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

#include<iostream>
#include<algorithm>
using namespace std;
int n,k,t,a[30020],s[30020][30020],b[30020];
int main()
{
	cin>>n>>k;
	for(int i=1;i<=n;i++)
	{
		cin>>a[i];
	}
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=n;j++)
		{
			if(s[i][j]==1 && s[j][i]==1) continue;
			s[i][j]=1;
			t++;
			b[t]=a[i]*a[j];
		}
	}
	sort(b+1,b+1+n);
	cout<<b[k];
	return 0;
}

Compiler output:
/tmp/ccD5F0tT.o: in function `main':
a.cc:(.text+0x16a): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccD5F0tT.o
a.cc:(.text+0x1b1): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccD5F0tT.o
a.cc:(.text+0x1bb): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccD5F0tT.o
a.cc:(.text+0x1dd): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccD5F0tT.o
collect2: error: ld returned 1 exit status
Language: C++

readInt() = parse.(Int,split(readline()))
comb2(x) = div((x-1)x,2)

function f(x,neg,pos)
    ret = 0
    n=length(neg); p=length(pos)
    j=1
    for i in 1:n
        while j<=p && neg[i]*pos[j]>x
            j+=1
        end
        
        ret+=p-j+1
    end
    return ret
end

g(x,neg,pos) = h(x,neg)+h(x,pos)

function h(x,a)
    ret = 0
    sz=length(a)
    j=sz
    for i in 1:sz
        while j>i && a[i]*a[j]>x
            j-=1
        end
        j<=i && break
        ret+=j-i
    end
    return ret
end

function answer(K,neg,pos,fc)
    lo=-10^18; hi=10^18
    while hi-lo>1
        c = div(lo+hi,2)
        K <= fc(c,neg,pos) ? (hi=c) : (lo=c)
    end
    println(hi)
end

function solve()
    N,K = readInt()
    A = readInt()
    sort!(A)
    zero=0
    neg=Int[]; pos=Int[]
    for i in 1:N
        if A[i]==0
            zero+=1
            continue
        end
        push!((A[i]<0 ? neg : pos), A[i])
    end
    n=length(neg); p=length(pos)
    α = n*p
    γ = comb2(n)+comb2(p)
    β = comb2(N)-α-γ
    if K<=α
        answer(K,neg,pos,f)
    elseif K<=α+β 
        println(0)
    else
        reverse!(neg); neg*=-1
        answer(K-α-β,neg,pos,g)
    end
end
solve()

Compiler output:
a.cc:1:11: error: expected constructor, destructor, or type conversion before '=' token
    1 | readInt() = parse.(Int,split(readline()))
      |           ^
a.cc:6:20: error: 'p' does not name a type
    6 |     n=length(neg); p=length(pos)
      |                    ^
a.cc:35:16: error: 'hi' does not name a type
   35 |     lo=-10^18; hi=10^18
      |                ^~
a.cc:48:16: error: 'pos' does not name a type
   48 |     neg=Int[]; pos=Int[]
      |                ^~~
a.cc:56:20: error: 'p' does not name a type
   56 |     n=length(neg); p=length(pos)
      |                    ^
a.cc:65:24: error: 'neg' does not name a type
   65 |         reverse!(neg); neg*=-1
      |                        ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main() {
    int N;
    ll K;
    cin >> N >> K;
    ll A[N];
    vector<ll> B;
    vector<ll> C;
    ll z = 0;    
　　for (int i = 0; i < N; i++) {
        cin >> A[i];
        if (A[i] == 0) z++;
        else if (A[i] < 0) B.push_back(A[i]);
        else C.push_back(A[i]);
    }
    ll nb = B.size();
    ll nc = C.size();
    ll f0 = B.size() * C.size();
    ll f1 = f0 + z * (B.size() + C.size()) + (z * (z - 1)) / 2;
    sort(B.begin(), B.end());
    sort(C.begin(), C.end());
    if (K <= f0) {
         ll l = -1e18 - 1ll;
         ll r = 0;
         while (r - l > 1) {
             ll m = (l + r) / 2;
             ll sum = 0;
             int j = nc - 1;
             for (int i = B.size() - 1; i >= 0; i--) {
                 while (j >= 0 && B[i] * C[j] <= m) j--;
                 sum += nc - 1 - j;
             }
              cout << sum << " " << m << "\n";
             if (sum < K) l = m;
             else r = m;
         }
         
         cout << r << "\n";
    } else if (K <= f1) {
        cout << "0\n";
    } else {
        ll l = 0;
        ll r = 1e18 + 1ll;
        while (r - l > 1) {
            ll m = (l + r) / 2;
            ll sum = f1;
            int j = nb - 1;
            for (int i = 0; i < nb - 1; i++) {
                while (j >= 0 && B[i] * B[j] <= m) j--;
                sum += min((int)nb - j - 1, (int)nb - i - 1);
            }
            
            j = 0;
            for (int i = nc - 1; i >= 1; i--) {
                while (j < nc && C[i] * C[j] <= m) j++;
                sum += min(i, j);
            }
            // cout << sum << " " << m << "\n";
            if (sum < K) l = m;
            else r = m;
        }
        cout << r << "\n";
    }
    return 0;
}

Compiler output:
a.cc:12:1: error: extended character 　 is not valid in an identifier
   12 | 　　for (int i = 0; i < N; i++) {
      | ^
a.cc:12:1: error: extended character 　 is not valid in an identifier
a.cc: In function 'int main()':
a.cc:12:10: error: expected primary-expression before 'int'
   12 | 　　for (int i = 0; i < N; i++) {
      |          ^~~
a.cc:12:21: error: 'i' was not declared in this scope
   12 | 　　for (int i = 0; i < N; i++) {
      |                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < n; i++)
static const long long INF = 1000000;
using p = pair<int64_t,int64_t>;
int main(){
    int n,k;
    cin >> n >> k;
    vector<int64_t> vec(n);
    rep(i,n){
        cin >> vec[i];
    }
    vector <int64_t> ans(n*(n-1)/2);
    rep(i,n){
        rep(j,i){
            ans.push_back(vec[i] * vec[j]);
        }
    }
    sort(ans.begin(),ans.end());
    int64_t a = ans[k-1];
    

Compiler output:
a.cc: In function 'int main()':
a.cc:20:26: error: expected '}' at end of input
   20 |     int64_t a = ans[k-1];
      |                          ^
a.cc:6:11: note: to match this '{'
    6 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i,n) for (int i = 0; i < n; i++)
static const long long INF = 1000000;
using p = pair<int64_t,int64_t>;
int main(){
    int n,k;
    cin >> n >> k;
    vector<int64_t> vec(n);
    rep(i,n){
        cin >> vec[i];
    }
    vector <int64_t> ans(n*(n-1)/2);
    rep(i,n){
        rep(j,i){
            ans.push_back(vec[i] * vec[j]);
        }
    }
    sort(ans.begin(),ans.end());
    int a = ans[k-1];
    c

