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

#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
long M=1e9+7;
int main(){
ll n,k;
  cin>>n>>k;
ll a[n];
ll   r=n-1;
ll ans=1;
  for(ll i=0;i<n;i++)
cin>>a[i];
  sort(a,a+n);
  if(k%2)
{ans=a[r];
r--;
k--;
b=(ans<0?-1:1);
}
  while(k){
    x=a[l]*a[l+1],y=a[r]*a[r-1];
    if(x*b>y*b)ans*=x%M,ans%=M,l+=2;
    else ans*=y%M,ans%=M,r-=2;
    k-=2;
  }
  cout<<(ans+M)%M<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:1: error: 'b' was not declared in this scope
   18 | b=(ans<0?-1:1);
      | ^
a.cc:21:5: error: 'x' was not declared in this scope
   21 |     x=a[l]*a[l+1],y=a[r]*a[r-1];
      |     ^
a.cc:21:9: error: 'l' was not declared in this scope
   21 |     x=a[l]*a[l+1],y=a[r]*a[r-1];
      |         ^
a.cc:21:19: error: 'y' was not declared in this scope
   21 |     x=a[l]*a[l+1],y=a[r]*a[r-1];
      |                   ^
a.cc:22:10: error: 'b' was not declared in this scope
   22 |     if(x*b>y*b)ans*=x%M,ans%=M,l+=2;
      |          ^
Language: C++

#include<bits/stdc++.h>
typedef long long ll;
using namespace std;
long M=1e9+7;
int main(){
  cin>>n>>k;
ll   r=n-1;
  for(ll i=0;i<n;i++)
cin>>a[i];
  sort(a,a+n);
  if(k%2)
{ans=a[r];
r--;
k--;
b=(ans<0?-1:1);
}
  while(k){
    x=a[l]*a[l+1],y=a[r]*a[r-1];
    if(x*b>y*b)ans*=x%M,ans%=M,l+=2;
    else ans*=y%M,ans%=M,r-=2;
    k-=2;
  }
  cout<<(ans+M)%M<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:8: error: 'n' was not declared in this scope; did you mean 'yn'?
    6 |   cin>>n>>k;
      |        ^
      |        yn
a.cc:6:11: error: 'k' was not declared in this scope
    6 |   cin>>n>>k;
      |           ^
a.cc:9:6: error: 'a' was not declared in this scope
    9 | cin>>a[i];
      |      ^
a.cc:10:8: error: 'a' was not declared in this scope
   10 |   sort(a,a+n);
      |        ^
a.cc:12:2: error: 'ans' was not declared in this scope; did you mean 'abs'?
   12 | {ans=a[r];
      |  ^~~
      |  abs
a.cc:15:1: error: 'b' was not declared in this scope
   15 | b=(ans<0?-1:1);
      | ^
a.cc:18:5: error: 'x' was not declared in this scope
   18 |     x=a[l]*a[l+1],y=a[r]*a[r-1];
      |     ^
a.cc:18:9: error: 'l' was not declared in this scope
   18 |     x=a[l]*a[l+1],y=a[r]*a[r-1];
      |         ^
a.cc:18:19: error: 'y' was not declared in this scope
   18 |     x=a[l]*a[l+1],y=a[r]*a[r-1];
      |                   ^
a.cc:19:10: error: 'b' was not declared in this scope
   19 |     if(x*b>y*b)ans*=x%M,ans%=M,l+=2;
      |          ^
a.cc:19:16: error: 'ans' was not declared in this scope; did you mean 'abs'?
   19 |     if(x*b>y*b)ans*=x%M,ans%=M,l+=2;
      |                ^~~
      |                abs
a.cc:20:10: error: 'ans' was not declared in this scope; did you mean 'abs'?
   20 |     else ans*=y%M,ans%=M,r-=2;
      |          ^~~
      |          abs
a.cc:23:10: error: 'ans' was not declared in this scope; did you mean 'abs'?
   23 |   cout<<(ans+M)%M<<endl;
      |          ^~~
      |          abs
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define int long long
int n,a,k;
vector<int> value;
const int MOD=1e9+7;
/*
  6 4
  1 2 -1 -3 -6 4
*/

productOf_K_elements(){


    int product = 1;

    //case 1

    if(value[n-1]==0 and k%2 != 0){
        return 0;
    }

    //case 2

    if(value[n-1]<0 and k%2 != 0){

//        reverse(value.begin(),value.end());
        for(int i=n-1; i>=n-k; i--){
            product *= value[i];
            product =  ((product%MOD)+MOD )%MOD;
        }

        return product;
    }

    //case 3

    int left_side  = 0;
    int right_side = n - 1;

    if(value[n-1]>0 and k%2 != 0){
        product = (product%MOD * value[n-1]%MOD)%MOD;
        k--;
        right_side--;
    }




     k = k/2;

     for(int i=0; i<k; i++){

          int left =  (value[left_side]%MOD * value[left_side+1]%MOD)%MOD;
          int right = (value[right_side]%MOD * value[right_side-1]%MOD)%MOD;



          if(left>right){
             product = ((product * left)%MOD + MOD)%MOD;
             left_side+=2;
          }
          else{
            product = ((product * right)%MOD + MOD)%MOD;
            right_side-=2;
          }

          //cout<<MOD<<endl;
          //product = (product%MOD)+MOD;
     }

     return product;





}


int32_t main()
{


    cin>>n>>k;

    for(int i=0; i<n; i++){
        cin>>a;
        value.push_back(a);
    }

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

    cout<<productOf_K_elements()<<endl;

    return 0;

