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

#include<bits/stdc++.h>
using namespace std;
const long long maxn=2e9+100;
typedef long long ll;
ll c[maxn],a[maxn];
int n,m=0;
ll k;
int main()
{
    cin>>n>>k;
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            c[m++]=a[i]*a[j];
        }
    }
    sort(c,c+m);
    cout<<c[k-1];
    return 0;
}


Compiler output:
/tmp/ccpOgCSr.o: in function `main':
a.cc:(.text+0xb): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0x27): relocation truncated to fit: R_X86_64_PC32 against symbol `k' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0x4f): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0x6e): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0x9b): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0xb3): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0xc1): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0xca): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0xe9): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0xf8): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccpOgCSr.o
a.cc:(.text+0x107): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: C++

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

int main()
{
  map<long long,long long> Im;
  int N,i,j;
  long long K;
  cin >> N >> K;
  vector<long long> A;
  long long t;
  long long sum;
  sum=0
  for(i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(i=0;i<N;i++)
  {
    for(j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second>=K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
}
  



Compiler output:
a.cc: In function 'int main()':
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(i=0;i<N;i++)
      |   ~~~   
a.cc:14:18: error: expected ';' before ')' token
   14 |   for(i=0;i<N;i++)
      |                  ^
      |                  ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int maxn=2e9;
typedef long long ll;
ll c[maxn],a[maxn];
int n,m=0;
ll k;
int main()
{
    cin>>n>>k;
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            c[m++]=a[i]*a[j];
        }
    }
    sort(c,c+m);
    cout<<c[k-1];
    return 0;
}


Compiler output:
/tmp/ccjhBk8S.o: in function `main':
a.cc:(.text+0xb): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0x27): relocation truncated to fit: R_X86_64_PC32 against symbol `k' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0x4f): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0x6e): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0x9b): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0xb3): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0xc1): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0xca): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0xe9): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0xf8): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/ccjhBk8S.o
a.cc:(.text+0x107): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: C++

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

int main(){
  long n,k;
  cin >> n >> k;
  long a;
  vector<long> A;
  for(int i=0;i<n;i++){
    cin >> a;
    A.push_back(a);
  }
  long col=0;
  vector<long> com;
  for(int i=0;i<n;i++){
    for(int j=i+1;j<n;j++){
      if(i!=j){
        col=A[i]*A[j];
        com.push_back(col);
      }
    }
  }
  sort(com.begin(),com.end());
  cout << com[k-1] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   24 |   sort(com.begin(),com.end());
      |   ^~~~
      |   short
Language: C++

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

int main()
{
  map<long long,long long> Im;
  int N;
  long long K;
  cin >> N >> K;
  vector<long long> A;
  long long t;
  long long sum;
  sum=0
  for(int i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(int i=0;i<N;i++)
  {
    for(int j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second>=K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
}
  



Compiler output:
a.cc: In function 'int main()':
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(int i=0;i<N;i++)
      |   ~~~   
a.cc:14:15: error: 'i' was not declared in this scope
   14 |   for(int i=0;i<N;i++)
      |               ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1;} return 0;}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1;} return 0;}
const long long INFLL = 1LL<<60;
const int INF = 1<<28;
const long long MOD =1000000000+7;
void solve(int a){cout<<( a?"APPROVED":"DENIED")<<endl;}
int main(){
    int n;
    cin >>a>>b>>c;
	bool ans=false;
	
    solve(ans);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: 'a' was not declared in this scope
   11 |     cin >>a>>b>>c;
      |           ^
a.cc:11:14: error: 'b' was not declared in this scope
   11 |     cin >>a>>b>>c;
      |              ^
a.cc:11:17: error: 'c' was not declared in this scope
   11 |     cin >>a>>b>>c;
      |                 ^
Language: C++

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

int main()
{
  map<long long,long long> Im;
  int N;
  long long K;
  cin >> N >> K;
  vector<long long> A;
  long long t;
  long long sum;
  sum=0
  for(int i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(int i=0;i<N;i++)
  {
    for(int j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second=>K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(int i=0;i<N;i++)
      |   ~~~   
a.cc:14:15: error: 'i' was not declared in this scope
   14 |   for(int i=0;i<N;i++)
      |               ^
a.cc:28:35: error: expected primary-expression before '>' token
   28 |       if(sum<K&&(sum+iter->second=>K))
      |                                   ^
Language: C++

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

int main()
{
  std::map<long long,long long> Im;
  int N;
  long long K;
  cin >> N >> K;
  vector<long long> A;
  long long t;
  long long sum;
  sum=0
  for(int i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(int i=0;i<N;i++)
  {
    for(int j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second=>K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(int i=0;i<N;i++)
      |   ~~~   
a.cc:14:15: error: 'i' was not declared in this scope
   14 |   for(int i=0;i<N;i++)
      |               ^
a.cc:28:35: error: expected primary-expression before '>' token
   28 |       if(sum<K&&(sum+iter->second=>K))
      |                                   ^
Language: C++

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

int main()
{
  std::map<long long,long long> Im;
  int N;
  long long K;
  cin >> N >> K;
  vecot<long long> A;
  long long t;
  long long sum;
  sum=0
  for(int i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(int i=0;i<N;i++)
  {
    for(int j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second=>K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: 'vecot' was not declared in this scope
   10 |   vecot<long long> A;
      |   ^~~~~
a.cc:10:9: error: expected primary-expression before 'long'
   10 |   vecot<long long> A;
      |         ^~~~
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(int i=0;i<N;i++)
      |   ~~~   
a.cc:14:15: error: 'i' was not declared in this scope
   14 |   for(int i=0;i<N;i++)
      |               ^
a.cc:23:10: error: 'A' was not declared in this scope
   23 |       Im[A[i]*A[j]]++;
      |          ^
a.cc:28:35: error: expected primary-expression before '>' token
   28 |       if(sum<K&&(sum+iter->second=>K))
      |                                   ^
Language: C++