Compiler output:
a.cc: In function 'int main()':
a.cc:21:5: error: 'c' was not declared in this scope
   21 |     c
      |     ^
a.cc:21:6: error: expected '}' at end of input
   21 |     c
      |      ^
a.cc:6:11: note: to match this '{'
    6 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
const int maxn = 2e5 + 7;
const LL inf = 1e18;
 
LL a[maxn];
int n;
LL k;
 
bool check(LL mid){
	
	LL cnt = 0;
  	for (int i = 1; i < n; ++i){
    	if (a[i] == 0){
    	  	if (mid >= 0) cnt += n - i;
    	}
    	LL d = mid / a[i];
    	if (a[i] > 0){
      		if (abs(mid) % a[i] != 0){
    			if ( (d == 0 && mid < 0) || d < 0) d--;
      		}
      		int fs = upper_bound(a + i + 1, a + n + 1, d) - a;
      		cnt += f - i - 1;
    	}
		else{
   			if (abs(mid) % abs(a[i]) != 0){
        		if ( (d == 0 && mid < 0) || d > 0) d++;
      		}
      		int fs = lower_bound(a + i + 1, a + n + 1, d) - a;
      		cnt += n - f + 1;
    	}
  	}
  	return (cnt >= k);
  	
}
void Read(){
	
	#define TASK "ABC"
//	freopen(TASK".inp", "r", stdin);
//	freopen(TASK".out", "w", stdout);
    ios_base::sync_with_stdio(0);
	cin >> n >> k;
  	for (int i = 1; i <= n; ++i) cin >> a[i];
	
}
void Magic(){
	
	sort(a + 1, a + n + 1);
	LL l = -inf, r = inf;
	while (l <= r){
		
		LL mid = (l + r) / 2;
		if (check(mid)) r = mid - 1;
		else l = mid + 1;
		
	}
	cout << r + 1;
	return;
	
}
int main(){
  
  	Read();
  	Magic();
  
	return 0;
}

Compiler output:
a.cc: In function 'bool check(LL)':
a.cc:24:24: error: 'f' was not declared in this scope; did you mean 'fs'?
   24 |                 cnt += f - i - 1;
      |                        ^
      |                        fs
a.cc:31:28: error: 'f' was not declared in this scope; did you mean 'fs'?
   31 |                 cnt += n - f + 1;
      |                            ^
      |                            fs
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long LL;
const int maxn = 2e5 + 7;
const LL inf = 1e18;
 
LL a[maxn];
int n;
LL k;
 
bool check(LL mid){
	
	LL cnt = 0;
  	for (int i = 1; i < n; ++i){
    	if (a[i] == 0){
    	  	if (mid >= 0) cnt += n - i;
    	}
    	LL d = mid / a[i];
    	else if (a[i] > 0){
      		if (abs(mid) % a[i] != 0){
    			if ( (d == 0 && mid < 0) || d < 0) d--;
      		}
      		int f = upper_bound(a + i + 1, a + n + 1, d) - a;
      		cnt += f - i - 1;
    	}
		else{
   			if (abs(mid) % abs(a[i]) != 0){
        		if ( (d == 0 && mid < 0) || d > 0) d++;
      		}
      		int f = lower_bound(a + i + 1, a + n + 1, d) - a;
      		cnt += n - f + 1;
    	}
  	}
  	return (cnt >= k);
  	
}
void Read(){
	
	#define TASK "ABC"
//	freopen(TASK".inp", "r", stdin);
//	freopen(TASK".out", "w", stdout);
    ios_base::sync_with_stdio(0);
	cin >> n >> k;
  	for (int i = 1; i <= n; ++i) cin >> a[i];
	
}
void Magic(){
	
	sort(a + 1, a + n + 1);
	LL l = -inf, r = inf;
	while (l <= r){
		
		LL mid = (l + r) / 2;
		if (check(mid)) r = mid - 1;
		else l = mid + 1;
		
	}
	cout << r + 1;
	
}
int main(){
  
  Read();
  Magic();
  
return 0;
}

Compiler output:
a.cc: In function 'bool check(LL)':
a.cc:19:9: error: 'else' without a previous 'if'
   19 |         else if (a[i] > 0){
      |         ^~~~
Language: C++

#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int N = 2e5 + 5, mod = 1e9 + 7;

ll n, k, a[N];

bool tmam(ll x){
    ll c = 0;
    if(x == 0){
        for(int i = 0; i < n; i++){
            if(a[i] > 0) break;
            int idx = lower_bound(a + i + 1, a + n, 0) - a;
            c + = n - idx;
        }
        return c >= k;
    }
    for(int i = 0; i < n; i++){
        if(x > 0){
           if(a[i] == 0) c += n - 1 - i;
           else if(a[i] > 0){
            int idx = upper_bound(a + i + 1, a + n, x / a[i]) - a;
            c += idx - i - 1;
           }
           else{
            int idx = lower_bound(a + i + 1, a + n, x / a[i]) - a;
            c += n - idx;
           }
        }
        else{
            if(a[i] >= 0) break;
            int idx = lower_bound(a + i + 1, a + n, x / a[i] + (x % a[i] != 0)) - a;
            c += n - idx;
        }
    }
    return c >= k;
}

int main(){
    ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
    cin >> n >> k;
    for(int i = 0; i < n; i++) cin >> a[i];
    sort(a, a + n);
    ll low = -1e18, high = 1e18, mid, ans;
    while(high >= low){
        mid = low + high >> 1;
        if(tmam(mid)){
            ans = mid;
            high = mid - 1;
        }
        else low = mid + 1;
    }
    cout << ans;

    return 0;
}


Compiler output:
a.cc: In function 'bool tmam(long long int)':
a.cc:14:17: error: expected primary-expression before '=' token
   14 |             c + = n - idx;
      |                 ^
Language: C++

#include "bits/stdc++.h"
using namespace std;
const long long INF = long long(1e18) + 1;
int main() {
	int N;
	long long K;
	cin >> N >> K;
	vector<long long>A(N);
	for (int n = 0; n < N; ++n) {
		cin >> A[n];
	}
	//小さい順にソート
	sort(A.begin(), A.end());
	long long l = -INF;
	long long r = INF;	
	while (l + 1 < r) {
		long long x = (l + r) / 2;
		bool check = [&] {
			long long tmp = 0;
			for (int n = 0; n < N; ++n) {
				if (A[n] < 0) {
					int l = -1;
					int r = N;
					while (l + 1 < r) {
						int c = (l + r) / 2;
						if (A[c] * A[n] < x) {
							r = c;
						}
						else {
							l = c;
						}
					}
					tmp += (long long)(N - r); 
				}
				else {
					int l = -1, r = N;
					while (l + 1 < r) {
						int c = (l + r) / 2;
						if (A[c] * A[n] < x) l = c; else r = c;
					}
					tmp += (long long)r; 
				}
				if (A[n] * A[n] < x) {
					tmp--;
				}
			}
			tmp /= 2; 
			return tmp < K;
		}();
		if (check) {
			l = x;
		}
		else {
			r = x;
		}
	}
	cout << l << endl;
	return 0;
}

