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

#include <bits/stdc++.h>

typedef long long ll;

int main(){
	std::ios::sync_with_stdio(false);

	ll n;
	std::cin >> n;

	for(ll i = 0; i < n; i++){
		std::cin >> val[i];
	}
	std::sort(val, val + n);

	ll a = 0;
	ll b = 0;

	for(ll i = n - 1; i >= 0; i--){
		if(val[i] == val[i - 1]){
			if(val[i] > a){
				b = a;
				a = val[i];
			} else if(val[i] > b){
				b = val[i];
			}

			i--;
		}
	}

	std::cout << a * b << '\n';
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:29: error: 'val' was not declared in this scope
   12 |                 std::cin >> val[i];
      |                             ^~~
a.cc:14:19: error: 'val' was not declared in this scope
   14 |         std::sort(val, val + n);
      |                   ^~~
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
	long long n;
	cin>>n;
	__int64 a[100005];
	for(int i=0;i<n;i++)
	cin>>a[i];
	sort(a,a+n);
	__int64 flag=0;
	__int64 c=0,b=0;
	for(int i=n-1;i>=0;i--)
	{    
         if(flag==0)
         {
         	if(a[i]==a[i-1])
         	{
	         	c=a[i];
	         	flag++;
            }
         }
         else if(flag==1)
         {
         	if(a[i]==a[i-1]&&a[i]!=c)
         	{
	         	b=a[i];
	         	flag++;
            }
         }
         else
         break;		
	}
	printf("%I64d\n",b*c);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
    8 |         __int64 a[100005];
      |         ^~~~~~~
      |         __int64_t
a.cc:10:14: error: 'a' was not declared in this scope
   10 |         cin>>a[i];
      |              ^
a.cc:11:14: error: 'a' was not declared in this scope
   11 |         sort(a,a+n);
      |              ^
a.cc:12:16: error: expected ';' before 'flag'
   12 |         __int64 flag=0;
      |                ^~~~~
      |                ;
a.cc:13:16: error: expected ';' before 'c'
   13 |         __int64 c=0,b=0;
      |                ^~
      |                ;
a.cc:16:13: error: 'flag' was not declared in this scope
   16 |          if(flag==0)
      |             ^~~~
a.cc:20:25: error: 'c' was not declared in this scope
   20 |                         c=a[i];
      |                         ^
a.cc:26:40: error: 'c' was not declared in this scope
   26 |                 if(a[i]==a[i-1]&&a[i]!=c)
      |                                        ^
a.cc:28:25: error: 'b' was not declared in this scope
   28 |                         b=a[i];
      |                         ^
a.cc:35:26: error: 'b' was not declared in this scope
   35 |         printf("%I64d\n",b*c);
      |                          ^
a.cc:35:28: error: 'c' was not declared in this scope
   35 |         printf("%I64d\n",b*c);
      |                            ^
Language: C++

#include <stdio.h>
#include <algorithm>
#include <unordered_map>
using namespace std;
using ll = long long;
struct Int2
{
	int x, y;
	Int2(int x, int y):x(x),y(y){}
	bool operator<(const Int2& other) const {
		if (x != other.x)
			return x < other.x;
		return y < other.y;
	}
	bool operator>(const Int2& other) const {
		if (x != other.x)
			return x > other.x;
		return y > other.y;
	}
};
int main() {
	int n, a;
	unordered_map<int, int> m;
	scanf("%d", &n);
	for (int i = 0; i < n; i++) {
		scanf("%d", &a);
		m[a]++;
	}
	vector<Int2> v;
	for (auto itr = m.begin(); itr != m.end(); ++itr) {
		if (itr->second < 2)
			continue;
		v.emplace_back(itr->first, itr->second);
	}

	if (v.size() == 0 || (v.size() == 1 && v.front().y < 4)) {
		printf("%d\n", 0);
		return 0;
	}
	sort(v.begin(), v.end());
	if (4 <= v.back().y)
		printf("%lld\n", ((ll)v.back().x) * ((ll)v.back().x));
	else
		printf("%lld\n", ((ll)v[v.size() - 1].x) * ((ll)v[v.size() - 2].x));
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:9: error: 'vector' was not declared in this scope
   29 |         vector<Int2> v;
      |         ^~~~~~
a.cc:4:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    3 | #include <unordered_map>
  +++ |+#include <vector>
    4 | using namespace std;
a.cc:29:20: error: expected primary-expression before '>' token
   29 |         vector<Int2> v;
      |                    ^
a.cc:29:22: error: 'v' was not declared in this scope
   29 |         vector<Int2> v;
      |                      ^
Language: C++

#include <iostream>

using namespace std;

int main()
{
  int N;
  cin >> N;
  int A[N];
  int i;
  for (i=0;i<N;i++) cin >> A[i];
  sort(A,A+N,greater<int>());
  int j=0;
  while (j<N & A[j]!=A[j+1]) j+=1;
  int p = A[j];
  j=j+2;
  while (j<N & A[j]!=A[j+1]) j+=1;
  int q = A[j];
  if (j >= N) cout << 0 << endl;
  else cout << p*q << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |   sort(A,A+N,greater<int>());
      |   ^~~~
      |   short
Language: C++

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

_int64 a[10010];
int main()
{
	int n,i,tempa,tempb,k;
	while(cin>>n){
		tempa=0;
		tempb=0;
		for(i=0;i<n;i++)
			cin>>a[i];
		sort(a,a+n);
		for(i=n-1;i>=1;i--)
			if(a[i]==a[i-1])
			{
				tempa=a[i];
				k=i-1;
				break;
			}
		for(i=k-1;i>=1;i--)
			if(a[i]==a[i-1])
			{
				tempb=a[i];
				break;
			}
		cout<<tempa*tempb<<endl;
	}
	return 0;
}