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

int main()
{
  std::map<long long,long long> Im;
  int N;
  long long K;
  cint >> N >> K;
  vecot<long long> A;
  long long t;
  long long sum;
  sum=0
  for(int i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(int i=0;i<N;i++)
  {
    for(int j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second=>K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: 'cint' was not declared in this scope; did you mean 'uint'?
    9 |   cint >> N >> K;
      |   ^~~~
      |   uint
a.cc:10:3: error: 'vecot' was not declared in this scope
   10 |   vecot<long long> A;
      |   ^~~~~
a.cc:10:9: error: expected primary-expression before 'long'
   10 |   vecot<long long> A;
      |         ^~~~
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(int i=0;i<N;i++)
      |   ~~~   
a.cc:14:15: error: 'i' was not declared in this scope
   14 |   for(int i=0;i<N;i++)
      |               ^
a.cc:23:10: error: 'A' was not declared in this scope
   23 |       Im[A[i]*A[j]]++;
      |          ^
a.cc:28:35: error: expected primary-expression before '>' token
   28 |       if(sum<K&&(sum+iter->second=>K))
      |                                   ^
Language: C++

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

int main() {
    long long n,k;
    cin >> n >> k;
    vector<long long> a(n);
    for(int i=0;i<n;i++){
        cin >> a.at(i);
    }
    vector<long long> ans(n(n-1)/2);
    for(int i=0;i<n;i++){
        int count=0;
        for(int j=i+1;j<n;j++){
            count++;
            ans.at((2*n-i+1)*i/2+count)=a.at(i)*a.at(j);
        }
    }
    sort(ans.begin(),ans.end());
    cout << ans.(k-1);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:28: error: 'n' cannot be used as a function
   11 |     vector<long long> ans(n(n-1)/2);
      |                           ~^~~~~
a.cc:20:17: error: expected unqualified-id before '(' token
   20 |     cout << ans.(k-1);
      |                 ^
Language: C++

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

int main()
{
  std::map<long long,long long> Im;
  int N;
  long long K:
  cint >> N >> K;
  vecot<long long> A;
  long long t;
  long long sum;
  sum=0
  for(int i=0;i<N;i++)
  {
    cin >>t;
    A.push_back(t);
  }
  for(int i=0;i<N;i++)
  {
    for(int j=i;j<N;j++)
    {
      Im[A[i]*A[j]]++;
    }
  }
  auto begin = Im.begin(), end = Im.end();
    for (auto iter = begin; iter != end; iter++) {
      if(sum<K&&(sum+iter->second=>K))
      {
        cout << iter->first<<endl;
      }
      sum=iter->second+sum;
       
    }
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: found ':' in nested-name-specifier, expected '::'
    8 |   long long K:
      |              ^
      |              ::
a.cc:8:13: error: 'K' has not been declared
    8 |   long long K:
      |             ^
a.cc:9:8: error: qualified-id in declaration before '>>' token
    9 |   cint >> N >> K;
      |        ^~
a.cc:10:3: error: 'vecot' was not declared in this scope
   10 |   vecot<long long> A;
      |   ^~~~~
a.cc:10:9: error: expected primary-expression before 'long'
   10 |   vecot<long long> A;
      |         ^~~~
a.cc:13:8: error: expected ';' before 'for'
   13 |   sum=0
      |        ^
      |        ;
   14 |   for(int i=0;i<N;i++)
      |   ~~~   
a.cc:14:15: error: 'i' was not declared in this scope
   14 |   for(int i=0;i<N;i++)
      |               ^
a.cc:23:10: error: 'A' was not declared in this scope
   23 |       Im[A[i]*A[j]]++;
      |          ^
a.cc:28:14: error: 'K' was not declared in this scope
   28 |       if(sum<K&&(sum+iter->second=>K))
      |              ^
a.cc:28:35: error: expected primary-expression before '>' token
   28 |       if(sum<K&&(sum+iter->second=>K))
      |                                   ^
Language: C++

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

typedef long long ll;

#define MAX_N 200003
#define forl(i, start, stop, step) for (int i = start; i < stop; i += step)
#define rforl(i, start, stop, step) for (int i = start; i > stop; i += step)
#define pii pair<int, int>
#define F first
#define S second
#define vi vector<int>
#define vpii vector< pii >
#define vll vector<ll>
#define pb push_back

ll a[MAX_N];
int main() {
    int n; ll k; scanf("%d%lld", &n, &k);
    for (int i = 0; i < n; i++) scanf("%lld", a[i]);
    
    vll pos, neg;
    
    for (int i = 0; i < n; i++) {
        if (a[i] <= 0) neg.pb(a[i]);
        else pos.pb(a[i]);
    }
    
    sort(pos.begin(), pos.end());
    sort(neg.begin(), neg.end());
    
    vll blocks, runner;
    
    int sz1 = (int)pos.size(), sz2 = (int)neg.size();
    
    for (int i = 0; i < sz2; i++) {
        blocks.pb(sz1);
        runner.pb(neg[i]);
    }
    
    if (k <= 1ll * sz1 * sz2) {
        int sz = (int)blocks.size();
        vll pre(sz + 1, 0);
        
        for (int i = 1; i < sz + 1; i++) {
            pre[i] = pre[i - 1] + blocks[i - 1];
        }
        