Compiler output:
a.cc:3:23: error: expected primary-expression before 'long'
    3 | const long long INF = long long(1e18) + 1;
      |                       ^~~~
Language: C++

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

#define IOS ios_base::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
#define pb push_back
#define mp make_pair
#define ff first
#define ss second
#define I insert
#define endl '\n'
#define all(x) x.begin(), x.end()

#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
template<class T> using oset=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
 
using vvll = vector< vector<ll> >;
using vll = vector<ll> ;
using vb = vector<bool> ;
using pll = pair<ll, ll> ;

const ll maxs = 1e6+5;
const ll lmaxs = 20;
ll mod = 1e9+7;
ll oo = 1e18;


void pre(){



}

int n,
long k;
int a[maxs];

bool check(ll MAX){
    ll c=0;
    for(int i=1;i<=n;i++){
        if(a[i] > MAX and a[i] > 0)
            break;

        if(a[i] > 0){
            int l = i+1,r=n;
            int res=i;
            while(l<=r){
                int mid = (l+r)/2;
                if(a[i]*1ll*a[mid] <= MAX){
                    res = mid;
                    l = mid+1;
                }else r = mid-1;
            }
            c += res-i;
        }else if(a[i] < 0){
            int l=i+1,r=n;
            int res=n+1;
            while(l<=r){
                int mid = (l+r)/2;
                if(a[i]*1ll*a[mid] <= MAX){
                    res = mid;
                    r = mid-1;
                }else l = mid+1;
            }
            c += n-res+1;
        }else{
            if(MAX >= 0){
                c += n-i;
            }
        }
    }
    return c >= k;
} 

void solve(){

    cin >> n >> k;
    for(int i=1;i<n+1;i++){
        cin >> a[i];
    }
    sort(a+1,a+n+1);
    ll l = -1e18 , r = 1e18;
    ll ans=1e18;
    while(l <= r){
        ll mid = (l+r)/2;
        bool res = check(mid);
        if(res){
            ans = mid;
            r = mid-1;
        }else{
            l = mid+1;
        }
    }
    cout << ans << endl;


}

int main(){
    // #ifndef ONLINE_JUDGE
    // freopen("input00.txt","r",stdin);
    // #endif
    IOS;
    pre();
    ll T = 1;
    //cin>>T;
    while(T--){
        solve();   
    }
    return 0;
}

Compiler output:
a.cc:37:1: error: expected unqualified-id before 'long'
   37 | long k;
      | ^~~~
a.cc: In function 'bool check(ll)':
a.cc:74:17: error: 'k' was not declared in this scope
   74 |     return c >= k;
      |                 ^
a.cc: In function 'void solve()':
a.cc:79:17: error: 'k' was not declared in this scope
   79 |     cin >> n >> k;
      |                 ^
Language: C++

#include<stdio.h>
typedef long long LL;
const LL LINF=0x7fffffffffffffff;
#define rep(i,N) for(int i=0;i<(LL)N;i++)
int compare(const int*a,const int*b){if(*a<*b)return -1;else if(*a==*b)return 0;else return 1;}
inline LL IN(void)
{
  LL x=0;int f=0,c=getchar();while(c<48||c>57){f^=c==45,c=getchar();}
  while(c>47&&c<58){x=x*10+c-48,c=getchar();}return f?-x:x;
}
int main(void)
{
  int A[200000]={0},N=IN(),i=0,m=0,p=0,z=0,temp;
  LL K=IN(),low=-LINF/2,mid,high=LINF/2,count;
  rep(i,N){A[i]=IN();if(A[i]<0)m++;else if(A[i]>0)p++;else z++;}
  qsort(A,N,sizeof(int),(int(*)(const void*,const void*))compare);
  if(K>1ll*m*p&&K<1ll*m*p+1ll*z*(N-1)/2)return puts("0"),0;else temp=0;
  if(K<=1ll*m*p)high=1ll;else low=-1ll;
  while(high-low>1)
  {
    mid=(low+high)/2,count=0;
    if(!mid)count=1ll*m*p;
    else if(mid>0)
    {
      count=1ll*m*p+z*(m+p)+z*(z-1)/2;temp=N-1;i=m+z;
      while(i<N)
      {
        while(1ll*A[temp]*A[i]>=mid){temp--;}
        if(temp>i)count+=temp-i++;else break;
      }
      temp=0;i=m-1;
      while(i>=0)
      {
        while(1ll*A[temp]*A[i]>=mid){temp++;}
        if(temp<i)count+=i-temp,i--;else break;
      }
    }
    else
    {
      temp=m-1;i=N-1;
      while(i>=m+z)
      {
        while(temp>=0&&1ll*A[temp]*A[i]>=mid){temp--;}
        if(temp>=0){count+=temp+1;}i--;
      }
    }
    if(count<K)low=mid;else high=mid;
  }
  return printf("%lld\n",low),0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:3: error: 'qsort' was not declared in this scope
   16 |   qsort(A,N,sizeof(int),(int(*)(const void*,const void*))compare);
      |   ^~~~~
Language: C++

#include <iostream>
#include <cmath>
#include <cstdio>
#define LL long long
using namespace std;
const int MAX=2e5+3;
LL a[MAX];
LL rin()
{
	LL s=0;
	char c=getchar();
	bool bj=false;
	for(;(c>'9'||c<'0')&&c!='-';c=getchar());
	if(c=='-')bj=true,c=getchar();
	for(;c>='0'&&c<='9';c=getchar())s=(s<<1)+(s<<3)+(c^'0');
	if(bj)return -s;
	return s;
}
int main()
{
	int i,j;
	LL n,k;
	LL l,r;
	LL s_0;
	n=rin();k=rin();
	for(i=1;i<=n;i++)a[i]=rin();
	sort(a+1,a+n+1);
//	for(i=1;i<=n;i++)printf("%lld ",a[i]);printf("\n");
	l=1,r=n;
	LL n_1=0,n_2=n+1;
	for(;l<=r;){LL mid=(l+r)>>1;if(a[mid]<0)n_1=mid,l=mid+1;else r=mid-1;}
	l=1;r=n;
	for(;l<=r;){LL mid=(l+r)>>1;if(a[mid]>0)n_2=mid,r=mid-1;else l=mid+1;}
	
