>
#include<vector>
#include<set>
#include<iterator>
#include<numeric>
#define pi acos(-1.0)
using namespace std;
bool f(unsigned long long int x,unsigned long long int y)
{
    return x>y;
}
void solve()
{
    unsigned long long n,a[100000],i,j,p=0,q=0,s;
    cin>>n;
    for(i=0;i<n;i++){
        cin>>a[i];
    }
    sort(a,a+n,f);
    for(i=0;i<n;i++){
        if(a[i]==a[i+1]){
            p=a[i];
            break;
        }
    }
    for(j=i+1;j<n;j++){
        if(a[j]==a[j+1] && a[j]!=p){
            q=a[j];
            break;
        }
    }
    if(p<=0 || q<=0){
            s=1;
        for(int i=0;i<n;i++){
        if(a[i]==a[i+1])
            s++;
        else if(a[i]!==1){
            s=1;
        }
        if(s==4)
            break;
    }
    }
    if(p>0 && q>0)
    cout<<p*q<<endl;
    else
        if(s==4)
        cout<<s*s<<endl;

}
int main()
{
    solve();
    return 0;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:40:23: error: expected primary-expression before '=' token
   40 |         else if(a[i]!==1){
      |                       ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t,k;
    cin >> t;
    k=t;
    vector <int> side;
    long long n;
    while(k--)
    {
        cin >> n;
        side.push_back(n);
    }
    sort(side.begin(),side.end(),greater<long long >());
    int a=0,b=0,i,f=0;
    for(i=0;i<t-1;i++)
    {
        if(side[i]==side[i+1])
        {
            if(f==0){
                a=side[i];
                f++;
            }
            else if(f==1){
                b=side[i];
                f++;
            }
            i++;
        }
       // if(a>0 && b>0) break;
    }
    cout << a*b*1LL << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:33:29: error: expected '}' at end of input
   33 |     cout << a*b*1LL << endl;
      |                             ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    int t,k;
    cin >> t;
    k=t;
    vector <int> side;
    int n;
    while(k--)
    {
        cin >> n;
        side.push_back(n);
    }
    sort(side.begin(),side.end(),greater<int >());
    int a=0,b=0,i,f=0;
    for(i=0;i<t-1;i++)
    {
        if(side[i]==side[i+1])
        {
            if(f==0){
                a=side[i];
                f++;
            }
            else if(f==1){
                b=side[i];
                f++;
            }
            i++;
        }
       // if(a>0 && b>0) break;
    }
    cout << a*b*1LL << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:33:29: error: expected '}' at end of input
   33 |     cout << a*b*1LL << endl;
      |                             ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
#define pii pair<int,int>
#define piii pair<int,pii>
#define pll pair<ll,ll>
#define plii pair<ll,pii>
#define vi vector<int>
#define ff first
#define ss second
#define mp make_pair
#define pb push_back
#define SORT(x) sort(x.begin(), x.end())
#define GSORT(x) sort(x.begin(), x.end(), greater<int>())
#define mx 100001
#define eps 0.00000000001
#define mod 1000000007
#define pi acos(-1)
#define inf 100000000
#define loop(i,b,n) for(int i=b;i<n;++i)
#define rev_loop(i,b,n) for(int i=b;i>=n;--i)
#define fio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
using namespace std;
int main()
{
    fio;
    int n;
    cin>>n;
    vector<ll> v1;
    ll a1;
    map<ll,ll> m1;
    loop(i,0,n)
    {
        cin>>a1;
        m1[a1]++;
    }
    vector<ll> v2;
       map<ll, ll>::iterator it;
   for(it = m1.begin();it!=m1.end();it++)
   {
       if(it->ss>=4){
        v2.pb(it->ff);
        v1.pb(it->ff);}
       else if(it->ss>=2)
        v1.pb(it->ff);
   }
   GSORT(v1);
   GSORT(v2);
   if(v1.size()<2 )
   {
       if(v2.size()<1)
       cout<<"-1\n";
   else{
    k = v2[0];
        cout<<k*k<<endl;
   }
   }
   else{
       ll k = 0;
        if(v2.size()>0)
    k = v2[0];
    ll r = v1[0];
    if(k==r)
        cout<<k*k<<endl;
    else
    {
        cout<<v1[0]*v1[1]<<endl;
    }
   }
    