}



Compiler output:
a.cc:12:1: error: ISO C++ forbids declaration of 'productOf_K_elements' with no type [-fpermissive]
   12 | productOf_K_elements(){
      | ^~~~~~~~~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
#define rep(i,n,m) for(int i = (n); i <(m); i++)
#define rrep(i,n,m) for(int i = (n) - 1; i >=(m); i--)
#define pvec(vec) {for (auto v: vec) cout << v << ' '; cout << endl;}
#define pivec(vec) {rep(i, 0, vec.size()) cout << i << ':' << vec[i] << ' '; cout << endl;}
#define iint int
#define int ll

using namespace std;
using ll = long long;

const ll MOD = 1000000007;

iint main()
{
    ll N, K;
    cin >> N >> K;

    if (N == K)
    {
        ll ret = 1;
        rep(i, 0, N)
        {
            ll A;
            cin >> A ;
            ret *= A;
            ret %= MOD;
        }
        cout << ret << endl;
        return 0;
    }

    vector<ll> plus, minus;
    int num_zero = 0;
    rep(i, 0, N) 
    {
        ll A;
        cin >> A;
        if (A >= 0) plus.push_back(A);
        else minus.push_back(A);
    }

    sort(plus.rbegin(), plus.rend());
    sort(minus.begin(), minus.end());

   if (plus.size() == 0 and (K&1))
    {
        vector<ll> all_nums(minus);
        sort(all_nums.rbegin(), all_nums.rend());
 
        ll ret = 1;
        rep(i, 0, K)
        {
            ret *= all_nums[i];
            ret %= MOD;
        }
        if (ret < 0) ret += MOD;
        cout << ret << endl;
        return 0;
    }

    // answer is non-negative
    ll ret = 1;
    int cnt = K;
    int ppos, mpos;
    ppos = mpos = 0;

    if ((cnt&1) and plus.size()>0)
    {
        ret *= plus[ppos++];
        --cnt;
    }

    while (cnt > 0)
    {
        ll plus_mul=0, minus_mul = 0;
        
        if (ppos+1 < plus.size())
            plus_mul = plus[ppos] * plus[ppos+1];
        if (mpos+1 < minus.size())
            minus_mul = minus[mpos] * minus[mpos+1];

        if (plus_mul >= minus_mul)
        {
            ret *= (plus_mul%MOD);
            ret %= MOD;
            ppos += 2;
        }
        else
        {
            ret *= (minus_mul%MOD);
            ret %= MOD;
            mpos += 2;
        }

        cnt -= 2;
    }

    cout << ret << endl;
    return 0;
}


Compiler output:
a.cc:7:13: error: '::main' must return 'int'
    7 | #define int ll
      |             ^~
a.cc:6:14: note: in expansion of macro 'int'
    6 | #define iint int
      |              ^~~
a.cc:14:1: note: in expansion of macro 'iint'
   14 | iint main()
      | ^~~~
Language: C++

#include<bits/stdc++.h>
#define rep(i,n,m) for(int i = (n); i <(m); i++)
#define rrep(i,n,m) for(int i = (n) - 1; i >=(m); i--)
#define pvec(vec) {for (auto v: vec) cout << v << ' '; cout << endl;}
#define pivec(vec) {rep(i, 0, vec.size()) cout << i << ':' << vec[i] << ' '; cout << endl;}
#define int ll

using namespace std;
using ll = long long;

const ll MOD = 1000000007;

int main()
{
    ll N, K;
    cin >> N >> K;

    if (N == K)
    {
        ll ret = 1;
        rep(i, 0, N)
        {
            ll A;
            cin >> A ;
            ret *= A;
            ret %= MOD;
        }
        cout << ret << endl;
        return 0;
    }

    vector<ll> plus, minus;
    int num_zero = 0;
    rep(i, 0, N) 
    {
        ll A;
        cin >> A;
        if (A >= 0) plus.push_back(A);
        else minus.push_back(A);
    }

    sort(plus.rbegin(), plus.rend());
    sort(minus.begin(), minus.end());

   if (plus.size() == 0 and (K&1))
    {
        vector<ll> all_nums(minus);
        sort(all_nums.rbegin(), all_nums.rend());
 
        ll ret = 1;
        rep(i, 0, K)
        {
            ret *= all_nums[i];
            ret %= MOD;
        }
        if (ret < 0) ret += MOD;
        cout << ret << endl;
        return 0;
    }

    // answer is non-negative
    ll ret = 1;
    int cnt = K;
    int ppos, mpos;
    ppos = mpos = 0;

    if ((cnt&1) and plus.size()>0)
    {
        ret *= plus[ppos++];
        --cnt;
    }

    while (cnt > 0)
    {
        ll plus_mul=0, minus_mul = 0;
        
        if (ppos+1 < plus.size())
            plus_mul = plus[ppos] * plus[ppos+1];
        if (mpos+1 < minus.size())
            minus_mul = minus[mpos] * minus[mpos+1];

        if (plus_mul >= minus_mul)
        {
            ret *= (plus_mul%MOD);
            ret %= MOD;
            ppos += 2;
        }
        else
        {
            ret *= (minus_mul%MOD);
            ret %= MOD;
            mpos += 2;
        }

        cnt -= 2;
    }

    cout << ret << endl;
    return 0;
}


Compiler output:
a.cc:6:13: error: '::main' must return 'int'
    6 | #define int ll
      |             ^~
a.cc:13:1: note: in expansion of macro 'int'
   13 | int main()
      | ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long ll;
typedef pair<ll,ll> P;
const ll mod=1000000007;
const ll LINF=1LL<<60;
const int INF=1<<30;
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; }

int main(){
	ll n,k;cin>>n>>k;
	vector<ll> po;
	vector<ll> ne;
	ll cnt_zero = 0;
	for(ll i = 0; i < n; i++) {
		ll x;cin>>x;
		if (x > 0){
			po.pb(x);
		}
		else if(x != 0){
			ne.pb(x);
		}
		else{
			cnt_zero++;
		}
	}
	ll po_len = po.size();
	ll ne_len = ne.size();

	

	k -= cnt_zero;
	