	LL nam_0=n_2-n_1-1;
	s_0=nam_0*(n-nam_0)+(nam_0*(nam_0-1)/2);
	if(nam_0>0)for(i=n_1+1,j=n_2;j<=n;j++,i++)a[i]=a[j];
	n-=nam_0;
//	printf("n_1:%lld,n_2:%lld\ns_0:%lld\n",n_1,n_2,s_0);
	r=(1LL<<60);
	l=-r;
	LL ans=0;
	for(;l<=r;)
	{
		LL mid=(l+r)>>1;
		LL sum=0;
		int last;
		for(i=1;i<=n_1;i++)
		{
			last=n+1;
			int l_1=1,r_1=n;
			for(;l_1<=r_1;)
			{
				int m_1=(l_1+r_1)>>1;
				if(a[m_1]*a[i]<mid)last=m_1,r_1=m_1-1;
				else l_1=m_1+1;
			}
//			printf("mid:%lld a[%d](%lld)*a[%d](%lld)  sum:%lld-->",mid,i,a[i],last,a[last],sum);
			sum+=n-last+1;
			if(last<=i)sum--;
//			printf("%lld\n",sum);
		}
		
		for(i=n_1+1;i<=n;i++)
		{
			last=0;
			int l_1=1,r_1=n;
			for(;l_1<=r_1;)
			{
				int m_1=(l_1+r_1)>>1;
				if(a[m_1]*a[i]<mid)last=m_1,l_1=m_1+1;
				else r_1=m_1-1;
			}
//			printf("mid:%lld a[%d](%lld)*a[%d](%lld)  sum:%lld-->",mid,i,a[i],last,a[last],sum);
			sum+=last;
			if(last>=i)sum--;
//			printf("%lld\n",sum);
		}
	//	printf("l:%lld,r:%lld,mid:%lld ,sum:%lld\n",l,r,mid,sum);
		sum>>=1;if(mid>0)sum+=s_0;
//		printf("sum:%lld\n",sum);
		if(sum>=k)r=mid-1;
		else ans=mid,l=mid+1;
	}
	printf("%lld",ans);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:9: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   27 |         sort(a+1,a+n+1);
      |         ^~~~
      |         sqrt
Language: Java

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

Compiler output:
Main.java:20: error: incompatible types: possible lossy conversion from long to int
      	System.out.println(a[k-1]);
      	                      ^
1 error
Language: C++

#include "iostream"
#include "vector"
#include "set"
using namespace std;
#define ll long long int
int main()

{
    ll n,m;
    cin>>n>>m;
    ll arr[n];
    for(ll i=0;i<n;i++)
    {
        cin>>arr[i];
    }
    vector<ll> v;
    for(ll i=0;i<n-1;i++)
    {
        for(ll j=i+1;j<n;j++)
        {
            ll k=arr[i]*arr[j];
            v.push_back(k);
        }
    }
    sort(v.begin(),v.end());
    cout<<v[m-1]<<endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:25:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   25 |     sort(v.begin(),v.end());
      |     ^~~~
      |     short
Language: Java

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
       Scanner sc = new Scanner(System.in);
    int n = Integer.parseInt(sc.next());
        int k = Integer.parseInt(sc.next());
        int[] a = new int[n];
        int cnt = 0;
        while(sc.hasNextLine()){
          a[cnt++] = Integer.parseInt(sc.next());
        }
      int[] tmp = new int[a.length*(a.length-1)/2];
    int ans=0;
    int cnt=0;
    for(int i=0;i<a.length-1;i++){
      for(int j=i+1;j<a.length;j++){
        tmp[cnt++] = a[i] * a[j];
      }
    }
    for(int i=0;i<tmp.length;i++){
      int min = Integer.MAX_VALUE;
      for(int j=0;j<tmp.length;j++){
        if( min > tmp[j] ){
          min = tmp[j];
        }
      }
      if( i == k-1 ){
        ans = min;
        break;
      }
      for(int j=0;j<tmp.length;j++){
        if( min == tmp[j] ){
          tmp[j] = Integer.MAX_VALUE;
          break;
        }
      }
    }
    System.out.println(ans);
    }
    
}


Compiler output:
Main.java:14: error: variable cnt is already defined in method main(String[])
    int cnt=0;
        ^
1 error
Language: Java

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
     	Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
      	int k = Integer.parseInt(sc.next());
        int[] A = new int[n];
        int cnt = 0;
      	while(sc.hasNextLine()){
          A[cnt++] = Integer.parseInt(sc.next());
        }
      Pairs(A,k);
    }
  public static void Pairs(int[] a,int k){
     int[] tmp = new int[a.length*(a.length-1)/2];
    int ans=0;
    int cnt=0;
    for(int i=0;i<a.length-1;i++){
      for(int j=i+1;j<a.length;j++){
        tmp[cnt++] = a[i] * a[j];
      }
    }
    for(int i=0;i<tmp.length;i++){
      int min = Integer.MAX_VALUE;
      for(int j=0;j<tmp.length;j++){
        if( min > tmp[j] ){
          min = tmp[j];
        }
      }
      if( i == k-1 ){
        ans = min;
        break;
      }
      for(int j=0;j<tmp.length;j++){
        if( min == tmp[j] ){
          tmp[j] = Integer.MAX_VALUE;
          break;
        }
      }
    }
    System.out.println(ans);
  }


Compiler output:
Main.java:42: error: reached end of file while parsing
  }
   ^
1 error
Language: Java

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
     	Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
      	int k = Integer.parseInt(sc.next());
        int[] A = new int[n];
        int cnt = 0;
      	while(sc.hasNextLine()){
          A[cnt++] = Integer.parseInt(sc.next());
        }
      Tmp tmp = new Tmp();
      tmp.Pairs(A,k);
    }
}
public class Tmp{
  public static void Pairs(int[] a,int k){
     int[] tmp = new int[a.length*(a.length-1)/2];
    int ans=0;
    int cnt=0;
    for(int i=0;i<a.length-1;i++){
      for(int j=i+1;j<a.length;j++){
        tmp[cnt++] = a[i] * a[j];
      }
    }
    for(int i=0;i<tmp.length;i++){
      int min = Integer.MAX_VALUE;
      for(int j=0;j<tmp.length;j++){
        if( min > tmp[j] ){
          min = tmp[j];
        }
      }
      if( i == k-1 ){
        ans = min;
        break;
      }
      for(int j=0;j<tmp.length;j++){
        if( min == tmp[j] ){
          tmp[j] = Integer.MAX_VALUE;
          break;
        }
      }
    }
    System.out.println(ans);
  }
}