        int idx = lower_bound(pre.begin(), pre.end(), k) - pre.begin();
        if (pre[idx] == k) {
            ll ans = 1ll * runner[idx - 1] * pos[sz1 - 1];
        }
        else {
            int diff = k - pre[idx - 1];
            ll ans = 1ll * runner[idx - 1] * pos[diff - 1];
        }
        cout << ans;
        return 0;
    }
    
    k -= (1ll * sz1 * sz2);
    
    for (int i = 0; i < sz2; i++) neg[i] *= -1;
    sort(neg.begin(), neg.end());
    
    ll lo = 1, hi = 1000000000000000000;
    while (lo < hi) {
        ll mid = lo + (hi - lo) / 2;
        
        ll cur = 0;
        for (int i = 1; i < sz1; i++) {
            if (pos[i] > mid) break;
            ll y = mid / (pos[i]);
            ll cnt = upper_bound(pos.begin(), pos.end(), y) - pos.begin();
            cnt = min(cnt, 1ll * i);
            cur += cnt;
        }
        
        for (int i = 1; i < sz2; i++) {
            if (neg[i] > mid) break;
            if (neg[i] == 0) {cur += i; continue;}
            
            ll y = mid / (neg[i]);
            ll cnt = upper_bound(neg.begin(), neg.end(), y) - neg.begin();
            cnt = min(cnt, 1ll * i);
            cur += cnt;
        }
        
        if (cur >= k) hi = mid;
        else lo = mid + 1;
    }
    
    cout << lo;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:57:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   57 |         cout << ans;
      |                 ^~~
      |                 abs
Language: C

#include<iostream>
#include<queue>
#include<algorithm>
#include<map>
#include<set>

using namespace std;

int main()
{
    long long int n,k,temp;
    long long  int old[200005];
    vector<long long int> all;
    cin>>n>>k;
    for(long long int i = 0;i<n;i++)
        cin>>old[i];
    for(long long int i = 0;i<n-1;i++)
        for(long long int j = i+1;j<n;j++)
        {
            temp=old[i]*old[j];
            all.push_back(temp);
        }
    sort(all.begin(),all.end());
    
    cout<<all.at(k-1)<<endl;
    return 0;
}


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

#include<iostream>
#include<queue>
#include<algorithm>
#include<map>
#include<set>

using namespace std;

int main()
{
    long long int n,k,temp;
    long long  int old[200005];
    vector<long long int> all;
    cin>>n>>k;
    for(long long int i = 0;i<n;i++)
        cin>>old[i];
    for(long long int i = 0;i<n-1;i++)
        for(long long int j = i+1;j<n;j++)
        {
            temp=old[i]*old[j];
            all.push_back(temp);
        }
    sort(all.begin(),all.end());
    
    cout<<all.at(k-1)<<endl;
    return 0;
}



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

#include<bits/stdc++.h>
#define ll long long int
using namespace std;
int main()
{
  ll n,k;
  cin>>n>>k;
  vector<int> arr(n);
  for(ll i=0;i<n;i++)
  {
    cin>>arr[i];
  }
  ll t=(n*(n-1))/2;
 vector<int>b(t,0)
 for(ll i=0;i<n;i++)
 {  ll p=arr[i];
    for(ll j=n;j>i;j--)
    {   ll h=0;
        b[h]+=p*arr[j];
        h++;
    }
 }
 sort(b.begin(),b.end());
 cout<<b[k]<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:2: error: expected ',' or ';' before 'for'
   15 |  for(ll i=0;i<n;i++)
      |  ^~~
a.cc:15:13: error: 'i' was not declared in this scope
   15 |  for(ll i=0;i<n;i++)
      |             ^
Language: C

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

long long n, k;
long long a[200004];

long long f(long long mid){
	long long ret = 0;
	for(int i = 0; i < n; i++){
		if(a[i] == 0){
			if(mid >= 0)	ret += n-1;
			continue;
		}
		if(a[i] < 0){
			long long target = mid/a[i];
			if(target*a[i] > mid)	target++;
			int idx = lower_bound(a, a+n, target)-a;
			ret += n - idx;
			if(idx <= i)	ret -= 1;
		}
		else{
			long long target = mid/a[i];
			if(target*a[i] > mid)	target--;
			int idx = upper_bound(a, a+n, target)-a-1;
			if(idx < 0)	continue;
			ret += idx + 1;
			if(idx >= i)	ret -= 1;
		}
	}
	return ret/2;
}

int main() {
	cin>>n>>k;
	for(int i = 0; i < n; i++)	cin>>a[i];
	sort(a, a+n);
	long long lo = -1e18, hi = 1e18;
	while(lo < hi){
		long long mid = lo + (hi - lo)/2;
		if(f(mid) >= k)	hi = mid;
		else	lo = mid + 1;
	}
	cout<<lo<<endl;
	// your code goes here
	return 0;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