Compiler output:
a.cc:6:1: error: '_int64' does not name a type
    6 | _int64 a[10010];
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:14:30: error: 'a' was not declared in this scope
   14 |                         cin>>a[i];
      |                              ^
a.cc:15:22: error: 'a' was not declared in this scope
   15 |                 sort(a,a+n);
      |                      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
map<int,int>mp;
int main(){
	//freopen("readin.txt","r",stdin);
	int n;
	scanf("%d",&n);
	while(n--){
		int a;
		scanf("%d",&a);
		mp[a]++;
	}
	int ans = 0,count = 0;
	int one = -1,two = -1;
	for(mp<int,int>::iterator i = mp.begin();i != mp.end();i++){
		if(i->second >= 2)one = i->first;
	}
	if(one == -1)return puts("0"),0;
	mp[one]-=2;
	for(mp<int,int>::iterator i = mp.begin();i != mp.end();i++){
		if(i->second >= 2)two = i->first;
	}
	if(two == -1)return puts("0"),0;
	cout << (long long)one*two << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:16: error: expected primary-expression before 'int'
   15 |         for(mp<int,int>::iterator i = mp.begin();i != mp.end();i++){
      |                ^~~
a.cc:15:50: error: 'i' was not declared in this scope
   15 |         for(mp<int,int>::iterator i = mp.begin();i != mp.end();i++){
      |                                                  ^
a.cc:20:16: error: expected primary-expression before 'int'
   20 |         for(mp<int,int>::iterator i = mp.begin();i != mp.end();i++){
      |                ^~~
a.cc:20:50: error: 'i' was not declared in this scope
   20 |         for(mp<int,int>::iterator i = mp.begin();i != mp.end();i++){
      |                                                  ^
Language: Java

import java.util.*;
public class Main {
	public static void main(String...args) {
      	final Scanner sc = new Scanner(Sysytem.in);
      	final int N = sc.nextInt();
      	final int[] A = new int[N];
      	for(int i = 0; i < N; i++)
        	A[i] = sc.nextInt();
      	Arrays.sort(A);
      	long longer = 0;
      	for(int i = N - 1, p = -1; i >= 0; i--)
        	if(p == A[i]) {
            	if(longer > 0) {
                	System.out.println(longer * p);
                  	return;
                } else {
                	longer = p;
                  	p = -1;
                }
            } else
              	p = A[i];
      	System.out.println(0);
    }
}

Compiler output:
Main.java:4: error: cannot find symbol
      	final Scanner sc = new Scanner(Sysytem.in);
      	                               ^
  symbol:   variable Sysytem
  location: class Main
1 error
Language: C++

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

int main() {
	int n;
	scanf("%d", &n);
	map<int, int> mp;
	for (int i=0; i<n; i++) {
		int a;
		scanf("%d", &a);
		if (mp.find(-a)==mp.end()) {
			mp.insert({-a,1});
		}
		else mp[-a]++;
	}
	long long a1=0, a2=0;
	for (auto it=mp.begin(); it!=mp.end(); it++) {
		if (it->second>=4) {
			a1=max(a1,it->first);
			a2=it->first;
			break;
		}
		if (it->second>=2) {
			if (a1==0) a1=it->first;
			else if (a2==0) {
				a2=it->first;
				break;
			}
		}
	}
	printf("%lld\n", a1*a2);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:31: error: no matching function for call to 'max(long long int&, const int&)'
   19 |                         a1=max(a1,it->first);
      |                            ~~~^~~~~~~~~~~~~~
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:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:19:31: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   19 |                         a1=max(a1,it->first);
      |                            ~~~^~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:19:31: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   19 |                         a1=max(a1,it->first);
      |                            ~~~^~~~~~~~~~~~~~
Language: C++


#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <queue>
#include <map>
#include <unordered_map>
#include <set>
using namespace std;

typedef long long ll;

int n;
int a[100002] = { 0 };

int main() {
	cin >> n;
	int w;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	sort(a, a + n);
	bool flag = false;
	int f = 0, s = 1;
	for (int i = 1; i < n; i++) {
		if (a[i - 1] == a[i]) {
			if (a[i] != s) {
				f = s;
				s = a[i];
			}
		}
	}
	cout << f*s << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:9: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   23 |         sort(a, a + n);
      |         ^~~~
      |         sqrt
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define ull unsigned long long
using namespace std;

const int N = 200005;

int main()
{
	int i, n, t;
	__int64 ans = 0;
	scanf("%d", &n);
	map<int, int> x;
	for (i = 0; i < n; i++)
	{
		scanf("%d", &t);
		x[t]++;
	}
	bool have = false;
	for(auto it = x.rbegin(); it != x.rend(); it++)
	{
		if (!have && it->second >= 4)
		{
			ans = it->first;
			ans = ans*it->first;
			break;
		}
		else if (!have && it->second >=2)
		{
			ans = it->first;
			have = true;
		}
		else if (have && it->second>=2)
		{
			ans = ans*it->first;
			break;
		}
	}
	printf("%I64d\n", ans);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: '__int64' was not declared in this scope; did you mean '__ynf64'?
   11 |         __int64 ans = 0;
      |         ^~~~~~~
      |         __ynf64
a.cc:24:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   24 |                         ans = it->first;
      |                         ^~~
      |                         abs
a.cc:30:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   30 |                         ans = it->first;
      |                         ^~~
      |                         abs
a.cc:35:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   35 |                         ans = ans*it->first;
      |                         ^~~
      |                         abs
a.cc:39:27: error: 'ans' was not declared in this scope; did you mean 'abs'?
   39 |         printf("%I64d\n", ans);
      |                           ^~~
      |                           abs
Language: C++