Compiler output:
Main.java:16: error: class Tmp is public, should be declared in a file named Tmp.java
public class Tmp{
       ^
1 error
Language: Java

import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
     	Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
      	int k = Integer.parseInt(sc.next());
        int[] A = new int[n];
        int cnt = 0;
      	while(sc.hasNextLine()){
          A[cnt++] = Integer.parseInt(sc.next());
        }
    }
}
public class Tmp{
  public static void Pairs(int[] a,int k){
     int[] tmp = new int[a.length*(a.length-1)/2];
    int ans=0;
    int cnt=0;
    for(int i=0;i<a.length-1;i++){
      for(int j=i+1;j<a.length;j++){
        tmp[cnt++] = a[i] * a[j];
      }
    }
    for(int i=0;i<tmp.length;i++){
      int min = Integer.MAX_VALUE;
      for(int j=0;j<tmp.length;j++){
        if( min > tmp[j] ){
          min = tmp[j];
        }
      }
      if( i == k-1 ){
        ans = min;
        break;
      }
      for(int j=0;j<tmp.length;j++){
        if( min == tmp[j] ){
          tmp[j] = Integer.MAX_VALUE;
          break;
        }
      }
    }
    System.out.println(ans);
  }
}

Compiler output:
Main.java:14: error: class Tmp is public, should be declared in a file named Tmp.java
public class Tmp{
       ^
1 error
Language: Java

import java.util.Scanner;
public class Main { //クラス名はMain
    public static void main(String[] args) {
        //コード
     	Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
      	print(n);
    }
}

Compiler output:
Main.java:7: error: cannot find symbol
      	print(n);
      	^
  symbol:   method print(int)
  location: class Main
1 error
Language: Java

public class Main { //クラス名はMain
    public static void main(String[] args) {
        //コード
     	Scanner sc = new Scanner(System.in);
		int n = Integer.parseInt(sc.next());
      	print(n);
    }
}

Compiler output:
Main.java:4: error: cannot find symbol
     	Scanner sc = new Scanner(System.in);
     	^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
     	Scanner sc = new Scanner(System.in);
     	                 ^
  symbol:   class Scanner
  location: class Main
Main.java:6: error: cannot find symbol
      	print(n);
      	^
  symbol:   method print(int)
  location: class Main
3 errors
Language: C++

#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); ++i)
using namespace std;
typedef long long ll;
typedef pair<int, int> p;
const int inf = 1e9;
const ll mod = 1e9 + 7;
const int dx[] = {1, 0, -1, 0}, dy[] = {0, 1, 0, -1};

int main() {
  int n; ll k;
  cin >> n >> k;
  vector<ll> a(n);
  rep(i,n) cin >> a[i];
  sort(a.begin(), a.end());
  ll l = -INF, r = INF;
  while (l+1 < r) {
    ll x = (l+r) / 2;
    bool ok = [&]{
      ll tot = 0;
      rep(i,n) {
        if (a[i] < 0) {
          int l = -1, r = n;
          while (l+1 < r) {
            int c = (l+r) / 2;
            if (a[c]*a[i] < x) r = c; else l = c;
          }
          tot += n - r;
        } else {
          int l = -1, r = n;
          while (l+1 < r) {
            int c = (l+r) / 2;
            if (a[c] * a[i] < x) l = c; else r = c;
          }
          tot += r;
        }
        if (a[i] * a[i] < x) tot--;
      }
      tot /= 2;
      return tot < k;
    }();
    if (ok) l = x; else r = x;
  }
  cout << l << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:11: error: 'INF' was not declared in this scope
   16 |   ll l = -INF, r = INF;
      |           ^~~
a.cc:17:16: error: 'r' was not declared in this scope
   17 |   while (l+1 < r) {
      |                ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define repo(i,n) for(int i = 1; i < (int)(n); i++)
#define pb push_back
#define mp make_pair
#define np next_permutation
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
#define mod 1000000007
#define pi acos(-1.0)
const ll INF = 1LL<<61;
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }
ll jou(ll N, ll P){if(P==0) return 1;
  if(P%2==0){ll t = jou(N, P/2);return t*t % mod;
  }return (N * jou(N, P-1)) % mod;}  //jou(n,mod-2)で逆元
//intの最大値2147483647 ≒ 2×10^9
//long longの最大値9223372036854775807 ≒ 9×10^18
//'大文字'+=32;    で小文字に
//  cout << fixed << setprecision (20);   小数点以下2０桁まで
//実行時間制約2秒では２×10^8回くらいまで計算できる




int main() {
  ll n,k;
  cin>>n>>k;
  vector<ll> p(n);

  ll pl=0;
  ll mi=0;
  ll zr=0;
  rep(i,n){
    cin>>p[i];
    if(p[i]>0) pl++;
    if(p[i]==0) zr++;
    if(p[i]<0) mi++;
  }

  if(pl*mi<k && k<=pl*mi+pl*zr+mi*zr+zr*(zr-1)/2) {
    cout << 0 << endl;
    return 0;
  }

  sort(all(p));

//————————————————二分探索——————————————————————————
//小さい方からk番目の数x ＝ x以下の数がk個以上あるような最小の数

if(k<=pl*mi){
  ll mid;

  ll ng = -1000000000000000001;
  ll ok = 0;
  while (abs(ok - ng) > 1) {
    mid = (ng + ok) / 2;

    ll cnt=0;
    rep(i,n){
      if(p[i]>0){
        auto x = lb(all(p),mid+p[i]-1/p[i]);
        if(x>=p.end()) cnt+=n;
        else cnt+=x-p.begin();
      }
      if(p[i]<0){
        auto x = ub(all(p),mid/p[i]);
        if(x>=p.end()) ;
        else cnt+=n-(x-p.begin());
      }      
    }

    (cnt>=k? ok : ng) = mid;
  }

  cout << ok << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:84:2: error: expected '}' at end of input
   84 | }
      |  ^
a.cc:32:12: note: to match this '{'
   32 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ld long double
#define rep(i,n) for(int i = 0; i < (int)(n); i++)
#define repo(i,n) for(int i = 1; i < (int)(n); i++)
#define pb push_back
#define mp make_pair
#define np next_permutation
#define lb lower_bound
#define ub upper_bound
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
#define mod 1000000007
#define pi acos(-1.0)
const ll INF = 1LL<<61;
ll gcd(ll x, ll y) { return y ? gcd(y, x % y) : x; }
ll lcm(ll x, ll y) { return x / gcd(x, y) * y; }
ll jou(ll N, ll P){if(P==0) return 1;
  if(P%2==0){ll t = jou(N, P/2);return t*t % mod;
  }return (N * jou(N, P-1)) % mod;}  //jou(n,mod-2)で逆元
//intの最大値2147483647 ≒ 2×10^9
//long longの最大値9223372036854775807 ≒ 9×10^18
//'大文字'+=32;    で小文字に
//  cout << fixed << setprecision (20);   小数点以下2０桁まで
//実行時間制約2秒では２×10^8回くらいまで計算できる




int main() {
  ll n,k;
  cin>>n>>k;
  vector<ll> p(n);

  ll pl=0;
  ll mi=0;
  ll zr=0;
  rep(i,n){
    cin>>p[i];
    if(p[i]>0) pl++;
    if(p[i]==0) zr++;
    if(p[i]<0) mi++;
  }

  if(pl*mi<k && k<=pl*mi+zr*n-zr*zr+zr) {
    cout << 0 << endl;
    return 0;
  }

  sort(all(p));