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

int main(){
    int N, K, M, copy, i, j;
    int p = 0;
    int q = 0;
    cin >> N >> K;
    M = N * (N-1) / 2;
    __int64 *A;
    A = new __int64[N];
    __int64 *B;
    B = new __int64[M];
    for(i=0; i < N; i++){
        cin >> A[i];
    }
    for(i = 0; i < N; i++){
        for(j = i + 1; j < N; j++){
            B[p] = A[i] * A[j];
            p = p + 1;
        }
    }
    for(p = 0; p<M; p++){
        for(q = 0; q < M-1; q++){
            if(B[q] > B[q+1]){
                copy = B[q];
                B[q] = B[q+1];
                B[q+1] = copy;
            }
        }
    }
    cout <<  B[K-1] << endl;

    system("pause");
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: '__int64' was not declared in this scope; did you mean '__int64_t'?
   11 |     __int64 *A;
      |     ^~~~~~~
      |     __int64_t
a.cc:11:14: error: 'A' was not declared in this scope
   11 |     __int64 *A;
      |              ^
a.cc:12:13: error: '__int64' does not name a type; did you mean '__int64_t'?
   12 |     A = new __int64[N];
      |             ^~~~~~~
      |             __int64_t
a.cc:13:14: error: 'B' was not declared in this scope
   13 |     __int64 *B;
      |              ^
a.cc:14:13: error: '__int64' does not name a type; did you mean '__int64_t'?
   14 |     B = new __int64[M];
      |             ^~~~~~~
      |             __int64_t
Language: C++

#include<bits/stdc++.h>
using namespace std;
const int maxn=2e10+100;
typedef long long ll;
ll c[maxn],a[maxn];
int n,m=0;
ll k;
int main()
{
    cin>>n>>k;
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    for(int i=0;i<n;i++){
        for(int j=i+1;j<n;j++){
            c[m++]=a[i]*a[j];
        }
    }
    sort(c,c+m);
    cout<<c[k-1];
    return 0;
}


Compiler output:
a.cc:3:20: warning: overflow in conversion from 'double' to 'int' changes value from '2.00000001e+10' to '2147483647' [-Woverflow]
    3 | const int maxn=2e10+100;
      |                ~~~~^~~~
a.cc:5:6: error: size of array 'c' exceeds maximum object size '9223372036854775807'
    5 | ll c[maxn],a[maxn];
      |      ^~~~
a.cc:5:14: error: size of array 'a' exceeds maximum object size '9223372036854775807'
    5 | ll c[maxn],a[maxn];
      |              ^~~~
Language: C++

#include<bits/stdc++.h>


using namespace std;
 
int main(){
int N,K;

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



vector<int> t((N*N-N)/2);
for(int i = 0; i < N -1; i++){
    for(int j = N-1; j > 0; j++){
        if(i < j) { t[k] = a[i] * a[j]; k++; }
    }
}
sort(t.begin(),t.end());

cout << t[K];



return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:23: error: 'k' was not declared in this scope
   21 |         if(i < j) { t[k] = a[i] * a[j]; k++; }
      |                       ^
Language: C++

#include<bits/stdc++.h>


using namespace std;
 
int main(){
int N,K;

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

int k = 0;

vector<int> t((N*N-N)/2);
for(int i = 0; i < N -1; i++){
    for(int j = N-1; j > 0; j++){
        if(i < j) { t[k] = a[i] * a[j]; k++ }
    }
}
sort(t.begin(),t.end());

cout << t[K];



return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:44: error: expected ';' before '}' token
   21 |         if(i < j) { t[k] = a[i] * a[j]; k++ }
      |                                            ^~
      |                                            ;
Language: C++

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

int main()
{
    ll n, k;
    cin >> n >> k;
    vector<ll> a(n);
    vector<ll> ans(n * (n - 1) / 2 + 10);

    rep(i, n) cin >> a[i];

    ll count = 0;
    rep(i, n)
    {
        for (ll j = i + 1; j < n; ++j)
        {å
            ans[count++] = a[i] * a[j];
        }
    }

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

    cout << ans[k - 1] << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:10: error: '\U000000e5' was not declared in this scope
   19 |         {å
      |          ^
Language: C++

#include<bits/stdc++.h>


using namespace std;
 
int main(){
int N,K;

cin >> N >> K;
vector<long int> a(N);
int count = 0;
for(int i = 0; i < N; i++){
    cin >> a[i]; 
    if(a[i] < 0){ count += 1; }

int k = 0;

vector<int> t((N*N-N)/2);
for(int i = 0; i < N -1; i++){
    for(int j = N-1; j > 0; j++){
        if(i < j) { t[k] = a[i] * a[j]; k++ }
    }
}
sort(t.begin(),t.end());

cout << t[K];



return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:44: error: expected ';' before '}' token
   21 |         if(i < j) { t[k] = a[i] * a[j]; k++ }
      |                                            ^~
      |                                            ;
a.cc:31:2: error: expected '}' at end of input
   31 | }
      |  ^
a.cc:6:11: note: to match this '{'
    6 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
vector<long long int>v(n+1);
   vector<long long int> sol;
int main(){
    long long n,k;
    cin >> n >> k;
    
    for(int i = 1; i<=n; i++)cin >> v[i];
    
    for(int i = 1; i<=n; i++){
        for(int j = i+1; j<=n; j++){
            sol.emplace_back(v[i] * v[j]);
        }
    }
    sort(sol.begin(),sol.end());
    cout << sol[k-1] << endl;
    
}

Compiler output:
a.cc:3:24: error: 'n' was not declared in this scope; did you mean 'yn'?
    3 | vector<long long int>v(n+1);
      |                        ^
      |                        yn
Language: C++

#include <bits/stdc++.h>

#define ll long long
#define vi vector<int>
#define vll vector<long long>
#define sll set<long long>
#define si set<int>
#define stk stack<int>
#define que queue<int>
#define pb push_back
#define ff first
#define ss second
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

using namespace std;

ll power(ll a,ll b){
	if(b==0) return 1;
	if(b&1) return power(a,b/2)*power(a,b/2)*a;
	else return power(a,b/2)*power(a,b/2);
}

int main(){
	int t=1;
	//cin>>t;
	while(t--){
		int n,k;
		cin>>n>>k;
		map<ll,int> m;
		vll a(n);
		for(int i=0;i<n;i++)
			cin>>a[i];
		ll co=0;
		for(int i=0;i<n&&b;i++){
			for(int j=i+1;j<n;j++){
				m[a[i]*a[j]]++;
			}
		}
		ll ans;
		for(auto i:m){
			co+=i.ss;
			if(co>=k){
				ans=i.ff;
				break;
			}
		}
		cout<<ans<<endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:34: error: 'b' was not declared in this scope
   34 |                 for(int i=0;i<n&&b;i++){
      |                                  ^
Language: C++