	// for(int i = 0; i < po_len; i++) {
	// 	cout << ne[i] << endl;
	// }
	


	if (k == po_len + ne_len){

		sort(ALL(po),greater<ll>());
		sort(ALL(ne));
		vector<ll> sum_po(po_len+1,1LL);
		vector<ll> sum_ne(ne_len+1,1LL);

		for(ll i = 0; i < po_len; i++) {
			sum_po[i+1] = sum_po[i] * po[i];
			sum_po[i+1] %= mod;
		}
		for(ll i = 0; i < ne_len; i++) {
			sum_ne[i+1] = sum_ne[i] * ne[i];
			sum_ne[i+1] %= mod;
			if(sum_ne[i+1] < 0LL){
				sum_ne[i+1] += mod;
			}
		}

		if (cnt_zero != 0LL){
			cout << 0 << endl;
		}
		else{
			if (po_len == 0){
				cout << sum_ne[ne_len] << endl;
			}
			else if (ne_len == 0){
				cout << sum_po[po_len] << endl;
			}
			else{
				cout << (sum_po[po_len] * sum_ne[ne_len]) % mod << endl;
			}
		}
		return 0;
	}
	
	else if (k % 2 == 1 && po_len == 0){
		ll res;
		sort(ALL(ne),greater<ll>());
		vector<ll> sum_ne(ne_len+1,1LL);
		for(ll i = 0; i < ne_len; i++) {
			sum_ne[i+1] = sum_ne[i] * ne[i];
			sum_ne[i+1] %= mod;
		// 	if(sum_ne[i+1] < 0LL){
		// 	sum_ne[i+1] += mod;
		// }
		}
		if (cnt_zero != 0){
			res = max(0LL,sum_ne[k]);
		}
		else{
			res = sum_ne[k];
		}
		if(res < 0LL){
			res += mod;
		}
		cout << res << endl;
		return 0;
	}
	else{
		sort(ALL(po),greater<ll>());
		sort(ALL(ne));
		ll ans = 1LL;
		ll id_p = 0;
		ll id_n = 0;
		ll element = 0;
		// if (k % 2 == 1){
		// 	ans *= po[0];
		// 	id_p++;
		// 	element++;
		// }
		while(element < k){
			if(element < k -1 && id_n + 1< ne_len && (id_p >= po_len +1||(id_p < po_len + 1 && po[id_p] * po[id_p +1] <= ne[id_n] * ne[id_n+1]))){
				ans *= ne[id_n] %mod;
				ans *= ne[id_n + 1]%mod;
				id_n += 2;
				element+=2;
			}
			else{
				ans *= po[id_p]%mod;
				id_p += 1;
				element+= 1;
			}
			ans %= mod;
			if(ans < 0){
				ans += mod;
			}
		}
		cout << ans << endl;
	}
		
	}




	return 0;
}


Compiler output:
a.cc:145:9: error: expected unqualified-id before 'return'
  145 |         return 0;
      |         ^~~~~~
a.cc:146:1: error: expected declaration before '}' token
  146 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long ll;
typedef pair<ll,ll> P;
const ll mod=1000000007;
const ll LINF=1LL<<60;
const int INF=1<<30;
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; }

int main(){
	ll n,k;cin>>n>>k;
	vector<ll> po;
	vector<ll> ne;
	ll cnt_zero = 0;
	for(ll i = 0; i < n; i++) {
		ll x;cin>>x;
		if (x > 0){
			po.pb(x);
		}
		else if(x != 0){
			ne.pb(x);
		}
		else{
			cnt_zero++;
		}
	}
	ll po_len = po.size();
	ll ne_len = ne.size();

	

	k -= cnt_zero;
	

	// for(int i = 0; i < po_len; i++) {
	// 	cout << ne[i] << endl;
	// }
	


	if (k == po_len + ne_len){

		sort(ALL(po),greater<ll>());
		sort(ALL(ne));
		vector<ll> sum_po(po_len+1,1LL);
		vector<ll> sum_ne(ne_len+1,1LL);

		for(ll i = 0; i < po_len; i++) {
			sum_po[i+1] = sum_po[i] * po[i];
			sum_po[i+1] %= mod;
		}
		for(ll i = 0; i < ne_len; i++) {
			sum_ne[i+1] = sum_ne[i] * ne[i];
			sum_ne[i+1] %= mod;
			if(sum_ne[i+1] < 0LL){
				sum_ne[i+1] += mod;
			}
		}

		if (cnt_zero != 0LL){
			cout << 0 << endl;
		}
		else{
			if (po_len == 0){
				cout << sum_ne[ne_len] << endl;
			}
			else if (ne_len == 0){
				cout << sum_po[po_len] << endl;
			}
			else{
				cout << (sum_po[po_len] * sum_ne[ne_len]) % mod << endl;
			}
		}
		return 0;
	}
	
	else if (k % 2 == 1 && po_len == 0){
		ll res;
		sort(ALL(ne),greater<ll>());
		vector<ll> sum_ne(ne_len+1,1LL);
		for(ll i = 0; i < ne_len; i++) {
			sum_ne[i+1] = sum_ne[i] * ne[i];
			sum_ne[i+1] %= mod;
		// 	if(sum_ne[i+1] < 0LL){
		// 	sum_ne[i+1] += mod;
		// }
		}
		if (cnt_zero != 0){
			res = max(0LL,sum_ne[k]);
		}
		else{
			res = sum_ne[k];
		}
		if(res < 0LL){
			res += mod;
		}
		cout << res << endl;
		return 0;
	}
	else{
		sort(ALL(po),greater<ll>());
		sort(ALL(ne));
		ll ans = 1LL;
		ll id_p = 0;
		ll id_n = 0;
		ll element = 0;
		// if (k % 2 == 1){
		// 	ans *= po[0];
		// 	id_p++;
		// 	element++;
		// }
		while(element < k){
			if(element < k -1 && id_n + 1< ne_len && (id_p >= po_len +1||(id_p < po_len + 1 && po[id_p] * po[id_p +1] <= ne[id_n] * ne[id_n+1]))){
				ans *= ne[id_n] %mod;
				ans *= ne[id_n + 1]%mod;
				id_n += 2;
				element+=2;
			}
			else{
				ans *= po[id_p]%mod;
				id_p += 1;
				element+= 1;
			}
			ans %= mod;
			if(ans < 0){
				ans += mod;
			}
		}
	}
		cout << ans << endl;
	}




	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:138:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
  138 |                 cout << ans << endl;
      |                         ^~~
      |                         abs
a.cc: At global scope:
a.cc:144:9: error: expected unqualified-id before 'return'
  144 |         return 0;
      |         ^~~~~~
a.cc:145:1: error: expected declaration before '}' token
  145 | }
      | ^
Language: C++

#include <algorithm>
#include <iostream>
#include <cstring>
#include <cstdio>
#include <ctime>
#include <windows.h>