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

using namespace std;

int main(){
  int N;
  int a[200000];

  cin >> N;
  for(int i = 0; i < N; i++){
    cin >> a[i];
  }

  sort(a, a+N);

  ll x[2];
  int y = 0;
  for(int i = N-1; i > 0; i--){
    if(y == 2)  break;
    if(a[i] == a[i-1]){
      x[y] = a[i];
      i--;
      y++;
    }
  }

  if(y == 2){
    cout << x[0] * x[1] << endl;
  }
  else cout << 0 << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:3: error: 'll' was not declared in this scope
   20 |   ll x[2];
      |   ^~
a.cc:25:7: error: 'x' was not declared in this scope
   25 |       x[y] = a[i];
      |       ^
a.cc:32:13: error: 'x' was not declared in this scope
   32 |     cout << x[0] * x[1] << endl;
      |             ^
Language: C++

#include <bits/stdc++.h>
    #include<string.h>
    using namespace std;
    #define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    #define endl "\n"
    #define Max(x,y,z) max(x,max(y,z))
    #define Min(x,y,z) min(x,min(y,z))
    #define fr(i,s,e) for(i=s;i<e;i++)
    #define rf(i,s,e) for(i=s-1;i>=e;i--)
    #define pb push_back
    #define eb emblace_back
    #define mp make_pair
    #define ff first
    #define ss second
    #define ll long long
    #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
    #define trace4(a, b, c, d)       cerr<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<endl
    #define trace5(a, b, c, d, e)    cerr<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<" | "<<#e<< ": "<<e<<endl
    #define trace6(a, b, c, d, e, f) cerr<<#a<<": "<<a<<" | "<<#b<<": "<<b<<" | "<<#c<<": "<<c<<" | "<<#d<<": "<<d<<" | "<<#e<< ": "<<e<<" | "<<#f<<": "<<f<<endl
    #define vl vector<long long>
     
    #define vi vector<int> 
    #define vii vector< vector<int> >
	#define viii vector<vector<vector<int> > > 
    #define vll vector< vector<long long> >
    #define vpi vector< pair<int,int> >   
    #define vpl vector< pair<ll,ll> >   
    typedef pair<pair<int, int>,int> P;
     #define mod %1000000007
     //#define p 41
    bool less_vectors(const vector<int>& a,const vector<int>& b) 
    {
       return a.size() > b.size();
    }
     
    ll gcd(ll a,ll b)
	{
	if(a%b==0)
		return b;
		else
			return gcd(b,a%b);
	}
	bool cmp(pair<char,int> p1,pair<char,int>  p2)
    {
		if(p1.ff!=p2.ff)
    		return p1.ff>p2.ff;
			else
				return p1.ss<p2.ss;
    }
	ll fastexpo(ll a,ll b)
	{
		//trace2(a,b);
    	ll res=1;
    	while(b>0)
    	{
    		if(b%2==1)
    			res=(((res)mod)*((a)mod))mod;
    		a=(((a)mod)*((a)mod))mod;
    		b/=2;
    	}
		//trace1(res);
    	return res;
	}
	ll fastexpom(ll a,ll b,ll m)
	{
	ll res=1;
    	while(b>0)
    	{
    		if(b%2==1)
    			res=(((res)%m)*((a)%m))%m;
    		a=(((a)%m)*((a)%m))%m;
    		b/=2;
    	}
    	return res;
	}
	ll modinv(ll a,ll m)
	{
	return fastexpom(a,m-2,m);
	}
int main()
{
	IOS;
	int n;
	cin>>n;
	vl v(n);
	for(int i=0;i<n;i++)
		cin>>v[i];
	sort(v.begin(),v.end());
	ll a=-1;
	ll b=-1;
	for(int i=n-2;i>=0;i--)
	{
		if(v[i]==v[i-1])
		{
			if(a==-1)
				{a=v[i];
				i--
				}
				else
					if(b==-1)
					{
						b=v[i];
						break;
					}
		}
	}
	ll ans=0;
	
	ans=max(ans,a*b);
	if(a==-1 || b==-1)
		ans=0;
	cout<<ans;
	return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:99:36: error: expected ';' before '}' token
   99 |                                 i--
      |                                    ^
      |                                    ;
  100 |                                 }
      |                                 ~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;
typedef long long ll;

int n;
vector<ll> a;

int main() {
        cin >> n;
        a = vector<int>(n);
        for (int i=0; i<n; ++i)
                cin >> a[i];

        sort(a.begin(),a.end());

        ll one=0;
        ll two=0;
        for (int i=a.size()-1; i>=0; i--) {
                if (a[i] == a[i-1]) {
                        if (one == 0) {
                                one = a[i];
                        } else {
                                two = a[i];
                                break;
                        }
                        --i;
                }
        }

        cout << one*two << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:26: error: no match for 'operator=' (operand types are 'std::vector<long long int>' and 'std::vector<int>')
   13 |         a = vector<int>(n);
      |                          ^
In file included from /usr/include/c++/14/vector:72,
                 from a.cc:2:
/usr/include/c++/14/bits/vector.tcc:210:5: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(const std::vector<_Tp, _Alloc>&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  210 |     vector<_Tp, _Alloc>::
      |     ^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/vector.tcc:211:42: note:   no known conversion for argument 1 from 'std::vector<int>' to 'const std::vector<long long int>&'
  211 |     operator=(const vector<_Tp, _Alloc>& __x)
      |               ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
In file included from /usr/include/c++/14/vector:66:
/usr/include/c++/14/bits/stl_vector.h:766:7: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::vector<_Tp, _Alloc>&&) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  766 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:766:26: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::vector<long long int>&&'
  766 |       operator=(vector&& __x) noexcept(_Alloc_traits::_S_nothrow_move())
      |                 ~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:788:7: note: candidate: 'std::vector<_Tp, _Alloc>& std::vector<_Tp, _Alloc>::operator=(std::initializer_list<_Tp>) [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
  788 |       operator=(initializer_list<value_type> __l)
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:788:46: note:   no known conversion for argument 1 from 'std::vector<int>' to 'std::initializer_list<long long int>'
  788 |       operator=(initializer_list<value_type> __l)
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
Language: C++