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

int main() {
int n,k;
cin>>n>>k;
  vector<int> a(n);
for(int i=0;i<n;i++)
  cin>>a.at(i);
sort(a.begin(),a,end());
  vector<int> b(k*k);
for(int i=0;i<k;i++){
  for(int j=0;j<k;j++)
    b.at(i*k+j)=a.at(i)*a.at(j);
  }
sort(b.begin(),b.end());
  cout<<b.at(k)<<endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:21: error: no matching function for call to 'end()'
   10 | sort(a.begin(),a,end());
      |                  ~~~^~
In file included from /usr/include/c++/14/bits/algorithmfwd.h:39,
                 from /usr/include/c++/14/bits/stl_algo.h:59,
                 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/initializer_list:99:5: note: candidate: 'template<class _Tp> constexpr const _Tp* std::end(initializer_list<_Tp>)'
   99 |     end(initializer_list<_Tp> __ils) noexcept
      |     ^~~
/usr/include/c++/14/initializer_list:99:5: note:   candidate expects 1 argument, 0 provided
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52:
/usr/include/c++/14/bits/range_access.h:74:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(_Container&)'
   74 |     end(_Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:74:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:85:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.end()) std::end(const _Container&)'
   85 |     end(const _Container& __cont) -> decltype(__cont.end())
      |     ^~~
/usr/include/c++/14/bits/range_access.h:85:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:106:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr _Tp* std::end(_Tp (&)[_Nm])'
  106 |     end(_Tp (&__arr)[_Nm]) noexcept
      |     ^~~
/usr/include/c++/14/bits/range_access.h:106:5: note:   candidate expects 1 argument, 0 provided
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:166:
/usr/include/c++/14/valarray:1249:5: note: candidate: 'template<class _Tp> _Tp* std::end(valarray<_Tp>&)'
 1249 |     end(valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1249:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/valarray:1265:5: note: candidate: 'template<class _Tp> const _Tp* std::end(const valarray<_Tp>&)'
 1265 |     end(const valarray<_Tp>& __va) noexcept
      |     ^~~
/usr/include/c++/14/valarray:1265:5: note:   candidate expects 1 argument, 0 provided
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
using namespace std;
int main()
{
	int n, k;
	cin >> n >> k;
	k--;
	vector<int> v(n);
	vector<long long> p;
	for (int i = 0; i < n; i++) {
		cin >> v[i];
		for (int j = i - 1; j >= 0; j--) {
			p.push_back(long long(v[i]) * long long(v[j]));
		}
	}
	sort(p.begin(), p.end());
	cout << p[k] << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:37: error: expected primary-expression before 'long'
   17 |                         p.push_back(long long(v[i]) * long long(v[j]));
      |                                     ^~~~
Language: Java

import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    int n=sc.nextInt();
    int k=sc.nextInt();
    int[] a=new int[n];
    for(int i=0;i<n;i++){
      a[i]=sc.nextInt();
    }
    long[] b=new long[n*(n-1)/2];
    long cnt=0;
    for(int i=0;i<n;i++){
      for(int j=i+1;j<n;j++){
        b[cnt]=a[i]*a[j];
        cnt++;
      }
    }
    Arrays.sort(b);
    System.out.println(b[k-1]);
  }
}

Compiler output:
Main.java:16: error: incompatible types: possible lossy conversion from long to int
        b[cnt]=a[i]*a[j];
          ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std ;
long long a[20000000000],arr[200005],temp,m,n;
int main(){
	
	
	cin>>n>>m;
	
	for(int i=1;i<=n;i++){
		cin>>arr[i];
	}
	
	for(int i=1;i<=n;i++){
		for(int j=i+1;j<=n;j++){
			a[temp]=arr[i]*arr[j];
			temp++;
		}
	}
	
	sort(a,a+temp-1);
	
	cout<<a[m-1]<<endl;
}

Compiler output:
/tmp/cclYwTtM.o: in function `main':
a.cc:(.text+0xb): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0x27): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0x4f): relocation truncated to fit: R_X86_64_PC32 against symbol `arr' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0x75): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0xa5): relocation truncated to fit: R_X86_64_PC32 against symbol `arr' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0xbd): relocation truncated to fit: R_X86_64_PC32 against symbol `arr' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0xc8): relocation truncated to fit: R_X86_64_PC32 against symbol `temp' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0xe2): relocation truncated to fit: R_X86_64_PC32 against symbol `temp' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0xed): relocation truncated to fit: R_X86_64_PC32 against symbol `temp' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0xfe): relocation truncated to fit: R_X86_64_PC32 against symbol `n' defined in .bss section in /tmp/cclYwTtM.o
a.cc:(.text+0x114): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>
using namespace std ;
long long a[20000000000],arr[200005],temp,n;
int main(){
	
	
	cin>>n>>m;
	
	for(int i=1;i<=n;i++){
		cin>>arr[i];
	}
	
	for(int i=1;i<=n;i++){
		for(int j=i+1;j<=n;j++){
			a[temp]=arr[i]*arr[j];
			temp++;
		}
	}
	
	sort(a,a+temp-1);
	
	cout<<a[m-1]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: 'm' was not declared in this scope; did you mean 'tm'?
    7 |         cin>>n>>m;
      |                 ^
      |                 tm
Language: C++