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:54:5: error: 'k' was not declared in this scope
   54 |     k = v2[0];
      |     ^
Language: C++

#include<bits\stdc++.h>
#define int long long
#define endl '\n'
#define fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
#define line cout<<"here - "<<__LINE__<<"\n";
#define dbg(a) cout<<#a<<" --> "<<(a)<<"\n";
#define infi INT_MAX
#define rinfi INT_MIN
#define inf LLONG_MAX
#define rinf LLONG_MIN
#define ff first
#define ss second
using namespace std;
main()
{
    fast
    int tc=1,i,j,k;
//    cin>>tc;
    while(tc--)
    {
       int a;
       cin>>a;
       int aa[a];
       map<int,int>mp;
       for(i=0;i<a;i++)
        cin>>aa[i],mp[aa[i]]++;
        sort(aa,aa+a);
        vector<int>tmp;
        for(i=a-1;i>=0;i--)
        {
            if(mp[aa[i]]>=2)
            {
                tmp.push_back(aa[i]);
                mp[aa[i]]=0;
            }
        }
        if(tmp.size()<2)
            cout<<0<<endl;
        else cout<<tmp[0]*tmp[1]<<endl;

    }

}




Compiler output:
a.cc:1:9: fatal error: bits\stdc++.h: No such file or directory
    1 | #include<bits\stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
int a[100100], i, n, temp;
pair<int,int>P;
int main()
{
    cin >> n;
    for(i=0;i<n;i++)
        cin >> a[i];
    sort(a, a+n)
    P.first = 0;
    P.second = 0;
    for(i=0;i<n-1;i++)
    {
        if(a[i]==a[i+1])
        {
            temp = P.second;
            P.second = a[i];
            P.first = temp;
            i++;
        }
    }
    cout << P.first*P.second << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:17: error: expected ';' before 'P'
   10 |     sort(a, a+n)
      |                 ^
      |                 ;
   11 |     P.first = 0;
      |     ~
Language: C++

n=int(input())
A=list(map(int,input().split()))
k=max(A)+1

count=[0]*k
for i in range(n):
  count[A[i]]+=1

height=0
width=0

for i in range(k-1,0,-1):
  if (height==0 and width==0 and count[i]>=4):
    height=i
    width=i
    break
  elif (height==0 and width==0 and count[i]>=2):
    height=i
    continue
  elif (height!=0 and count[i]>=2):
    width=i
    break
    
print(height*width)

Compiler output:
a.cc:1:1: error: 'n' does not name a type
    1 | n=int(input())
      | ^
Language: C++

#include <iostream>
#include <algorithm>
using namespace std;

int main() {
	int n;
	cin>>n;
	int arr[n];
	for (int i=0; i<n; i++){
		cin >> arr[i];
	}
	sort (arr, arr+n);
	int h = 0;
    int w = 0
	int x = arr[n-1];
	int side = 1;
	int cnt = 0;
	for (int i=n-2; i>0; i--){
		//cout << x << " " <<arr[i] << endl;
		if (x == arr[i]==arr[i=1]==arr[i-2]){
			cout << x*x << endl;
			return 0;
		}
		if (arr[i]==x and arr[i-1]!=x){
			side*=x;
			x = arr[i];
			cnt++;
			if (cnt==2){
				cout << side<< endl;
				return 0;
			}
		}
		else {
			x = arr[i];
		}
	}
	cout << 0 << endl;
}

//sort 之後取最大最後面的兩個以上的連續數字相乘
//但如果有連續4個數字一樣, 則取這個數字相乘得到正方形





Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: expected ',' or ';' before 'int'
   15 |         int x = arr[n-1];
      |         ^~~
a.cc:20:21: error: 'x' was not declared in this scope
   20 |                 if (x == arr[i]==arr[i=1]==arr[i-2]){
      |                     ^
a.cc:24:29: error: 'x' was not declared in this scope
   24 |                 if (arr[i]==x and arr[i-1]!=x){
      |                             ^
Language: C++

#include <bits/stdc++.h>
using namespace std;