#include <iostream>
#include <map>
#include <algorithm>

int main()
{
	int n;
	std::cin >> n;
	std::map<int, int> freq;
	std::vector<int> pairs;
	for(int i = 0; i < n; i++)
	{
		int size;
		std::cin >> size;
		if(freq[size])
		{
			pairs.push_back(size);
			freq[size]--;
		}
		else
		{
			freq[size]++;
		}
	}
	pairs.push_back(0);
	pairs.push_back(0);
	std::sort(pairs.begin(), pairs.end());
	n = pairs.size();
	long long ans = pairs[n - 1] * pairs[n - 2];
	std::cout << ans << '\n';
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: error: 'vector' is not a member of 'std'
   10 |         std::vector<int> pairs;
      |              ^~~~~~
a.cc:4:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    3 | #include <algorithm>
  +++ |+#include <vector>
    4 | 
a.cc:10:21: error: expected primary-expression before 'int'
   10 |         std::vector<int> pairs;
      |                     ^~~
a.cc:17:25: error: 'pairs' was not declared in this scope
   17 |                         pairs.push_back(size);
      |                         ^~~~~
a.cc:25:9: error: 'pairs' was not declared in this scope
   25 |         pairs.push_back(0);
      |         ^~~~~
Language: C++

#include <iostream>
#include <map>
#include <vector>

using namespace std;

int main() {
    int n;
    scanf("%d", &n);
    map<int, int> cnt;
    for (int i = 0; i < n; i++) {
        int x;
        scanf("%d", &x);
        cnt[x]++;
    }
    vector<pair<int, int>> a;
    for (auto p : cnt) {
        if (p.second >= 2) {
            a.push_back(p);
        }
    }
    sort(a.rbegin(), a.rend());
    if (a.empty()) {
        cout << 0 << endl;
        return 0;
    }
    if (a[0].second >= 4) {
        cout << 1LL * a[0].first * a[0].first << endl;
        return 0;
    }
    if (a.size() == 1) {
        cout << 0 << endl;
        return 0;
    }
    cout << 1LL * a[0].first * a[1].first << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   22 |     sort(a.rbegin(), a.rend());
      |     ^~~~
      |     short
Language: C++

#include "bits/stdc++.h"
#define MOD 1000000007
#define INF 11234567890
#define in std::cin
#define out std::cout
#define rep(i,N) for(int i=0;i<N;++i)
typedef long long int LL;

LL N, A[112345];
LL res1, res2;

int main()
{
	in >> N;
	rep(i, N) { in >> A[i]; }

	std::sort(A, A + N);
	rep(i, N)
	{
		if (A[i] == A[i - 1] && res1 == 0)
		{
			res1 = A[i];
			++i;
		}
		else if (A[i] == A[i - 1] && res2 == 0)
		{
			res2 = A[i];
			break;
		}
	}

	out << res1*res2 << std::endl;
	return 0;
}#include "bits/stdc++.h"
#define MOD 1000000007
#define INF 11234567890
#define in std::cin
#define out std::cout
#define rep(i,N) for(int i=0;i<N;++i)
typedef long long int LL;

LL N, A[112345];
LL res1, res2;

int main()
{
	in >> N;
	rep(i, N) { in >> A[i]; }

	std::sort(A, A + N);
	rep(i, N)
	{
		if (A[i] == A[i - 1] && res1 == 0)
		{
			res1 = A[i];
			++i;
		}
		else if (A[i] == A[i - 1] && res2 == 0)
		{
			res2 = A[i];
			break;
		}
	}

	out << res1*res2 << std::endl;
	return 0;
}

Compiler output:
a.cc:34:2: error: stray '#' in program
   34 | }#include "bits/stdc++.h"
      |  ^
a.cc:34:3: error: 'include' does not name a type
   34 | }#include "bits/stdc++.h"
      |   ^~~~~~~
a.cc:42:4: error: redefinition of 'LL N'
   42 | LL N, A[112345];
      |    ^
a.cc:9:4: note: 'LL N' previously declared here
    9 | LL N, A[112345];
      |    ^
a.cc:42:7: error: redefinition of 'LL A [112345]'
   42 | LL N, A[112345];
      |       ^
a.cc:9:7: note: 'LL A [112345]' previously declared here
    9 | LL N, A[112345];
      |       ^
a.cc:43:4: error: redefinition of 'LL res1'
   43 | LL res1, res2;
      |    ^~~~
a.cc:10:4: note: 'LL res1' previously declared here
   10 | LL res1, res2;
      |    ^~~~
a.cc:43:10: error: redefinition of 'LL res2'
   43 | LL res1, res2;
      |          ^~~~
a.cc:10:10: note: 'LL res2' previously declared here
   10 | LL res1, res2;
      |          ^~~~
a.cc:45:5: error: redefinition of 'int main()'
   45 | int main()
      |     ^~~~
a.cc:12:5: note: 'int main()' previously defined here
   12 | int main()
      |     ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define dup(x,y) (((x)+(y)-1)/(y))
#define ALL(x) (x).begin(), (x).end()
typedef long long ll;
typedef pair<int, int> pii;
const double EPS = 1e-10;
const int INF = 1e9;
const ll LINF = 1e15;
const int MOD = 1000000007;
const double PI = acos(-1);
int dx[4] = {0,1,0,-1};
int dy[4] = {1,0,-1,0};

struct mint {
	ll x;
	mint(ll x=0):x((x%MOD+MOD)%MOD){}
	mint operator-() const { return mint(-x);}
	mint& operator+=(const mint a) {
	if ((x += a.x) >= MOD) x -= MOD;
		return *this;
	}
	mint& operator-=(const mint a) {
		if ((x += MOD-a.x) >= MOD) x -= MOD;
		return *this;
	}
	mint& operator*=(const mint a) { (x *= a.x) %= MOD; return *this;}
	mint operator+(const mint a) const { return mint(*this) += a;}
	mint operator-(const mint a) const { return mint(*this) -= a;}
	mint operator*(const mint a) const { return mint(*this) *= a;}
	mint pow(ll t) const {
		if (!t) return 1;
		mint a = pow(t>>1);
		a *= a;
		if (t&1) a *= *this;
		return a;
	}