#include<bits/stdc++.h>
#define maxn 200000+5

using namespace std;
typedef long long ll;

const ll maxx = 5e10+5;

ll a[maxn];
ll b[maxx];

int main(){
	ios::sync_with_stdio(false);a
	cin.tie(0);
	cout.tie(0);
	ll n,k;
	cin>>n>>k;
	ll num = 0;
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			b[num] = a[i]*a[j];
			num++;
		}
	}
	sort(b,b+(n*(n-1))/2);
	cout<<b[k-1]<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:38: error: expected ';' before 'cin'
   13 |         ios::sync_with_stdio(false);a
      |                                      ^
      |                                      ;
   14 |         cin.tie(0);
      |         ~~~
Language: C++

#include <algorithm>
#include <iostream>
#include <cstdlib>
#include <cstring>
#include <vector>
#include <cstdio>
#include <stack>
#include <queue>
#include <ctime>
#include <map>
#include <set>
using namespace std;

#define fs first
#define sc second
#define pb push_back
#define mp make_pair 
typedef pair<int, int> pii;
typedef double db;
typedef long long ll;
typedef long double ldb;
typedef unsigned long long ull;

const int N = 2e5 + 10;
const int mo = 1e9 + 7;

int qpow(int a, int b) {
	int ans = 1;
	for(; b >= 1; b >>= 1, a = (ll) a * a % mo)
		if(b & 1) ans = (ll) ans * a % mo;
	return ans;
}
int n, rpos; ll k;
int a[N];
ll C(ll n) { return n * (n - 1) / 2; }
int main() {
	scanf("%d%lld", &n, &k);
	for(int i = 1; i <= n; i ++) scanf("%d", a + i);
	sort(a + 1, a + n + 1);
	ll l = 0, r = 0, z = 0, L = 0, R = 0, Z = 0;
	for(int i = 1; i <= n; i ++) z += a[i] == 0;
	for(int i = 1; i <= n; i ++) l += a[i] < 0;
	for(int i = 1; i <= n; i ++) r += a[i] > 0;
	L = l * r; R = C(l) + C(r); Z = C(n) - L - R;
	rpos = n + 1;
	for(int i = 1; i <= n; i ++) if(a[i] > 0) {
		rpos = i; break ;
	}
	if(k <= L) {
		ll ql = -1e18, qr = -1, mid, ans = -233;
		while(ql <= qr) {
			mid = (ql + qr) >> 1;
			ll sum = 0, now = r, cur = rpos;
			for(int i = 1; i <= n && a[i] < 0; i ++) {
				ll up = mid % a[i] == 0 ? mid / a[i] + 1 : ceil((double) mid / a[i]);
				while(now && a[cur] < up) cur ++, now --;
				if(!now) break ;
				sum += now;
			}
			if(sum < k) ql = (ans = mid) + 1;
			else qr = mid - 1;
		}
		printf("%lld\n", ans);
	} else if(k <= L + Z) {
		puts("0");
	} else {
		k -= L + Z;
		ll ql = 1, qr = 1e18, mid, ans = -233;
		while(ql <= qr) {
			mid = (ql + qr) >> 1;
			ll sum = 0, now = r, cur = n;
			for(int i = rpos; i <= n; i ++) {
				ll up = mid % a[i] == 0 ? mid / a[i] - 1 : floor((long double) mid / a[i]);
				while(now && a[cur] > up) cur --, now --;
				sum += cur >= i ? now - 1 : now; //
			}
			now = l; cur = 1;
			for(int i = n; i >= 1; i --) if(a[i] < 0) {
				ll up = mid % a[i] == 0 ? mid / a[i] + 1 : ceil((long double) mid / a[i]);
				while(now && a[cur] < up) cur ++, now --;
				sum += cur <= i ? now - 1 : now;
			}
			sum >>= 1;
			if(sum < k) ql = (ans = mid) + 1;
			else qr = mid - 1;
		}
		printf("%lld\n", ans);
	}
	return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:55:76: error: 'ceil' was not declared in this scope
   55 |                                 ll up = mid % a[i] == 0 ? mid / a[i] + 1 : ceil((double) mid / a[i]);
      |                                                                            ^~~~
a.cc:73:76: error: 'floor' was not declared in this scope
   73 |                                 ll up = mid % a[i] == 0 ? mid / a[i] - 1 : floor((long double) mid / a[i]);
      |                                                                            ^~~~~
a.cc:79:76: error: 'ceil' was not declared in this scope
   79 |                                 ll up = mid % a[i] == 0 ? mid / a[i] + 1 : ceil((long double) mid / a[i]);
      |                                                                            ^~~~
Language: Java

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Scanner;

//AtCoder Beginner Contest 155
//D	Pairs
public class Main84 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		int K = Integer.parseInt(sc.next());
		long[] A = new long[N];
		for (int i = 0; i < N; i++) {
			A[i] = Integer.parseInt(sc.next());
		}
		sc.close();

		List<Long> l_Plus = new ArrayList<>();
		List<Long> l_Minus = new ArrayList<>();
		for (int i = 0; i < N; i++) {
			for (int j = i + 1; j < N; j++) {
				if (A[i] >= 0 && A[j] >= 0 || A[i] <= 0 && A[j] <= 0) {
					// 0 はplus側
					l_Plus.add(A[i] * A[j]);
				} else {
					l_Minus.add(A[i] * A[j]);
				}
			}
		}
		if (K < l_Minus.size()) {
			Collections.sort(l_Minus);
			System.out.println(l_Minus.get(K - 1));
		} else {
			Collections.sort(l_Plus);
			System.out.println(l_Plus.get((K - l_Minus.size()) - 1));
		}
	}
}