//————————————————二分探索——————————————————————————
//小さい方からk番目の数x ＝ x以下の数がk個以上あるような最小の数

if(k<=pl*mi){
  ll mid;

  ll ng = -1000000000000000001;
  ll ok = 0;
  while (abs(ok - ng) > 1) {
    mid = (ng + ok) / 2;

    ll cnt=0;
    rep(i,n){
      if(p[i]>0){
        auto x = lb(all(p),mid+p[i]-1/p[i]);
        if(x>=p.end()) cnt+=n;
        else cnt+=x-p.begin();
      }
      if(p[i]<0){
        auto x = ub(all(p),mid/p[i]);
        if(x>=p.end()) ;
        else cnt+=n-(x-p.begin());
      }      
    }

    (cnt>=k? ok : ng) = mid;
  }

  cout << ok << endl;
  return 0;
}


//————————————————二分探索——————————————————————————
//小さい方からk番目の数x ＝ x以下の数がk個以上あるような最小の数

if(k>pl*mi+zr*n-zr*zr+zr){
  ll mid;

  ll ng = 0;
  ll ok = 1000000000000000000;
  while (abs(ok - ng) > 1) {
    mid = (ng + ok) / 2;

    ll cnt=0;
    rep(i,n){
      if(p[i]>0){
        auto x = lb(all(p),mid+p[i]-1/p[i]);
        if(x>=p.end()) cnt+=n;
        else cnt+=x-p.begin();
      }
      if(p[i]<0){
        auto x = ub(all(p),mid/p[i]);
        if(x>=p.end()) ;
        else cnt+=n-(x-p.begin());
      }
      if(p[i]==0) cnt+=n;
      if(p[i]*p[i]<=mid) cnt--;
    }

    //cout << mid << " " << cnt << endl;

    (cnt>=k? ok : ng) = mid;
  }

  cout << ok << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:121:2: error: expected '}' at end of input
  121 | }
      |  ^
a.cc:32:12: note: to match this '{'
   32 | int main() {
      |            ^
Language: C++

/**
 *     author: qodjf
 *     created: 04.21.2020 23:13:45
 */
#include <bits/stdc++.h>
using namespace std;

string to_string(string s) { return '"' + s + '"'; }

string to_string(const char *s) { return to_string((string)s); }

string to_string(bool b) { return (b ? "true" : "false"); }

template <typename A, typename B>
string to_string(pair<A, B> p) {
  return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template <typename A>
string to_string(A v) {
  bool first = true;
  string res = "{";
  for (const auto &x : v) {
    if (!first) {
      res += ", ";
    }
    first = false;
    res += to_string(x);
  }
  res += "}";
  return res;
}

void debug_out() { cerr << endl; }

template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
  cerr << " " << to_string(H);
  debug_out(T...);
}

#ifndef ONLINE_JUDGE
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#else
#define dbg(...) 42
#endif

#define mst(x, a) memset(x, a, sizeof(x))

using ll = long long;
using P = pair<int, int>;
using T = tuple<int, int, int>;
const int INF = 0x3f3f3f3f;
const ll LLINF = 0x3f3f3f3f3f3f3f3f;
const ll MOD = 1e9 + 7;

ll N, K;
vector<ll> negative, positive;
ll zeroCnt, negCnt, posCnt;

ll cntOfProductLessThan(const vector<ll> &A, ll x) {
  ll cnt = 0;
  int rb = 0;
  for (int i = A.size() - 1; i >= 0; i--) {
    rb = min(rb, i);
    while (A[rb] * A[i] <= x && rb < i) rb++;
    cnt += rb;
  }
  return cnt;
}

ll test(ll x) {
  if (x == 0) {
    return zeroCnt * (posCnt + negCnt) + zeroCnt * (zeroCnt - 1) / 2 +
           posCnt * negCnt;
  }
  if (x > 0) {
    return cntOfProductLessThan(positive, x) + cntOfProductLessThan(negative, x) + test(0);
  }

  ll cnt = 0;
  int lb = negCnt - 1;
  for (int i = positive.size() - 1; i >= 0; i--) {
    while (positive[i] * negative[lb] <= x && lb >= 0) lb--;
    cnt += negCnt - 1 - lb;
  }
  return cnt;
}

void solve() {
  sort(positive.begin(), positive.end());
  sort(negative.rbegin(), negative.rend());

  ll lo = -1e18 - 10, hi = 1e18 + 10;
  while (lo + 1 < hi) {
    ll mi = lo + (hi - lo) / 2;
    // product <= x is >= K
    if (test(mi) >= K) {
      hi = mi;
    } else {
      lo = mi;
    }
  }
  cout << hi << endl;
}

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

  cin >> N >> K;
  for (int i = 0; i < N; i++) {
    int a;
    cin >> a;
    if (a > 0) {
      positive.push_back(a);
    } else if (a < 0) {
      negative.push_back(a);
    }
  }
  posCnt = positive.size();
  negCnt = negative.size();
  zeroCnt = N - posCnt - negCnt;
  solve();
}
G

Compiler output:
a.cc:126:1: error: 'G' does not name a type
  126 | G
      | ^
Language: C++

#inlude <bits/stdc++.h>
using namespace std;
long long a[1000000000],b[1000000000];
int main()
{
  int n,k;
  cin>>n>>k;
  for(int i=0;i<n;i++)
    cin>>a[i];
  int nas=0;
  for(int i=0;i<n;i++)
  {
	for(int j=i+1;j<n-i;j++)
    {
		 nas++;
     	 if(nas==k)
         {
         cout<<a[i]*a[j];
      	 return 0;
         }
    }
  return 0;
  }