#define LL long long
#define int long long
#define Maxn 200010

using namespace std;

const LL MOD = 1ll * (1e9 + 7);

inline LL read() {
    LL x = 0, f = 1;
    char c = getchar();
    while(c < '0' || c > '9') {
        if(c == '-') f = -1;
        c = getchar();
    }
    while('0' <= c && c <= '9') {
        x = x * 10 + c - '0';
        c = getchar();
    }
    return x * f;
}

int n, k;
LL a[Maxn];

int cmp(LL fir, LL sec) {
    LL absfir = fir > 0 ? fir : -fir;
    LL abssec = sec > 0 ? sec : -sec;
    return absfir > abssec; 
}

signed main() {
    n = read(); k = read();
    bool flag = 1;
    for(int i = 1; i <= n; ++i) {
        a[i] = read();
        if(a[i] > 0) flag = 0;
    }
    sort(a + 1, a + n + 1, cmp);
    LL ans = 1, cnt = 0;
    if(flag && k % 2) {
        for(int i = n; i >= n - k + 1; --i) ans = ans * a[i] % MOD;
        cout << (ans % MOD + MOD) % MOD << endl;
        return 0;
    }
    for(int i = 1; i <= k; ++i) if(a[i] < 0) ++cnt;
    if(cnt % 2 == 0) {
        for(int i = 1; i <= k; ++i) ans = ans * a[i] % MOD;
        cout << ans << endl;
        Sleep(3000);
        return 0;
    }
    else {
        LL p1 = 0, q1 = 0, p2 = 0, q2 = 0;
        for(int i = k + 1; i <= n; ++i) if(a[i] >= 0) {q1 = a[i]; break;}
        for(int i = k; i >= 1; --i) if(a[i] <= 0) {p1 = -a[i]; break;}
        for(int i = k + 1; i <= n; ++i) if(a[i] <= 0) {q2 = -a[i]; break;}
        for(int i = k; i >= 1; --i) if(a[i] >= 0) {p2 = a[i]; break;}
        if(!q2 || !p2 || q1 * p2 > p1 * q2) {
            // cout << "debug1" << endl;
            bool flag = 1;
            for(int i = k; i >= 1; --i) {
                if(a[i] < 0 && flag) {flag = 0; continue;}
                ans = ans * a[i] % MOD;
            }
            for(int i = k + 1; i <= n; ++i) if(a[i] >= 0) {ans = ans * a[i] % MOD; break;}
        }
        else {
            // cout << "debug2" << endl;
            bool flag = 1;
            for(int i = k; i >= 1; --i) {
                if(a[i] > 0 && flag) {flag = 0; continue;}
                ans = ans * a[i] % MOD;
            }
            for(int i = k + 1; i <= n; ++i) if(a[i] <= 0) {ans = ans * a[i] % MOD; break;}
        }
        cout << ans << endl;
    }
    return 0;
}

Compiler output:
a.cc:6:10: fatal error: windows.h: No such file or directory
    6 | #include <windows.h>
      |          ^~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long ll;
typedef pair<ll,ll> P;
const ll mod=1000000007;
const ll LINF=1LL<<60;
const int INF=1<<30;
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; }

int main(){
	ll n,k;cin>>n>>k;
	vector<ll> po;
	vector<ll> ne;
	ll cnt_zero = 0;
	for(ll i = 0; i < n; i++) {
		ll x;cin>>x;
		if (x > 0){
			po.pb(x);
		}
		else if(x != 0){
			ne.pb(x);
		}
		else{
			cnt_zero++;
		}
	}
	ll po_len = po.size();
	ll ne_len = ne.size();

	

	k -= cnt_zero;
	

	// for(int i = 0; i < po_len; i++) {
	// 	cout << ne[i] << endl;
	// }
	


	if (k == po_len + ne_len){

		sort(ALL(po),greater<ll>());
		sort(ALL(ne));
		vector<ll> sum_po(po_len+1,1LL);
		vector<ll> sum_ne(ne_len+1,1LL);

		for(ll i = 0; i < po_len; i++) {
			sum_po[i+1] = sum_po[i] * po[i];
			sum_po[i+1] %= mod;
		}
		for(ll i = 0; i < ne_len; i++) {
			sum_ne[i+1] = sum_ne[i] * ne[i];
			sum_ne[i+1] %= mod;
			if(sum_ne[i+1] < 0LL){
				sum_ne[i+1] += mod;
			}
		}

		if (cnt_zero != 0LL){
			cout << 0 << endl;
		}
		else{
			if (po_len == 0){
				cout << sum_ne[ne_len] << endl;
			}
			else if (ne_len == 0){
				cout << sum_po[po_len] << endl;
			}
			else{
				cout << (sum_po[po_len] * sum_ne[ne_len]) % mod << endl;
			}
		}
		return 0;
	}
	
	else if (k % 2 == 1 && po_len == 0){
		ll res;
		sort(ALL(ne),greater<ll>());
		vector<ll> sum_ne(ne_len+1,1LL);
		for(ll i = 0; i < ne_len; i++) {
			sum_ne[i+1] = sum_ne[i] * ne[i];
			sum_ne[i+1] %= mod;
		// 	if(sum_ne[i+1] < 0LL){
		// 	sum_ne[i+1] += mod;
		// }
		}
		if (cnt_zero != 0){
			res = max(0LL,sum_ne[k]);
		}
		else{
			res = sum_ne[k];
		}
		if(res < 0LL){
			res += mod;
		}
		cout << res << endl;
		return 0;
	}
	else{
		sort(ALL(po),greater<ll>());
		sort(ALL(ne));
		ll ans = 1LL;
		ll id_p = 0;
		ll id_n = 0;
		ll element = 0;
		if (k % 2 == 1){
			ans *= po[0];
			id_p++;
			element++;
		}
		while(element < k){
			if (id_p + 1 *< po_len && id_n + 1 < ne_len){
				if (po[id_p] * po[id_p +1] <= ne[id_n] * ne[id_n+1]){
					ans *= ne[id_n] * ne[id_n + 1];
					id_n += 2;
					element+=2;
				}
				else{
					ans *= po[id_p] * po[id_p + 1];
					id_p += 2;
					element+= 2;
				}
			}
			else{
				if (id_n + 1 < ne_len){
					ans *= ne[id_n] * ne[id_n + 1];
					id_n += 2;
					element+=2;
				}
				else{
					ans *= po[id_p] * po[id_p + 1];
					id_p += 2;
					element+= 2;
				}
			}
			ans %= mod;
		}
		cout << ans << endl;
	}