Compiler output:
Main.java:8: error: class Main84 is public, should be declared in a file named Main84.java
public class Main84 {
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int N=2e5+5;
int n,k,t;
ll a[N],b[N*N];
int main(){
	ios::sync_with_stdio(0),cin.tie(0),cout.tie(0);
	cin>>n>>k;
	for(int i=0;i<n;i++){
		scanf("%lld",a+i);
	}
	
	for(int i=0;i<n;i++){
		for(int j=i+1;j<n;j++){
			b[t++]=a[i]*a[j];
		}
	}
	sort(b,b+t);
	cout<<b[k-1]<<endl;
	return 0;
}

Compiler output:
a.cc:6:12: warning: integer overflow in expression of type 'int' results in '1347294361' [-Woverflow]
    6 | ll a[N],b[N*N];
      |           ~^~
a.cc:6:12: error: size of array 'b' exceeds maximum object size '9223372036854775807'
Language: C++

#include<bits/stdc++.h>
using namespace std;
 
int main()
{
  auto n,k;
  cin>>n>>k;
  auto arr[n];
  vector<long int> v;
  for(int i=0;i<n;i++)
    cin>>arr[i];
  for(int i=0;i<n-1;i++)
  {
    for(int j=i+1;j<n;j++)
    {
      auto t=arr[i]*arr[j];
      v.push_back(t);
    }
  }
  sort(v.begin(),v.end());
  cout<<v[k-1]<<endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: declaration of 'auto n' has no initializer
    6 |   auto n,k;
      |   ^~~~
a.cc:6:3: error: declaration of 'auto k' has no initializer
a.cc:11:10: error: 'arr' was not declared in this scope
   11 |     cin>>arr[i];
      |          ^~~
a.cc:16:14: error: 'arr' was not declared in this scope
   16 |       auto t=arr[i]*arr[j];
      |              ^~~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define rep2(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define is(s) freopen((const char*)(s),"r",stdin)
#define os(s) freopen((const char*)(s),"w",stdout)
#define elif else if
#define pb push_back
#define ll long long
#define mp make_pair
#define all(x) x.begin(),x.end()
//#define x first
//#define y second
int n,a[200005];
ll k;
vector<ll>ans;
using namespace std;

int main()
{
	//is("input.txt");os("output.txt");
	cin>>n>>k;
	rep(i,n)
	{
		cin>>a[i];
		rep(j,i)
		ans.pb(a[i]*a[j]);
	}
	sort(all(ans));
	cout<<ans[k]<<endl;
	return 0;}


Compiler output:
a.cc:15:1: error: 'vector' does not name a type
   15 | vector<ll>ans;
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:26:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   26 |                 ans.pb(a[i]*a[j]);
      |                 ^~~
      |                 abs
a.cc:28:18: error: 'ans' was not declared in this scope; did you mean 'abs'?
   28 |         sort(all(ans));
      |                  ^~~
a.cc:10:16: note: in definition of macro 'all'
   10 | #define all(x) x.begin(),x.end()
      |                ^
Language: C++

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

const int INF = 0x3f3f3f3f;
const int MAXN = 2e5+5;
long long nums[MAXN];
long long ans[MAXN*100000];

int main()
{
	int n,k; cin>>n>>k;
	for(int i = 0; i < n; ++i) {
		cin>>nums[i];
	}
	int len = 0;
	for(int i = 0; i < n-1; ++i) {
		for(int j = i+1; j < n; ++j) {
			ans[len++] = (long long)nums[i]*nums[j];
		}
	}
	sort(ans, ans+len);
	cout<<ans[k-1]<<endl;
	return 0; 
}

Compiler output:
a.cc:9:19: warning: integer overflow in expression of type 'int' results in '-1474336480' [-Woverflow]
    9 | long long ans[MAXN*100000];
      |               ~~~~^~~~~~~
a.cc:9:19: error: size '-1474336480' of array 'ans' is negative
Language: C++

#include <iostream>
#include <stdio.h>
using namespace std;

int main()
{
    long n, k;
    signed long a[200000];
    scanf("%ld %ld", &n, &k);
    signed long b[n*(n-1)/2+1];
    for (long int i = 0; i < n; i++)
    {
        scanf("%ld", &a[i]);
    }
    int index = 0;

    for (long i = 0; i < n-1; i++)
    {
        for (long k = i+1;k < n;k++)
        {
            b[index] = a[i] * a[k];
            index++;
        }
    }

    std::sort(b,b+index);

    cout << b[k-1] << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:10: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   26 |     std::sort(b,b+index);
      |          ^~~~
      |          qsort
Language: C++