#define ll long long
#define pb push_back
#define vi vector<int>
#define FOR(i, a, b) for(int i = a; i < b; i++)
#define sizeOf(A) (sizeof(A))/(sizeof(A[0]))
#define odd(x) ((x) % (2))
#define fastio ios_base::sync_with_stdio(false), cin.tie(0);
const ll MOD = 1e9 + 7;

int main() {
    fastio;

    int n;
    cin >> n;
    ll A[n];
    FOR(i, 0, n) {cin >> A[i];}
    sort(A, A + n);
    reverse(A, A + size);
    vector<ll> duplicates;
    FOR(i, 0, n-1) {
        if (A[i] == A[i+1]) {
            duplicates.pb(A[i]);
            i++;
        }
    }
    if (duplicates.size() < 2) {
        cout << 0 << "\n"; 
    } else {
        cout << duplicates[0]*duplicates[1] << "\n";
    }
    return 0;
}
 

Compiler output:
a.cc: In function 'int main()':
a.cc:21:18: error: invalid operands of types 'long long int [n]' and '<unresolved overloaded function type>' to binary 'operator+'
   21 |     reverse(A, A + size);
      |                ~~^~~~~~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0;i < (n);i++)
using namespace std;
using ll = long long;
using pii = pair<int,int>;

int main(){
    int n;
    cin >> n;
    map<ll,int> mp;
    vector<ll> a(n);
    rep(i,n)cin >> a[i];
    ll x = -1,y = 0;
    sort(a.begin(),a.end);
    rep(i,n-1){
        if(a[i] != a[i+1]) continue;
        if(x == -1){
            x = a[i];
            i++;
        }
        else{
            y = a[i];
            break;
        }
    }
    ll ans = x*y;
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: no matching function for call to 'sort(std::vector<long long int>::iterator, <unresolved overloaded function type>)'
   14 |     sort(a.begin(),a.end);
      |     ~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algo.h:4762:5: note: candidate: 'void std::sort(_RAIter, _RAIter) [with _RAIter = __gnu_cxx::__normal_iterator<long long int*, vector<long long int> >]'
 4762 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4762:63: note:   no known conversion for argument 2 from '<unresolved overloaded function type>' to '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >'
 4762 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |                                         ~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/usr/include/c++/14/bits/stl_algo.h:4793:5: note: candidate: 'template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)'
 4793 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4793:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator, class _Compare> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator, _Compare)'
  292 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note:   candidate expects 4 arguments, 2 provided
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator)'
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note:   candidate expects 3 arguments, 2 provided
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)

 
int main() {
    int n;
    cin>>n;

    //mapのソートは宣言時に
    map<ll,ll,greater<ll>> A;
    rep(i,n){
        ll a;
        cin>>a;
        A[a]++;
    }

    vector<ll> tateyoko(1);
    //0で初期化されているのでpush_backはダメか？
    for(auto p:A){
        if(p.second>=4){
            tateyoko.push_back(p.first);
            tateyoko.push_back(p.first);
        }
        if(p.second>=2) tateyoko.push_back(p.first);
    }

    if(tateyoko.length()>=3)cout<<tateyoko[1]*tateyoko[2]<<endl;
    else cout<<0<<endl;

}

//pushbackの使い方(0に上書き不可)

Compiler output:
a.cc: In function 'int main()':
a.cc:29:17: error: 'class std::vector<long long int>' has no member named 'length'
   29 |     if(tateyoko.length()>=3)cout<<tateyoko[1]*tateyoko[2]<<endl;
      |                 ^~~~~~
Language: C++

#include <bits/stdc++.h>
#define rep(i, n) for(int i = 0; i < n; ++i)
#define rrep(i, n) for(int i = n-1; i >= 0; --i)
using namespace std;

int main(){
  long long a = 0; int n; scanf("%d", &n);
  map<int, int> m;
  rep(i, n){
    int a; scanf("%d", %a);
    m[a]++;
  }
  priority_queue<int> p;
  for(auto q: m) if(m[q.second] > 1) p.push(q.first);
  if(p.size() > 1){
    a = p.top(); p.pop(); a *= p.top();
  }
  printf("%ld\n", a);
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: expected primary-expression before '%' token
   10 |     int a; scanf("%d", %a);
      |                        ^
Language: C++