	mint inv() const { return pow(MOD-2);}
	mint& operator/=(const mint a) { return *this *= a.inv();}
	mint operator/(const mint a) const { return mint(*this) /= a;}
};
istream& operator>>(istream& is, mint& a) { return is >> a.x;}
ostream& operator<<(ostream& os, const mint& a) { return os << a.x;}

int main() {
	int n;
	cin >> n;
	vector<string> g(2);
	rep(i,2) cin >> g[i];
	if (n <= 1) {
		cout << 3 << endl;
	} else {
		mint tot = 0;
		int prev = 0;
		for (int i = 0; i < n-1; i++) {
			if (!prev) {
				if (g[0][i] == g[0][i+1]) {
					i++;
					tot += 6;
					prev = -1;
				} else {
					tot += 3;
					prev = 1;
				}
			} else {
				if (i + 1 < n) {
					if (prev == -1) {
						if (g[0][i] == g[0][i+1]) {
							i++;
							tot *= 3;
						} else {
							tot *= 1;
							prev = 1;
						}
					} else {
						if (g[0][i] == g[0][i+1]) {
							i++;
							tot *= 2;
							prev = -1;
						} else {
							tot *= 2;
						}
					}
				} else {
					if (prev == -1) tot *= 1;
					else tot *= 3;
				}
			}
			tot %= MOD;
		}
		cout << tot << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:91:29: error: no match for 'operator%=' (operand types are 'mint' and 'const int')
   91 |                         tot %= MOD;
      |                         ~~~~^~~~~~
Language: C++

#include <iostream>
using namespace std;
typedef long long ll;
mod = 1000000007;

int main(){
  int n;
  cin >> n;
  string s1, s2;
  cin >> s1 >> s2;
  int cnt = 0;
  ll ans = 1;
  bool stand;
  if(s1[cnt] == s2[cnt]){
    ans *= 3;
    stand = true;
    cnt++;
  }else{
    ans *= 6;
    stand = false;
    cnt += 2;
  }
  while(cnt < n){
    if(s1[cnt] == s2[cnt]){
      if(stand){
        ans *= 2;
        ans %= mod;
      }else{
        
      }
      stand = true;
      cnt++;
    }else{
      if(stand){
        ans *= 2;
        ans %= mod;
      }else{
        ans *= 3;
        ans %= mod;
      }
      stand = false;
      cnt += 2;
    }
  }
  cout << ans << endl;
  return 0;
}
  
  

Compiler output:
a.cc:4:1: error: 'mod' does not name a type
    4 | mod = 1000000007;
      | ^~~
a.cc: In function 'int main()':
a.cc:27:16: error: 'mod' was not declared in this scope
   27 |         ans %= mod;
      |                ^~~
a.cc:36:16: error: 'mod' was not declared in this scope
   36 |         ans %= mod;
      |                ^~~
a.cc:39:16: error: 'mod' was not declared in this scope
   39 |         ans %= mod;
      |                ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
const ll mod=1000000007;
const int MAX_N = 1000;         // n の最大値
double tenchoku(double x1, double y1 , double x2 , double y2, double x, double y) {
double a = (y1-y2)/(x1-x2);
double b = -1;
double c = y1-a*x1;
double k = abs(a*x+b*y+c)/sqrt(a*a+b*b);
return k;}
// nCk を取得
double nCk(int n, int k) {
double res=1.0;
for(int i=0; i<n; i++){
res*=0.5;}
for(int i=0; i<k; i++){
res*=(double)(n-i);
res/=(double)(k-i);}
return res;}
int main(){
cout << fixed << setprecision(10);
ll counter=3;
ll f=0;
ll n;
cin>>n;
string s1,s2;
cin>>s1>>s2;
ll ca=0;
for(ll i=0; i<n; i++){
if(s1.at(i)==s2.at(i)&&ca>0){
f++;
ca++;}
else{
i++;
counter=(counter*2)%MOD;
ca=0;}}
cout<<counter<<endl;}

Compiler output:
a.cc: In function 'int main()':
a.cc:37:21: error: 'MOD' was not declared in this scope
   37 | counter=(counter*2)%MOD;
      |                     ^~~
Language: C++

#include <iostream>
#include <bits/stdc++.h>
using namespace std;
const int MAXN = 62;
const long long MOD = 1e9+7;
char arr[4][MAXN];
int grid[4][MAXN];
long long ans;
long long mx;
long long res;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int n;
    cin>>n;
    for(int i=1;i<=2;i++){
        for(int j=1;j<=n;j++){
            cin>>arr[i][j];
        }
    }
    long long ans = 3;
    for(int i=1;i<=2;i++){
        for(int j=1;j<=n;j++){
            if(arr[i][j] == arr[i+1][j]){
                
                grid[i][j] = 0;
                grid[i+1][j] = 0;
            }
            if(arr[i][j] == arr[i][j+1]){
                
                grid[i][j] = 1;
                grid[i][j+1] = -1;
            }
        }
    }
   if(arr[1][1] == arr[1]){
       //cout<<grid[1][1]<<" "<<grid[2][1]<<endl;
       ans = 3;
   }else{
       ans = 6;
   }
    int i = 1;
        for(int j=2;j<=n;j++){
            if(grid[i][j] == 0 && grid[i][j-1] == 0){
                
                ans*=1LL*2;
                ans%=MOD;
            }else if(grid[i][j] == 1){
                if(grid[i][j-1] == 0){
                   
                    ans*=1LL*2;
                    ans%=MOD;
                    continue;
                }
                
                ans*=1LL*3;
                ans%=MOD;
            }
        }
        cout<<ans<<endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:37:17: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   37 |    if(arr[1][1] == arr[1]){
      |       ~~~~~~~~~~^~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define all(x) (x).begin(),(x).end()
using ll = long long;
#define vl vector<long long>
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)