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inlude; did you mean #include?
    1 | #inlude <bits/stdc++.h>
      |  ^~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:7:3: error: 'cin' was not declared in this scope
    7 |   cin>>n>>k;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | #inlude <bits/stdc++.h>
a.cc:18:10: error: 'cout' was not declared in this scope
   18 |          cout<<a[i]*a[j];
      |          ^~~~
a.cc:18:10: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:23:4: error: expected '}' at end of input
   23 |   }
      |    ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
    long n,k;
    cin >> n >> k;
    long a[n];
    for(int i=0;i<n;i++)cin >> a[i];
    vector<long>minus;
    vector<long>zero;
    vector<long>plus;
    for(int i=0;i<n;i++){
        if(a[i]<0)minus.push_back(a[i]);
        else if(a[i]==0)zero.push_back(a[i]);
        else plus.push_back(a[i]);
    }
    long minusPair = minus.size();
    long zeroPair = zero.size();
    minusPair *= plus.size();
    zeroPair *= minus.size() + plus.size();
    zeroPair += zero.size() * (zero.size()-1) / 2;



    
    long plusPair = n*(n-1)/2 - minusPair - zeroPair;


    sort(plus.begin(),plus.end());
    sort(minus.begin(),minus.end(),greater<long>());
    long ans = 0;

    if(k <= minusPair){

        long left = -1e18;
        long right = -1;
        long mid = (left+right)/2) - 1;


        while(left != right){

            mid = (left+right)/2;

        long tmp = minusPair;

        int j = 0;
        for(int i=0;i<plus.size();i++){
            while(j<minus.size() && plus[i] * minus[j] > mid)j++;
            tmp -= j;
        }
            

            if(tmp >= k){
                right = mid;
            }else{

                left = mid+1;
            }

            ans = left;
            
        }
        
    }else if(k <= minusPair + zeroPair){
        ans = 0;
    }else{
        long left = 1;
        long right = 1e18;
        long mid = (left+right)/2;
        while(left != right){

            mid = (left+right)/2;
            long tmp = minusPair + zeroPair;
            
            int j=0;
            int ps = plus.size();
            int ms = minus.size();
            if(ps >= 2){
                for(int i=ps-1;i>0;i--){


                  while(j < ps && plus[i]*plus[j] <= mid){
                      j++;
                  }
                  tmp += min(i,j);
                }
            }
            

            j=0;

            if(ms>= 2){
                for(int i=ms-1;i>0;i--){

                  while(j < ms && minus[i]*minus[j] <= mid){
                      j++;
                  }
                  tmp += min(i,j);

                }
            }


            if(tmp >= k){

                right = mid;
            }else{
                

                left = mid+1;
                
            }


        }
        ans = left;

    }
    
    cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:34: error: expected ',' or ';' before ')' token
   36 |         long mid = (left+right)/2) - 1;
      |                                  ^
Language: C++

import numpy as np
n,k = map(int,input().split())
a = np.array(list(map(int,input().split())))
a.sort()
posi = a[a>0]
zero = a[a==0]
nega = a[a<0]

def cnt(x):
    c = 0
    if x >= 0:
        c += len(zero)*n
    c += np.searchsorted(a, x // posi, side = 'right').sum()
    c += n-np.searchsorted(a, (- x - 1) // (-nega), side = 'right').sum()
    c -= np.count_nonzero(a * a <= x)
    return c // 2

l = - 10 ** 18
r = 10 ** 18
while l + 1 < r:
    m = (l + r) // 2
    if cnt(m) < k:
        l = m
    else:
        r = m
print(r)

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import numpy as np
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: C++

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

using namespace std;

int main()
{ int n;
  cin>>n;
 int k;
 cin>>k;
 long a[n];
 while(n--)
 {cin>>a[n];
 }
 int p=(n*(n-1))/2;
  long long b[p];
  int flag=0;
  //int count=0;
  for(int r=0;r<p;r++)
  {for(int i=0;i<n-1;i++)
  { for(int j=i+1;j<n;j++ )
    {
      b[r] =a[i]*a[j];

    }


  }
  }
  b.sort();
  cout<<b[k-1];

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:5: error: request for member 'sort' in 'b', which is of non-class type 'long long int [p]'
   30 |   b.sort();
      |     ^~~~
Language: C++

#include <iostream>
#include <iomanip>
#include <string>
#include <vector>
#include <algorithm>
#include <numeric>
#include <utility>
#include <cmath>
#include <tuple>
#include <queue>
#include <bitset>
#include <set>
#include <map>
#include <list>

using namespace std;



int main(){
  int N, K;
  cin >> N >> K;
  vector<long long> A(N);

  for (int i = 0; i < N; ++i) {
    cin >> A.at(i);
  }

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

  // x以下の組(n)がK以上ならばtrue
  auto isOK = [&] (long long x) {
    long long n = 0;
    for (const auto a : A) {
      if (a > 0) {
        if (x < 0) {
          n += static_cast<long long>(upper_bound(A.begin(), A.end(), (x-a+1)/a) - A.begin()); //x=-4,-5,-6 a=3 then b<=-2
        } else {
          n += static_cast<long long>(upper_bound(A.begin(), A.end(), x/a) - A.begin()); // x=6,7,8 a=3 then b<=2
        }
      } else if (a < 0) {
        if (x < 0) {
          n += N - static_cast<long long>(lower_bound(A.begin(), A.end(), (x+a+1)/a) - A.begin()); // x=-4,-5,-6 a=-3 then b>=2
        }else {
          n += N - static_cast<long long>(lower_bound(A.begin(), A.end(), x/a) - A.begin()); // x=6,7,8 a=-3 then b>=-2
        }
      } else {
        if (x >= 0) n += N;
      }
      if (a*a <= x) n--;
    }
    assert(n%2==0);
    return n/2 >= K;
  };

  long long ng, ok, mid;
  ng = -1000000000000000001;  // 必ずK番目にくる数より小さい
  ok = 1000000000000000001;  // 必ずK番目にくる数以上
  // 小さい方からK番目にくる数以上の最小(=K番目にくる数)を求める。
  while(abs(ok-ng) > 1) {
    mid = (ng + ok) / 2;
    if (isOK(mid)) {
      ok = mid;
    } else {
      ng = mid;
    }
  }

  std::cout << ok << std::endl;

  return 0;
}


Compiler output:
a.cc: In lambda function:
a.cc:52:5: error: 'assert' was not declared in this scope
   52 |     assert(n%2==0);
      |     ^~~~~~
a.cc:15:1: note: 'assert' is defined in header '<cassert>'; this is probably fixable by adding '#include <cassert>'
   14 | #include <list>
  +++ |+#include <cassert>
   15 |
Language: C++

#include<bits/stdc++.h>
using namespace std ;
  
int main()
{ int N, K, x, p=1 ;
  cin>>N>>K ;
  int A[N] ;
  for(int i=0; i<N; i++)
  {  cin>>A[i] ;
  }
  Sort(A, A+N) ;  
  for(int j=0; j<N; j++)
  {  for(int k=j; k<N; k++)
     { x=A[j]*A[k] ;
       p++ ;
       if(p==K)
         cout<<x ;
       else
         continue ;
     }
  }
  return 0 ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:3: error: 'Sort' was not declared in this scope
   11 |   Sort(A, A+N) ;
      |   ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std
  
int main()
{ int N, K, x, p=1 ;
  cin>>N>>K ;
  int A[N] ;
  for(int i=0; i<N; i++)
  {  cin>>A[i] ;
  }
  Sort(A, A+N) ;  
  for(int j=0; j<N; j++)
  {  for(int k=j; k<N; k++)
     { x=A[i]*A[j] ;
       p++ ;
       if(p==K)
         cout<<x ;
       else
         continue ;
     }
  }
  return 0 ;
}