#include<bits/stdc++.h>
#define all(x) (x).begin(),(x).end()
#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
using namespace std;
typedef long long ll;
ll gcd(ll a,ll b){return b!=0?gcd(b,a%b):a;}
ll lcm(ll a,ll b){return a/gcd(a,b)*b;}

int main(){
    ll n,a;
    cin>>n
    map<ll,ll> mp;
    rep(i,n){
        cin>>a;
        mp[-a]++;
    }
    ll h=0,w=0;
    for(auto x:mp){
        if(x.second>=2){
            if(h==0) h=-x.first;
            else{
                w=-x.first;
                break;
            }
        }
    }
    cout<<h*w<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: expected ';' before 'map'
   11 |     cin>>n
      |           ^
      |           ;
   12 |     map<ll,ll> mp;
      |     ~~~    
a.cc:15:9: error: 'mp' was not declared in this scope
   15 |         mp[-a]++;
      |         ^~
a.cc:18:16: error: 'mp' was not declared in this scope
   18 |     for(auto x:mp){
      |                ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;


#define f(i,a,b) for(int i=(int)(a);i<=(int)(b);i++)
#define char_f(i,a) for(int i=(int)(a);(char)s[i]!='\0';i++)
#define rf(i,a,b) for(int i=(int)(a);i>=(int)(b);i--)
#define llf(i,a,b) for(long long int i=(long long int)(a);i<=(long long int)(b);i++)
#define llrf(i,a,b) for(long long int i=(long long int)(a);i>=(long long int)(b);i--)



#define ll long long
#define fi first
#define se second
#define pb push_back
#define pop pop_back
#define mem(ara) memset((ara),0,sizeof(ara))
#define memn(ara) memset((ara),-1,sizeof(ara))
#define bb begin()
#define ee end()
#define em emplace
#define eb emplace_back





#define si set<int>
#define sd set<double>
#define sll set<long long int>
#define ss set<string>
#define sc set<char>

#define pii pair<int,int>
#define pli pair<long long int,int>
#define pil pair<int,long long int>
#define pll pair<long long int,long long int>
#define pci pair<char,int>
#define pic pair<int,char>
#define pcl pair<char,long long int>
#define plc pair<long long int,char>

#define pss pair<string,string>
#define pcc pair<char,char>

#define pis pair<int,string>
#define psi pair<string,int>
#define pls pair<long long int,string>
#define psl pair<string,long long int>
#define pdd pair<double,double>
#define pcs pair<char,string>
#define psc pair<string,char>



#define vi  vector<int>
#define vll vector<long long int>
#define vd vector<double>
#define vs vector<string>
#define vc vector<char>
#define vii vector<pii>



#define mod 1000000007
#define mx (1<<30)-1
#define llmx (1ll<<62)
#define n_size 100005
#define g_size 10000005
double PI=acos(-1);



///unsigned int uMAX=4294967295;
///unsigned ll int ullMAX=18446744073709551615;





ll int arr[g_size];



int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(nullptr);
	cout.tie(nullptr);

	ll int n,m,T,res;

    ll int maxi=-mx,mini=mx,y=0,x,a=0;

	ll int i,j=-1,k;

	bool flag;

	string s1,s2;

	char s[100000];

	ll int ara[n_size],ara2[n_size];

	cin>>n;

	vl vec,v;


	f(i,0,n-1){
        cin>>m;
        vec.pb(m);
	}

    sort(vec.bb,vec.ee,greater<>());

//    f(i,0,n-1) cout<<vec[i]<<" ";
//    cout<<endl;

    res=0;
    x=1;
    y=0;
    a=0;

    f(i,1,n-1)
    {
        if(vec[i]==vec[i-1]){

            y++;

            if(y==3){
                cout<<arr[1]*arr[1]<<endl,exit(0);
            }

            if(arr[x-1]!=vec[i]){
                arr[x]=vec[i];
                x++;

                if(x==3) {
                    cout<<arr[1]*arr[2]<<endl,exit(0);
                }
            }