	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:121:39: error: expected primary-expression before '<' token
  121 |                         if (id_p + 1 *< po_len && id_n + 1 < ne_len){
      |                                       ^
Language: C++

#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;
typedef pair<ll,ll> pll;
const int inf=0x3f3f3f3f;
const ll mod=1e9+7;
void A() {
    int n;
    cin>>n;
    int res=max(0,(n+999)/1000*1000-n);
    cout<<res<<endl;
}
void B() {
    int n;
    cin>>n;
    unordered_map<string,int>cnt;
    cnt["AC"]=0;
    cnt["WA"]=0;
    cnt["RE"]=0;
    cnt["TLE"]=0;
    for(int i=0;i<n;i++){
        string s;
        cin>>s;
        cnt[s]++;
    }
    cout<<"AC x "<<cnt["AC"]<<endl;
    cout<<"WA x "<<cnt["WA"]<<endl;
    cout<<"TLE x "<<cnt["TLE"]<<endl;
    cout<<"RE x "<<cnt["RE"]<<endl;
}
void C() {
    int h,w,k;
    cin>>h>>w>>k;
    vector<vector<char>> grid(h,vector<char>(w,'.'));
    int bl=0;
    for(int i=0;i<h;i++){
        for(int j=0;j<w;j++){
            cin>>grid[i][j];
            if(grid[i][j]=='#') bl++;
        }
    }
    int res=0;
    for(int i=0;i<(1<<h);i++){

        for(int j=0;j<(1<<w);j++){
            int cnt=bl;
            for(int x=0;x<h;x++){
                for(int y=0;y<w;y++){
                    if(grid[x][y]=='.')  continue;
                    if(i&(1<<x) || j&(1<<y)) cnt--;
                }
            }
            if(cnt==k) res++;
        }
    }
    cout<<res<<endl;
}

void D() {
    int n;
    cin>>n;
    vector<ll> a(n,0);
    for(int i=0;i<n;i++){
        cin>>a[i];
    }
    sort(a.begin(),a.end());
    reverse(a.begin(),a.end());
    ll res=0;
    int len=(n+1)/2; //使用a的前len个
    vector<ll> sum(len+1,0);
    for(int i=1;i<=len;i++){
        sum[i]=sum[i-1]+a[i-1];
    }
    res=sum[len]-a[len-1]+sum[len]-a[0];
    if(n%2==0) res+=a[len-1];
    cout<<res<<endl;
}
void E(){
    int n,k;
    cin>>n>>k;
    vector<ll> a(n,0);
    for(int i=0;i<n;i++) cin>>a[i];
    int res = 1;
    int l = 0,r = n - 1;
    ll sign = 1;
    if (k % 2)
    {
        res = a[r--];
        --k;
        if(res < 0) sign = -1;
    }
    while(k)
    {
        ll x = (ll)a[l] * a[l + 1], y = (ll)a[r - 1] * a[r];
        if(x * sign > y * sign)
        {
            res = x % mod * res % mod;
            l += 2;
        }
        else
        {
            res = y % mod * res % mod;
            r -= 2;
        }
        k -= 2;
    }
    cout<<(res + mod) % mod)<<endl;
}
void F()
{

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


Compiler output:
a.cc: In function 'void E()':
a.cc:109:28: error: expected ';' before ')' token
  109 |     cout<<(res + mod) % mod)<<endl;
      |                            ^
      |                            ;
Language: C++

#include<algorithm>
#include<bitset>
#include<cmath>
#include<complex>
#include<deque>
#include<functional>
#include<iomanip>
#include<iostream>
#include<map>
#include<numeric>
#include<queue>
#include<set>
#include<stack>
#include<string>
#include<unordered_map>
#include<unordered_set>
#include<utility>
#include<vector>

using namespace std;
typedef long long ll;

#define REP(i, n) for(ll i=0;i<(ll)(n);i++)
#define RREP(i, n) for(ll i=(ll)(n-1);i>=0;i--)
#define FOR(i, a, b) for(ll i=(ll)(a); i<=(ll)(b); i++)
#define RFOR(i, a, b) for(ll i=(ll)(a);i>=(ll)(b); i--)
#define ALL(x) (x).begin(),(x).end()
#define SIZE(x) ((ll)(x).size())
#define INF 1000000000000
#define MOD 1000000007
#define PB push_back
#define MP make_pair
#define F first
#define S second

signed main()
{
	int N, K;
	cin >> N >> K;
	int minnum=0;
	vector<ll> minA;
	int plnum=0;
	vector<ll> plA;
	REP(i, N){
		ll a;
		cin >> a;
		if(a<0){
			minnum++;
			minA.PB(a);
		}else if(a>0){
			plnum++;
			plA.PB(a);
		}
	}
	sort(ALL(minA));
	sort(ALL(plA), greater<ll>());
	ll ans = 1;
	if((plnum+minnum<K) or (plnum==0 and K%2==1 and N>minnum)){
		cout << 0 << endl;
		return 0;
	}
	if(plnum==0 and K%2==1){
		for(int i=0; i<K; i++){
			ans = (ans*(minA[minA.size()-1-i])+MOD)%MOD;
		}
		cout << ans << endl;
		return 0;
	}
	if(plnum==0 and K%2 == 0){
		for(int i=0; i<K; i++){
			ans = (ans * minA[i] + MOD) % MOD;
		}
		cout << ans << endl;
		return 0;
	}
	if(minnum==0){
		for(int i=0; i<K; i++){
			ans = (ans * plA[i]) % MOD;
		}
		cout << ans << endl;
		return 0;
	}
	int mind=0;
	int pind=0;
	int now=0;
	REP(i, K){
		if(pind<plnum and plA[pind]>=-minA[mind]){
			pind++;
			now=1;
		}else{
			mind++;
			now=-1;
		}
	}
	if(mid %2 == 1){
		if(mind == minnum or now == -1){
			mind--;
			pind++;
		}else if(pind == plnum or now == 1){
			mind++;
			pind--;
		}
	}
	REP(i, mind){
		ans = (ans*((minA[i]+MOD)%MOD))%MOD;
	}
	REP(i, pind){
		ans = (ans*plA[i])%MOD;
	}
	cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:95:12: error: 'mid' was not declared in this scope; did you mean 'mind'?
   95 |         if(mid %2 == 1){
      |            ^~~
      |            mind
Language: C++