Compiler output:
a.cc:2:20: error: expected ';' before 'int'
    2 | using namespace std
      |                    ^
      |                    ;
    3 | 
    4 | int main()
      | ~~~                 
a.cc: In function 'int main()':
a.cc:11:3: error: 'Sort' was not declared in this scope
   11 |   Sort(A, A+N) ;
      |   ^~~~
a.cc:14:12: error: 'i' was not declared in this scope
   14 |      { x=A[i]*A[j] ;
      |            ^
Language: C

#include<iostream>
using namespace std;

void Swap(int &x, int &y){
	int temp = x;
	x = y;
	y = temp;
}

void Sort(int *arr, int len){
	for(int i = 0; i < len - 1; ++i){
		for(int j = 0; j < len - i - 1; ++j){
			if(arr[j] > arr[j+1])
				Swap(arr[j], arr[j+1]);	
		}
	}
}

int main(){

	int lenB;
	int len;
	cin >> lenB;
	len = (lenB >= 2 || lenB <= 200000 ? lenB : 2);
	
	int kB;
	int k;
	cin >> kB;
	k = (kB >= 1 || kB <= len / 2 * (len - 1) ? kB : 1);

	int *arr = new int[len];
	for(int i = 0; i < len; ++i)
		cin >> arr[i];

	int length = 0;
	for(int i = 0; i < len - 1; ++i){
		for(int j = i + 1; j < len; ++j)
			++length;
	}

	int count = 0;
	int *resArr = new int[length];

	for(int i = 0; i < len - 1; ++i){
		for(int j = i + 1; j < len; ++j)
			resArr[count++] = arr[i] * arr[j];
	}

	Sort(resArr, length);

	for(int i = 0; i < length; ++i){
		if(i == k - 1){
			break;
		}
	}
	cout << resArr[k - 1] << endl;

	delete[] arr;
	delete[] resArr;

	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>
using namespace std;
int main() {
    int N;
    long long int K;
    cin >> N >> K;
    long long int A[N];
    int i,j;
    for(i=0;i<N;i++)cin >> A[i];
    sort(A,A+N);
    int plus=0;
    int zero=0;
    int minus=0;
    long long int pair_pl,pair_zr,pair_mn;
    for(i=0;i<N;i++){
        if(A[i]<0)minus++;
        else if(A[i]==0)zero++;
        else if(A[i]>0)plus++;
    }
    pair_pl=minus*(minus-1)+plus*(plus-1);
    pair_zr=zero*(plus+minus+zero-1);
    pair_mn=plus*minus;
    if(K<=pair_mn){
        long long int min = A[0]*A[N-1];
        long long int max = 0;
        long long int mid = (max+min)/2;
        while(max!=min){
            mid = (max+min)/2;
            long long int count = 0;
            int tmp = N-1;      
            for(i=0;i<minus;i++){
                int flag =0; 
                for(j=tmp;j>N-1-plus;j--){
                    if(A[i]*A[j]>mid){
                        flag++;
                        tmp=j+1;
                        count+=(N-1-j);
                        break;
                    }
                }
                if(flag==0)count+=plus;
                if(count>K)break;
            }
            if(count<=K)min=mid;
            if(count>=K)max=mid;
        }
        cout << mid << endl;
    }
    else if(K<=pair_mn+pair_zr)cout << 0 << endl; 
    else{
        long long int ans = K-(pair_mn+pair_zr);
        long long int MIN = 0;
        long long int MAX = max(A[N-1]*A[N-1],A[0]*A[0]);
        while(MAX!=MIN){
            long long int mid = (MAX+MIN)/2;
            long long int count = 0;
            int tmp = minus-1;      
            for(i=0;i<minus;i++){
                int flag=0; 
                for(j=tmp;j>i;j--){
                    if(A[i]*A[j]>mid){
                        flag++;
                        tmp=j+1;
                        count+=(minus-1-j);
                        break;
                    }
                }
                if(flag==0)count+=(minus-1-i);
                if(count>ans)break;
            }
            tmp = N-1-plus;
            for(i=N-1;i>N-1-plus;i--){
                flag=0; 
                for(j=tmp;j<i;j++){
                    if(A[i]*A[j]>mid){
                        flag++;
                        tmp=j-1;
                        count+=(j-(N-1-plus));
                        break;
                    }
                }
                if(flag==0)count+=(i-(N-1-plus));
                if(count>ans)break;
            }            
            if(count<=ans)MIN=mid;
            if(count>=ans)MAX=mid;
        }
        cout << MAX << endl;
    }
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:73:17: error: 'flag' was not declared in this scope
   73 |                 flag=0;
      |                 ^~~~
Language: C++

#include <stdio.h>
#include<iostream>
#include<algorithm>
using namespace std;
const int maxn = 100000; 
long long a[maxn],s[maxn];
bool cmp(int x, int y)
{
    return x < y;
}
int main()
{
 
    int n, k,cn=0;
    while (cin >> n >> k)
    {
        for (int i = 0; i < n; i++)
            cin >> a[i];
        for ( i = 0; i < n; i++)
        {
            for (int j = i + 1; j < n; j++)
            {
                s[cn++] = a[i] * a[j];
            }
        }
        sort(s, s + cn, cmp);
        cout << s[k - 1] << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:15: error: 'i' was not declared in this scope
   19 |         for ( i = 0; i < n; i++)
      |               ^
Language: C++

#include<iostream>
#include<algorithm>

using namespace std;
int main()
{
long	int n,k,i,j,c=0;
	long long int b[1000000000000000000];
	cin>>n>>k;
	long int a[n];
	for(i=0;i<n;i++)
	cin>>a[i];
	

	int m=0,j=1;
	while(j<n && m<n)
	{
		b[c]=a[j]*a[m];
		c++;
		j++;
		if(j==n)
		{
			m=m+1;
			j=m+1;
		}
	}
//	cout<<c<<endl;
//	for(i=0;i<c;i++)
//	cout<<b[i]<<" ";
	sort(b,b+c);
	cout<<b[k-1];
	
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:17: error: conflicting declaration 'int j'
   15 |         int m=0,j=1;
      |                 ^
a.cc:7:19: note: previous declaration as 'long int j'
    7 | long    int n,k,i,j,c=0;
      |                   ^