#include <iostream>
#include <cmath>
#include <vector>
#define rep(i,k) for(int i =0; i<k; i++)
#define ll long long int

using namespace std;



int main() {
    int n,k;
    cin >> n >> k;
    ll a[n];
    vector<int> p;
    
    rep(i,n){
        cin >> a[i];
    }
    
    rep(i,n){
        for(int j = i; j<n; j++){
            p.push_back(a[i]*a[j]);
        }
    }
    
    sort(p.begin(), p.end());
    
    cout << p[k-1];
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:5: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   27 |     sort(p.begin(), p.end());
      |     ^~~~
      |     sqrt
Language: C++

lude<bits/stdc++.h>
#define int long long
using namespace std;
constexpr int mod=1e9+7;
signed main(){
    int n,k,a[200000];
    cin>>n>>k;
    for(int i=0;i<n;i++)
        cin>>a[i];
    sort(a,a+n);
    int ub=mod*mod,lb=-(mod*mod);
    while(ub-lb>1){
        int mid=(ub+lb)/2,cnt=0;
        for(int i=0;i<n;i++){
            if(a[i]>0)
                cnt+=upper_bound(a,a+n,(long double)mid/a[i])-a;
            else if(a[i]<0)
                cnt+=n-(lower_bound(a,a+n,(long double)mid/a[i])-a);
            else if(mid>=0)
                    cnt+=n;
            if(a[i]*a[i]<=mid)
                cnt--;
        }
        (cnt>=2*k?ub:lb)=mid;
    }
    cout<<ub<<endl;
}

Compiler output:
a.cc:1:1: error: 'lude' does not name a type
    1 | lude<bits/stdc++.h>
      | ^~~~
a.cc: In function 'int main()':
a.cc:7:5: error: 'cin' was not declared in this scope
    7 |     cin>>n>>k;
      |     ^~~
a.cc:10:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   10 |     sort(a,a+n);
      |     ^~~~
      |     short
a.cc:16:22: error: 'upper_bound' was not declared in this scope
   16 |                 cnt+=upper_bound(a,a+n,(long double)mid/a[i])-a;
      |                      ^~~~~~~~~~~
a.cc:18:25: error: 'lower_bound' was not declared in this scope
   18 |                 cnt+=n-(lower_bound(a,a+n,(long double)mid/a[i])-a);
      |                         ^~~~~~~~~~~
a.cc:26:5: error: 'cout' was not declared in this scope
   26 |     cout<<ub<<endl;
      |     ^~~~
a.cc:26:15: error: 'endl' was not declared in this scope
   26 |     cout<<ub<<endl;
      |               ^~~~
Language: C++

#include <iostream>
#include <stdio.h>
using namespace std;
long n, k;
signed long a[200000];
int main()
{
    scanf("%ld %ld", &n, &k);
    signed long b[n*(n-1)/2+1];
    for (long int i = 0; i < n; i++)
    {
        scanf("%ld", &a[i]);
    }
    int index = 0;

    for (long i = 0; i < n-1; i++)
    {
        for (long k = i+1;k < n;k++)
        {
            b[index] = a[i] * a[k];
            index++;
        }
    }

    std::sort(b,b+index);

    cout << b[k-1] << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:10: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   25 |     std::sort(b,b+index);
      |          ^~~~
      |          qsort
Language: C++

#include <iostream>
#include <stdio.h>

using namespace std;

long n, k;
signed long a[200000];



int main()
{
    scanf("%ld %ld", &n, &k);
    signed long b[n*(n-1)/2+1];
    for (long int i = 0; i < n; i++)
    {
        scanf("%ld", &a[i]);
    }
    int index = 0;

    for (long i = 0; i < n-1; i++)
    {
        for (long k = i+1;k < n;k++)
        {
            b[index] = a[i] * a[k];
            index++;
        }
    }

    sort(b,b+index);

    cout << b[k-1] << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   30 |     sort(b,b+index);
      |     ^~~~
      |     short
Language: C++

#n = int(input())
import itertools
n,k = map(int,input().split())
a_L = list(map(int,input().split()))

c = list(itertools.combinations(a_L,2))

ans = []

for k1,k2 in c:
    ans.append(k1*k2)
#print(ans)
ans = sorted(ans)

print(ans[k-1])

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #n
    1 | #n = int(input())
      |  ^
a.cc:12:2: error: invalid preprocessing directive #print
   12 | #print(ans)
      |  ^~~~~
a.cc:2:1: error: 'import' does not name a type
    2 | import itertools
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
Language: C++

#include<bits/stdc++.h>
using namespace std;
 
int main()
{
  int n,k
  cin>>n>>k;
  int arr[n];
  vector<long long int> v;
  for(int i=0;i<n;i++)
    cin>>arr[i];
  for(int i=0;i<n-1;i++)
  {
    for(int j=i+1;j<n;j++)
    {
      long long int t=arr[i]*arr[j];
      v.push_back(t);
    }
  }
  sort(v.begin(),v.end());
  cout<<v[k-1]<<endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: expected initializer before 'cin'
    7 |   cin>>n>>k;
      |   ^~~
a.cc:21:11: error: 'k' was not declared in this scope
   21 |   cout<<v[k-1]<<endl;
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int a[200005];
long long s[2000005]={0e20};

int main(){
	int n,k,h=0,i,j;
	cin>>n>>k;
	
	for(i=1;i<=n;i++)
	cin>>a[i];
	
	for(i=1;i<=n-1;i++)
	for(j=i+1;j<=n;j++){
		s[h]=a[i]*a[j];
		h++;
	}
	
	sort(s,s+h);
	cout<<s[k-1];
	return 0;
} 

Compiler output:
a.cc:4:23: error: narrowing conversion of '0.0' from 'double' to 'long long int' [-Wnarrowing]
    4 | long long s[2000005]={0e20};
      |                       ^~~~
Language: C++

#include <iostream>
#include <vector>

using namespace std;

int main() {
    int a, b, c, N,K , flag;
    int array[200000];
    vector<int> vec;

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

    for (int i = 0; i < N; i++) {
        for (int j = i + 1; j < N; j++) {
            vec.push_back(array[i] * array[j]);
        }
    }

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

    cout << vec[K - 1] << endl;
}

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(vec.begin(), vec.end());
      |     ^~~~
      |     short