// #include <bits/stdc++.h>
#include <algorithm>
#include <cmath>
#include <deque>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <unordered_map>
#include <unordered_set>
#include <utility>
#include <vector>

using namespace std;
typedef long long ll;

#define all(x) begin(x), end(x)
#define rep(i,n) for(int i=0; i<n; i++)

ll MOD = 1e9 + 7;

ll modinv(ll a, ll p) {
    ll b = p;
    ll x = 1, y = 0;

    while (b) {
        a = a%b;
        x -= (a/b) * y;
        swap(a, b);
        swap(x, y);
    }

    x %= p;
    if (x < 0) x += p;
    return x;
}


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

    vector<ll> pl, mi;
    int temp;
    rep(i, n) {
        cin >> temp;
        if (temp>=0) pl.push_back(temp);
        else mi.push_back(-1*temp);
    }

    sort(all(pl));
    sort(all(mi));

    reverse(all(pl));
    reverse(all(mi));

    ll ans = 1;
    int itr_pl = 0;
    int itr_mi = 0;

    if (pl.size()==0) {
        if (k%2) reverse(all(mi))
        rep(i, k) ans = (ans*mi[i]) % MOD;
        if (k%2) ans = MOD - ans;
        cout << ans << endl;
        return 0;
    }

    while (k > itr_pl+itr_mi) {
        if (pl[itr_pl] == 0) {
            if (k-itr_pl > itr_mi) {
                cout << 0 << endl;
                return 0;
            }
            if (itr_pl!=0 && (k-(itr_pl+itr_mi))%2) {
                itr_pl--;
                ans = ans * modinv(pl[itr_pl], MOD);
                ans %= MOD;
            }
            for (; k > itr_pl+itr_mi; itr_mi++) ans = (ans*mi[itr_mi]) % MOD;
            break;
        }
        if (itr_mi+1<mi.size() && itr_pl+1<pl.size() && k-(itr_pl+itr_mi)>1 && (pl[itr_pl]+pl[itr_pl+1] < mi[itr_mi]+mi[itr_mi+1])) {
            ans = ans * ((mi[itr_mi]*mi[itr_mi+1]) % MOD);
            ans %= MOD;
            itr_mi += 2;
        } else {
            ans = (ans * pl[itr_pl]) % MOD;
            itr_pl++;
        }
    }

    // if (ans<0) ans += MOD;
    cout << ans << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:66:34: error: expected ';' before 'for'
   66 |         if (k%2) reverse(all(mi))
      |                                  ^
      |                                  ;
a.cc:67:13: error: 'i' was not declared in this scope; did you mean 'mi'?
   67 |         rep(i, k) ans = (ans*mi[i]) % MOD;
      |             ^
a.cc:22:31: note: in definition of macro 'rep'
   22 | #define rep(i,n) for(int i=0; i<n; i++)
      |                               ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
long MOD=1e9+7,n,k,ans=1,l,r,flg=1,a[1<<18],x,y;
int main(){
  cin>>n>>k;
  r=n-1;
  for(int i=0;i<n;i++)cin>>a[i];
  sort(a,a+n);
  if(k%2)ans=a[r],r--,k--,flg=(ans<0?-1:1);
  while(k){
    x=a[l]*a[l+1],y=a[r]*a[r-1];
    if(x*flg>y*flg)ans*=x%MOD,ans%=MOD,l+=2;
    else ans*=y%MOD,ans%=MOD,r-=2;
    k-=2;
  }
  cout<<(ans%MOD+MOD)%MOD)<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:26: error: expected ';' before ')' token
   16 |   cout<<(ans%MOD+MOD)%MOD)<<endl;
      |                          ^
      |                          ;
Language: C++

#include<algorithm>
#include<bitset>
#include<cmath>
#include<complex>
#include<deque>
#include<functional>
#include<iomanip>
#include<iostream>
#include<map>
#include<numeric>
#include<queue>
#include<set>
#include<stack>
#include<string>
#include<unordered_map>
#include<unordered_set>
#include<utility>
#include<vector>

using namespace std;
typedef long long ll;

#define REP(i, n) for(ll i=0;i<(ll)(n);i++)
#define RREP(i, n) for(ll i=(ll)(n-1);i>=0;i--)
#define FOR(i, a, b) for(ll i=(ll)(a); i<=(ll)(b); i++)
#define RFOR(i, a, b) for(ll i=(ll)(a);i>=(ll)(b); i--)
#define ALL(x) (x).begin(),(x).end()
#define SIZE(x) ((ll)(x).size())
#define INF 1000000000000
#define MOD 1000000007
#define PB push_back
#define MP make_pair
#define F first
#define S second