int main() {
  ll MOD=1000000007;
  ll N;
  cin>>N;
  ll count=0;
  vector<char> v1(N);
  rep(i,N){
    char a;
    cin>>a;
    v1.at(i)=a;
  }
  for (int i = 0; i < N; i++){
    if(i==0){
      if(N==1){
        count+=3;
        count=count%MOD;
      }
      else if(v1.at(i)==v1.at(i+1)){
        count+=6;
        count=count%MOD;
        i++;        if(i==N-1){
          break;
      }
      }else{
        count+=3;
        count=count%MOD;
      }
    }else{
      if(i==1){
        if(v1.at(1)!=v1.at(2)){
          count*=2;
          count=count%MOD;
        }else{
          count*=2;
          count=count%MOD;
          i++;        if(i==N-1){
          break;
      }
        }
      }
      else if(i==N-1){
        if(v1.at(i-2)==v1.at(i-1)){
          count*=1;
          count=count%MOD;
        }else{
          count*=2;
          count=count%MOD;
        }
      }
      else if(v1.at(i-2)==v1.at(i-1)&&v1.at(i)==v1.at(i+1)){
        count*=3;
        count=count%MOD;
        i++;        if(i==N-1){
          break;
      }
        
      }else if(v1.at(i-2)==v1.at(i-1)&&v1.at(i)!=v1.at(i+1)){
        count*=1;
        count=count%MOD;
      }else if(v1.at(i-2)!=v1.at(i-1)&&v1.at(i)!=v1.at(i+1)){
        count*=2;
        count=count%MOD;
      }else{
        count*=2;
        count=count%MOD;
        i++;
        if(i==N-1){
          break;
      }
    }
  }
  count=count%MOD;
  cout<<count<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:83:2: error: expected '}' at end of input
   83 | }
      |  ^
a.cc:10:12: note: to match this '{'
   10 | int main() {
      |            ^
Language: C++

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

int main() {
  int N;
  string S1, S2;
  cin >> N >> S1 >> S2;
  long long ans = 1;
  int i= 0;
  int tmp = -1;
  while (i < N) {
       if (S1[i] == S2[i]) {
           if (tmp < 0) ans = 3;
           else if (tmp == 0) ans *= 2;
           else ans *= 1;
           i++; tmp = 0;
           ans %= 1000000007
       } else {
           if (tmp < 0) ans = 6;
           else if (tmp == 0) ans *= 2;
           else ans *= 3;
           i += 2; tmp = 1;
           ans %= 1000000007
       }
   }
   ans %= 1000000007
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:29: error: expected ';' before '}' token
   17 |            ans %= 1000000007
      |                             ^
      |                             ;
   18 |        } else {
      |        ~                     
a.cc:23:29: error: expected ';' before '}' token
   23 |            ans %= 1000000007
      |                             ^
      |                             ;
   24 |        }
      |        ~                     
a.cc:26:21: error: expected ';' before 'cout'
   26 |    ans %= 1000000007
      |                     ^
      |                     ;
   27 |   cout << ans << endl;
      |   ~~~~
Language: C++

n = gets.to_i
s = 2.times.map {gets.chomp}
m = 1000000007

pre = -1
j = true
ans = 1
n.times do |i|
    if s[0][i] == s[1][i]
        if j
            j = false
            ans *= i == 0 ? 3 : 2 * 3 ** (i / 2)
        else
            ans *= pre + 1 == i ? 2 : 2 * 3 ** ((i - pre) / 2 - 1)
        end
        ans %= m
        pre = i
    end
end

ans *= 2 * 3 ** ((n - pre) / 2 - 1) if pre != n - 1
puts ans % m

Compiler output:
a.cc:1:1: error: 'n' does not name a type
    1 | n = gets.to_i
      | ^
a.cc:3:1: error: 'm' does not name a type
    3 | m = 1000000007
      | ^
Language: C++

#include<iostream>
#include<vector>
#include <algorithm>
#include <bits/stdc++.h>

using namespace std;

int main(){
  int N;
  
  string s1, s2;
  
  cin >> N;
  
  cin >> s1 >> s2;
  
  long long int ans = 1;
  
  for(int i=0;i<N;i++){
    
    if(s1[i] == s2[i]){
      if(i == 0){
        ans *= 3;
      }
      
      else if(s1[i-1] == s2[i-1]){
        ans *= 2;
        ans %= 1000000007;
      }
      
    }
     
      
      else{
        if(i == 0){
          ans *= 6;
          
        }
        
      }
        
        else{
          ans *= 2;
          ans %= 1000000007;
          i++;
        }
      }
      
}
      cout << ans << endl;
  
}
      
      
        
      
      
      
      
  
 


Compiler output:
a.cc: In function 'int main()':
a.cc:42:9: error: 'else' without a previous 'if'
   42 |         else{
      |         ^~~~
a.cc: At global scope:
a.cc:50:7: error: 'cout' does not name a type
   50 |       cout << ans << endl;
      |       ^~~~
a.cc:52:1: error: expected declaration before '}' token
   52 | }
      | ^
Language: C++

#include<iostream>
#include<vector>
#include <algorithm>
#include <bits/stdc++.h>

using namespace std;

int main(){
  int N;
  
  string s1, s2;
  
  cin >> N;
  
  cin >> s1 >> s2;
  
  long long int ans = 1;
  
  for(int i=0;i<N;i++){
    
    if(s1[i] == s2[i]){
      if(i == 0){
        ans *= 3;
      }
      
      else if(s1[i-1] == s2[i-1]){
        ans *= 2;
        ans %= 1000000007;
      }
      
    }
     
      
      else{
        if(i == 0){
          ans *= 6;
          
        }
        
      }
        
        else{
          ans *= 2;
          ans %= 1000000007;
          i++;
        }
      }
      
      cout << ans << endl;
  
}
      
      
        
      
      
      
      
  
 