        }
        else y=0;
    }

    cout<<0<<endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:108:9: error: 'vl' was not declared in this scope; did you mean 'vc'?
  108 |         vl vec,v;
      |         ^~
      |         vc
a.cc:113:9: error: 'vec' was not declared in this scope; did you mean 'vc'?
  113 |         vec.pb(m);
      |         ^~~
      |         vc
a.cc:116:10: error: 'vec' was not declared in this scope; did you mean 'vc'?
  116 |     sort(vec.bb,vec.ee,greater<>());
      |          ^~~
      |          vc
Language: C++

#include <bits/stdc++.h>
using  namespace std;
#define    ll  long long int
int main( )
{
    int n, i, x, k, mx = -1;
    map<int, int> mp;
    vector<int> v;
    cin >> n;
    for (i = 1; i <= n; i++)
    {
        cin >> x;
        mp[x]++;
        if (mp[x] == 2)
        {
            v.push_back(x);
            mp[x] = 0;
        }
    }
    sort(v.begin(), v.end());
    sz=  v.size();
    if (sz < 2)
    {
        cout << "0\n";
    }
    else
    {
        cout << ( (ll) v[sz - 1] * v[sz - 2]) << endl;
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:5: error: 'sz' was not declared in this scope
   21 |     sz=  v.size();
      |     ^~
Language: C

#include<stdio.h>
#include<vector>
#include<set>
#include<algorithm>
using namespace std;
set<long long>k,v;
vector<long long>t;
int main()
{
    long long a,h,siz,p,q;
    scanf("%lld",&a);
    for(long long i=0;i<a;i++)
    {
        siz=k.size();
        scanf("%lld",&h);
        k.insert(h);
        if(k.size()==siz)
        {
            v.insert(h);
            t.push_back(h);
        }
    }
    sort(t.begin(),t.end());
    p=*v.rbegin();
    if(v.size()>1&&count(t.begin(),t.end(),p)<3)
    {
    v.erase(p);
    q=*v.rbegin();
    printf("%lld",p*q);
    }
    else if(count(t.begin(),t.end(),p)>=3) printf("%lld",p*p);
    else printf("0");

 
    return 0;
}


Compiler output:
main.c:2:9: fatal error: vector: No such file or directory
    2 | #include<vector>
      |         ^~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>
#include<vector>
#include<set>
#include<algorithm>
using namespace std;
set<long long>k,v;
vector<long long>t;
int main()
{
    long long a,h,siz,p,q;
    scanf("%lld",&a);
    for(long long i=0;i<a;i++)
    {
        siz=k.size();
        scanf("%lld",&h);
        k.insert(h);
        if(k.size()==siz)
        {
            v.insert(h);
            t.push_back(h);
        }
    }
    sort(t.begin(),t.end());
    p=*v.rbegin();
    if(v.size()>1&&count(t.begin(),t.end(),p)<3)
    {
    v.erase(p);
    q=*v.rbegin();
    printf("%lld",p*q);
    }
    else if(count(t.begin(),t.end(),p)>=3) printf("%lld",p*p);
    else printf("0");

 /*   k.insert(1);
    k.insert(2);
    k.insert(55);
    k.insert(54);
    if(!k.empty())
        printf("%d",*k.rbegin());*/
/*    t.push_back(3);
     t.push_back(3);
      t.push_back(4);
      printf("%d",count(t.begin(),t.end(),3));*/
    return 0;
}


Compiler output:
main.c:2:9: fatal error: vector: No such file or directory
    2 | #include<vector>
      |         ^~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;

int main(){
    map<long long,int> m;
    map<long long,int> ::reverse_iterator i;
    int a=0;
    long long n,x;
    long long *c;
    long long h[2]={};

    scanf("%lld",&n);

    for(int i=0;i<n;i++){
        scanf("%lld",&x);
        m[x]++;
    }

    for(i = m.rbegin(); i!= m.rend(); i++){
        if(i->second >=4 && a=0){
            h[0]=h[1]= i->first;
            break;
        }
        if(i->second >=2){
            i->second -= 2;
            h[a] = i->first;
            a++;
            if(a==2) break;
        }
        //cout << m[x] << " " << x <<" " << h[a] << ":" << a << endl;
    }
    printf("%lld",h[0]*h[1]*1ll);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:26: error: lvalue required as left operand of assignment
   20 |         if(i->second >=4 && a=0){
      |            ~~~~~~~~~~~~~~^~~~