signed main()
{
	int N, K;
	cin >> N >> K;
	int minnum=0;
	vector<ll> minA;
	int plnum=0;
	vector<ll> plA;
	REP(i, N){
		ll a;
		cin >> a;
		if(a<0){
			minnum++;
			minA.PB(a);
		}else if(a>0){
			plnum++;
			plA.PB(a);
		}
	}
	sort(ALL(minA));
	sort(ALL(plA), greater<ll>());
	ll ans = 1;
	if((plnum+minnum<K) or (plnum==0 and K%2==1 and N>minnum)){
		cout << 0 << endl;
		return 0;
	}
	if(plnum==0 and K%2==1){
		for(int i=0; i<K; i++){
			ans = (ans*(minA[minA.size()-1-i])+MOD)%MOD;
		}
		cout << ans << endl;
		return 0;
	}
	if(plnum==0 and K%2 == 0){
		for(int i=0; i<K; i++){
			ans = (ans * minA[i] + MOD) % MOD;
		}
		cout << ans << endl;
		return 0;
	}
	if(minnum==0){
		for(int i=0; i<K; i++){
			ans = (ans * plA[i]) % MOD;
		}
		cout << ans << endl;
		return 0;
	}
	int mind=0;
	int pind=0;
	int now=0;
	REP(i, K){
		if(plA[pind]>=-minA[mind]){
			pind++;
			now=1;
		}else{
			mind++;
			now=-1;
		}
	}
	if(mind %2 == 0){
		REP(i, mind){
			ans = (ans*((minA[i]+MOD)%MOD))%MOD;
		}
		REP(i, pind){
			ans = (ans*plA[i])%MOD;
		}
	}else{
		if(now == 1){
			REP(i, mind){
				ans = (ans*((minA[i]+MOD)%MOD))%MOD;
			}
			REP(i, pind-1){
				ans = (ans*plA[i])%MOD;
			}
		}else{
			REP(i, mind-1){
				ans = (ans*((minA[i]+MOD)%MOD))%MOD;
			}
			REP(i, pind){
				ans = (ans*plA[i])%MOD;
			}
		}
		while(true){
			if(pind<plA.size() and plA[pind]>=-minA[mind]){
				if(now == -1){
					ans = (ans*plA[pind])%MOD;
					break;
				}
				pind++;
			}else if(mind<mlA.size()){
				if(now == 1){
					ans = (ans*((minA[mind]+MOD)%MOD))%MOD;
					break;
				}
				mind++;
			}
		}
	}
	cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:125:39: error: 'mlA' was not declared in this scope; did you mean 'plA'?
  125 |                         }else if(mind<mlA.size()){
      |                                       ^~~
      |                                       plA
Language: C++

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp> 
#include <ext/pb_ds/tree_policy.hpp> 
using namespace std;
using namespace __gnu_pbds;   
#define ordered_set tree<ll, null_type,less<ll>, rb_tree_tag,tree_order_statistics_node_update> 
#define ll long long int
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pll pair<ll,ll>
#define all(x) x.begin(),x.end()
#define sz(x) (ll)x.size() 

ll up[200005],un[200005];
int main()
{
    ios_base::sync_with_stdio(false);
	ll n,i,j,k,x,y,t,m,tot=0;

	cin >> n >> k;
	vector<ll>neg,pos,zer,fin,lneg;
	for(i=0;i<n;i++)
	{
		cin >> x;
		if(x>0)
			pos.pb(x);
		if(x<0)
			neg.pb(x);
		if(x==0)
			zer.pb(x);
	}
	ll MD=1e9+7;
	sort(all(pos)),sort(all(neg));
	reverse(all(pos));

	i=0,j=0;
	while(i<sz(pos)-1 && j<sz(neg)-1 && tot<=k-2)
	{
		if(pos[i]*pos[i+1]>neg[j]*neg[j+1])
			up[i]=1,up[i+1]=1,i+=2,tot+=2;
		else
			un[j]=1,un[j+1]=1,j+=2,tot+=2;
	}
	while( i<sz(pos)-1 && tot<=k-2)
		up[i]=1,up[i+1]=1,i+=2,tot+=2;
	while( j<sz(neg)-1 && tot<=k-2)
		un[j]=1,un[j+1]=1,j+=2,tot+=2;

	if(tot<k)
	{
		if(i<sz(pos))
			up[i++]=1,tot++;
	}

	if(tot<k)
	{
		if(sz(zer))
		{
			cout<<0<<endl;
			return 0;
		}
		else
		{
			ll x=1;
			for(j=sz(neg)-1;j>=0;j--)
			{
				if(k==0)
					break;
				neg[j]=((neg[j]%MD)+MD)%MD
				x=(x*neg[j])%MD%MD;
				k--;
			}
			cout<<x<<endl;
			return 0;
		}
	}

	x=1;
	for(j=sz(neg)-1;j>=0;j--)
	{
		if(!un[j])continue;
		neg[j]=((neg[j]%MD)+MD)%MD
		x=(x*neg[j])%MD%MD;
	}
	for(j=sz(pos)-1;j>=0;j--)
	{
		if(!up[j])continue;
		x=(x*pos[j])%MD;
	}
	cout<<x<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:71:59: error: expected ';' before 'x'
   71 |                                 neg[j]=((neg[j]%MD)+MD)%MD
      |                                                           ^
      |                                                           ;
   72 |                                 x=(x*neg[j])%MD%MD;
      |                                 ~                          
a.cc:84:43: error: expected ';' before 'x'
   84 |                 neg[j]=((neg[j]%MD)+MD)%MD
      |                                           ^
      |                                           ;
   85 |                 x=(x*neg[j])%MD%MD;
      |                 ~
Language: C++

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

const int mod = 1e9 + 7;