Compiler output:
a.cc: In function 'int main()':
a.cc:42:9: error: 'else' without a previous 'if'
   42 |         else{
      |         ^~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <set>
#include <queue>
#include <cmath>
#include <map>
#include <limits.h>

using namespace std;

int main(){
    int n;
    cin >> n;
    string s,t;
    cin >> s >> t;
    int co=0;
    long long ans=1;
    bool state=s[0]==t[0]
    while(co<n){
        if(s[co]==t[co]){
            if(!state){
                ans=(ans*2)%1000000007;
            }
            state=false;
            co++;
        }
        else{
            if(state){
                ans=(ans*3)%1000000007;
            }
            else{
                ans=(ans*2)%1000000007;
            }
            state=true;
            co+=2;
        }
    }
    cout << (ans*3)%1000000007 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:5: error: expected ',' or ';' before 'while'
   21 |     while(co<n){
      |     ^~~~~
Language: C++

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

#define int long long
#define pb push_back
#define mp make_pair
#define F first
#define S second
#define FOR(i,a,b) for(int (i)=(a);(i)<(b);(i)++)
#define REP(i,n) FOR(i,0,n)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define SORT(c) sort((c).begin(),(c).end())

typedef long long ll;
const ll INF = 1LL<<60;
const ll mod = 1e9 + 7;
const int MAX_N = 5e5 + 5;
int dx[] = { -1,0,1,0 }, dy[] = { 0,1,0,-1 };
vector<ll> prime;

ll inv[MAX_N], fac[MAX_N];

template <class T = ll> T in() { T x; cin >> x; return (x); }
inline ll GCD(ll a, ll b) { ll c; while (b != 0) { c = a % b; a = b; b = c; }return a; }
inline ll LCM(ll a, ll b) { return a * b / GCD(a, b); }
inline ll POW(ll a, ll b) { ll c = 1; while (b > 0) { if (b & 1) { c = a * c%mod; }a = a * a%mod; b >>= 1LL; }return c; }
inline void _nCr() { fac[0] = 1; for (int i = 1LL; i < MAX_N; i++) { fac[i] = fac[i - 1] * i%mod; }for (int i = 0; i < MAX_N; i++) { inv[i] = POW(fac[i], mod - 2); } }
inline ll nCr(ll n, ll r) { return (fac[n] * inv[r] % mod)*inv[n - r] % mod; }
inline void PRI(ll n) { bool a[n + 1]; for (int i = 0; i < n + 1; i++) { a[i] = 1; }for (int i = 2; i < n + 1; i++) { if (a[i]) { prime.pb(i); ll b = i; while (b <= n) { a[b] = 0; b += i; } } } }

vector<vector<pair<int,int>>> Edge;
vector<int> node;

bool bellman_ford(int n,int s) {
	node = vector<int>(n,INF);
	node[s] = 0;
	REP (i,n) {
		REP (j,Edge.size()) {
			REP (k,Edge[j].size()) {
				int from = j,to = Edge[j][k].F;
				int cost = Edge[j][k].S;
				if (node[from] != INF && node[to] > node[from] + cost) {
					node[to] = node[from] + cost;
					if (i == n - 1 && to == n - 1) return true;
				}
			}
		}
	}
	return false;
}

//0は縦1は横
int dp[60][2];

signed main() {
	int n;
	string s1,s2;
	cin >> s1 >> s2;
	if (s1[0] == s1[1] && s1[0] == s2[0] && s2[0] == s2[1]) {
		dp[0][0] = 3;dp[1][0] = 6;dp[1][1] = 6;
	} else if (s1[0] == s2[0] && s1[1] != s2[1]) {
		dp[0][0] = 3;
	} else {
		dp[0][0] = 3;dp[1][0] = 6;
	}
	FOR (i,2,n) {
		if (s1[i] == s2[i]) dp[i][0] = (dp[i-1][0] * 2 + dp[i-1]) % mod;
		if (s1[i] == s1[i-1]) dp[i][1] = (dp[i-2][0] * 2 + dp[i-2][1]) % mod;
	}
	cout << (dp[n-1][0] + dp[n-1][1]) % mod << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:68:75: error: invalid operands of types 'long long int*' and 'const ll' {aka 'const long long int'} to binary 'operator%'
   68 |                 if (s1[i] == s2[i]) dp[i][0] = (dp[i-1][0] * 2 + dp[i-1]) % mod;
      |                                                ~~~~~~~~~~~~~~~~~~~~~~~~~~ ^ ~~~
      |                                                                |            |
      |                                                                |            const ll {aka const long long int}
      |                                                                long long int*
Language: C++

#include <bits/stdc++.h>
using namespace std;
int MOD = 1e9;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n;
    cin >> n;
    string s1, s2;
    cin >> s1 >> s2;

    long long ans = 0
    int idx = 0, pre = -1;
    while(idx < n){
        if(s1[idx] == s2[idx]){
            if(pre == -1){
                ans = 3;
            }else if(pre == 0){
                ans *= 2;
            }else{
                ans *= 1;
            }
            idx++;
            pre = 0;
        }else{
            if(pre == -1){
                ans = 6;
            }else if(pre == 0){
                ans *= 2;
            }else{
                ans *= 3;
            }
            x += 2;
            pre = 1;
        }
    }


    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: expected ',' or ';' before 'int'
   15 |     int idx = 0, pre = -1;
      |     ^~~
a.cc:16:11: error: 'idx' was not declared in this scope
   16 |     while(idx < n){
      |           ^~~
a.cc:18:16: error: 'pre' was not declared in this scope; did you mean 'pread'?
   18 |             if(pre == -1){
      |                ^~~
      |                pread
a.cc:26:13: error: 'pre' was not declared in this scope; did you mean 'pread'?
   26 |             pre = 0;
      |             ^~~
      |             pread
a.cc:28:16: error: 'pre' was not declared in this scope; did you mean 'pread'?
   28 |             if(pre == -1){
      |                ^~~
      |                pread
a.cc:35:13: error: 'x' was not declared in this scope
   35 |             x += 2;
      |             ^
a.cc:36:13: error: 'pre' was not declared in this scope; did you mean 'pread'?
   36 |             pre = 1;
      |             ^~~
      |             pread
Language: C++

#include <iostream>
#include <utility>
#include <string>
#include <algorithm>
#include <map>
#include <vector>
using namespace std;

int main(void) {
	int N;
	cin >> N;
	string S1, S2;
	cin >> S1 >> S2;
	if (S1.length() == 1) { cout << 3 << endl; return 0; }
	string type = "none";
	long long int ans = 0;
	for (int i = 0; i < N; i++) {
		if (S1[i] == S2[i]) {
			//縦パターン
			if (type == "none") {
				//最初の時
				ans += 3;
				type = "Vertical";
			}
			else if (type == "Vertical") {
				//縦 -> 縦
				ans *= 2;
			}
			else if (type == "Horizon") {
				//横 -> 縦
				//ans *= 2;
			}
			type = "Vertical";
		}
		else {
			//横パターン
			if (type == "none") {
				//最初の時
				ans += 6;
				type = "Horizon";
			}
			else if (type == "Vertical") {
				//縦 -> 横
				ans *= 2;
			}
			else if (type == "Horizon") {
				//横 -> 横
				ans *= 3;
			}
			type = "Horizon";
			i++;
		}
		ans = ans % (int)(pow(10, 9) + 7);
		//cout << i << " : " << ans << endl;
	}
	cout << ans % (int)(pow(10, 9) + 7) << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:53:35: error: 'pow' was not declared in this scope
   53 |                 ans = ans % (int)(pow(10, 9) + 7);
      |                                   ^~~
a.cc:56:29: error: 'pow' was not declared in this scope
   56 |         cout << ans % (int)(pow(10, 9) + 7) << endl;
      |                             ^~~
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
import java.util.Arrays;

class Reader {
    static BufferedReader reader;
    static StringTokenizer tokenizer;

    static void init(InputStream input) {
        reader = new BufferedReader(new InputStreamReader(input) );
        tokenizer = new StringTokenizer("");
    }

    static String next() throws IOException {
        while ( ! tokenizer.hasMoreTokens() ) {
            tokenizer = new StringTokenizer(reader.readLine() );
        }
        return tokenizer.nextToken();
    }

    static String nextLine() throws IOException {
        return reader.readLine();
    }

    static int nextInt() throws IOException {
        return Integer.parseInt( next() );
    }

    static double nextDouble() throws IOException {
        return Double.parseDouble( next() );
    }

    static long nextLong() throws IOException {
        return Long.parseLong( next() );
    }

    static char nextChar() throws IOException {
        return next().charAt(0);
    }
}

public final class prac{
    public static void main(String[] args) throws IOException {
        Reader.init(System.in);
        int n=Reader.nextInt();
        String s=Reader.next();
        String p=Reader.next();
        int c=0,mod=1000000007;
        long ans=1;
        for(int i=0;i<n;){
            if(c==0){
                ans*=3;
                if(s.charAt(i)==p.charAt(i)){
                    i++;
                    c=1;
                }
                else{
                    ans*=2;
                    i+=2;
                    c=2;
                }
            }
            else if(c==1){
                if(s.charAt(i)==p.charAt(i)){
                    ans*=2;
                    i++;
                    c=1;
                }
                else {
                    ans*=2;
                    i+=2;
                    c=2;
                }
            }
            else{
                if(s.charAt(i)==p.charAt(i)){
                    i++;
                    c=1;
                }
                else{
                    ans*=3;
                    i+=2;
                    c=2;
                }
            }
            ans=ans%mod;
        }
        System.out.println(ans);
    }
}


Compiler output:
Main.java:45: error: class prac is public, should be declared in a file named prac.java
public final class prac{
             ^
1 error
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.StringTokenizer;



/** Class for buffered reading int and double values */
class Reader {
    static BufferedReader reader;
    static StringTokenizer tokenizer;

    /** call this method to initialize reader for InputStream */
    static void init(InputStream input) {
        reader = new BufferedReader(
                     new InputStreamReader(input) );
        tokenizer = new StringTokenizer("");
    }

    /** get next word */
    static String next() throws IOException {
        while ( ! tokenizer.hasMoreTokens() ) {
            //TODO add check for eof if necessary
            tokenizer = new StringTokenizer(
                   reader.readLine() );
        }
        return tokenizer.nextToken();
    }

    static int nextInt() throws IOException {
        return Integer.parseInt( next() );
    }
	
    static double nextDouble() throws IOException {
        return Double.parseDouble( next() );
    }
}
public class dominoes {

	public static void main(String[] args) throws IOException{
		// TODO Auto-generated method stub
		Reader.init(System.in);
		int n = Reader.nextInt();
		String s1 = Reader.next();
		String s2 = Reader.next();
		
		if(n == 1) {
			System.out.println(3);
		}else if(n == 2 || n == 3){
			System.out.println(6);
		}else {
			String d;
			int i = 1;
			long a = 1;
			if(s1.charAt(0)== s2.charAt(0)) {
				d = "single";
				a = 3;
			}else {
				d = "double";
				i = 2;
				a = 6;
			}
			while(i<n) {
				if(s1.charAt(i) != s2.charAt(i)) {
					if(d.compareTo("single") == 0) {
						a = ((a%1000000007)*2)%1000000007;
					}else {
						a = ((a%1000000007)*3)%1000000007;
					}
					i+=2;
					d = "double";
				}else {
					if(d.compareTo("single") == 0) {
						a = ((a%1000000007)*2)%1000000007;
					}
					d = "single";
					i++;
				}
			}
			System.out.println(a);
		}
		
		

	}

}


Compiler output:
Main.java:39: error: class dominoes is public, should be declared in a file named dominoes.java
public class dominoes {
       ^
1 error