int main() {
	int n, k;
	cin >> n >> k;
	vector<int> a(n);
	long long res = 1;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
		res = (res*a[i]) % mod;
	}
	if (k == n) {
		cout << (res + mod) % mod << endl;
		return 0;
	}
	sort(a.begin(), a.end());
	if (a[n-1] == 0 && k%2) {
		cout << 0 << endl;
		continue;
	}
	res = 1;
	if (a[n-1] < 0) {
		if (k % 2) {
			for (int i = n-1; i >= n-k; i--) {
				res = (res*a[i]) % mod;
			}
		} else {
			for (int i = 0; i < k; i++) {
				res = (res*a[i]) % mod;
			}
		}
	} else {
		int i = 0, j = n-1;
		int minus = 0, t = k;
		while (t > 0) {
			if (abs(a[i]) > abs(a[j])) {
				if (a[i] < 0) minus++;
				i++;
			} else {
				if (a[j] < 0) minus++;
				j--;
			}
			t--;
		}
		if (minus % 2) {
			if (j == n-1) {
				// no positive
				for (int l = 0; l < i-1; l++) {
					res = (res*a[l]) % mod;
				}
				res = (res*a[j]) % mod;
			} else {
				if (abs(1LL*a[i]*a[i-1]) > abs(1LL*a[j]*a[j+1])) {
					i++; j++;
				} else {
					i--; j--;
				}
				for (int l = 0; l < i; l++) {
					res = (res*a[l]) % mod;
				}
				for (int l = n-1; l > j; l--) {
					res = (res*a[l]) % mod;
				}
			}
		} else {
			for (int l = 0; l < i; l++) {
				res = (res*a[l]) % mod;
			}
			for (int l = n-1; l > j; l--) {
				res = (res*a[l]) % mod;
			}
		}
	}
	cout << (res+mod)%mod << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:17: error: continue statement not within a loop
   22 |                 continue;
      |                 ^~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int maxn=2e5+13;
int a[maxn];
int b[maxn];
const int mod=1e9+7;
int c[maxn];
bool cmp(int x,int y)
{
	return abs(c[x])>abs(c[y]);
}
int main()
{
	int n,k,t,flag=0;
	int cnt1=0,cnt2=0;
	scanf("%d%d",&n,&k);
	ll ans=1ll;
	for(int i=1;i<=n;i++)
	{
		scanf("%d",&c[i]);
		if(c[i]>0) a[++cnt1]=c[i];
		else if(c[i]<0) b[++cnt2]=-c[i];
		else flag=1;
	 } 
	sort(a+1,a+cnt1+1);
	sort(b+1,b+cnt2+1);
	int check=1; 
	if(k%2==1&&cnt1==0) check=0;
	if(cnt2%2==1&&k==n)
	{
		check=0;
	}
	if(check)
	{
		int now2=cnt2;
		int now1=cnt1;
		int now=0;
		while(now!=k) 
		{
		if(k-now==1)
		{
			int r=max(a[now1],b[now2]);
			ans=(ans*r*1ll)%mod
			break;
		}
		if(now2>=2&&1ll*b[now2]*b[now2-1]>1ll*a[now1]*a[now1-1])
		{
				ans=((ans*1ll*b[now2])%mod)*b[now2-1]%mod;
				now2-=2;
		}
		else if(now1>=2&&1ll*b[now2]*b[now2-1]<=1ll*a[now1]*a[now1-1]) ans=((ans*1ll*a[now1])%mod)*a[now1-1]%mod,now1-=2;
		now+=2;}
		
	}
	else
	{
		if(flag)
		{
			return printf("0"),0;
		 } 
		sort(c+1,c+1+n,cmp);
		for(int i=1;i<=k;i++)
		{
			ans*=1ll*c[i];
			while(ans<0) ans+=mod;
		}	
	}
	printf("%lld",ans);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:44: error: expected ';' before 'break'
   44 |                         ans=(ans*r*1ll)%mod
      |                                            ^
      |                                            ;
   45 |                         break;
      |                         ~~~~~
Language: C++

def maxProductSubarrayOfSizeK(A, n, k): 

	A.sort() 

	product = 1

	if (A[n - 1] == 0 and (k & 1)): 
		return 0

	if (A[n - 1] < 0 and (k & 1)): 
	    A.reverse()
	    for i in range(k):
	        product *= A[i]
	    return product

	i = 0

	j = n - 1

	if (k & 1): 
		product *= A[j] 
		j-= 1
		k-=1

	k >>= 1

	for itr in range( k) : 

		left_product = A[i] * A[i + 1] 

		right_product = A[j] * A[j - 1] 

		if (left_product > right_product) : 
			product *= left_product 
			i += 2
		
		else : 
			product *= right_product 
			j -= 2

	return product 

n, k = map(int, input().split(' '))
numbers = [int(x) for x in input().split(' ')]
MOD = 1000000007
ans = maxProductSubarrayOfSizeK(numbers, n, k)
#print(ans)
print((ans + MOD)%MOD)

Compiler output:
a.cc:47:2: error: invalid preprocessing directive #print
   47 | #print(ans)
      |  ^~~~~
a.cc:1:1: error: 'def' does not name a type
    1 | def maxProductSubarrayOfSizeK(A, n, k):
      | ^~~
Language: C

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

static void arr_sort(int *a, int i)
{
  int tmp;
  int k;
  
  k = i;
  while (k > 0)
  {
    if (abs(a[k]) > abs(a[k - 1]))
    {
      tmp = a[k];
      a[k] = a[k - 1];
      a[k - 1] = tmp;
    }
    k--;
  }
}

static long find_max(a, k, n)
{
  int i;
  int flag;
  int ind;
  long times;
  
  i = 0;
  flag = 0;
  ind = -1;
  times = 1;
  while (i < k)
  {
    if (a[i] < 0)
    {
      flag++;
      ind = i;
    }
    times *= a[i++];
  }
  if (flag % 2 != 0)
  {
    times /= a[ind];
    while (i < n)
    {
      if (a[i] > 0)
      {
        times *= a[i];
        break;
      }
      i++;
    }
  }
  return (times);
}

int main(void)
{
  int n;
  int k;
  int i;
  int *a;
  long times;
  long res;
  
  if (!(scanf("%d %d", &n, &k)))
    return (0);
  a = (int *)malloc(n * sizeof(int));
  i = 0;
  while (i < n)
  {
    if (!(scanf("%d", &a[i])))
        return (0);
    arr_sort(a, i++);
  };
  times = find_max(a, k, n);
  free(a);
  printf("%ld", times % (1000000000 + 7));
  return (0);
}


Compiler output:
main.c: In function 'find_max':
main.c:23:13: error: type of 'a' defaults to 'int' [-Wimplicit-int]
   23 | static long find_max(a, k, n)
      |             ^~~~~~~~
main.c:23:13: error: type of 'k' defaults to 'int' [-Wimplicit-int]
main.c:23:13: error: type of 'n' defaults to 'int' [-Wimplicit-int]
main.c:36:10: error: subscripted value is neither array nor pointer nor vector
   36 |     if (a[i] < 0)
      |          ^
main.c:41:15: error: subscripted value is neither array nor pointer nor vector
   41 |     times *= a[i++];
      |               ^
main.c:45:15: error: subscripted value is neither array nor pointer nor vector
   45 |     times /= a[ind];
      |               ^
main.c:48:12: error: subscripted value is neither array nor pointer nor vector
   48 |       if (a[i] > 0)
      |            ^
main.c:50:19: error: subscripted value is neither array nor pointer nor vector
   50 |         times *= a[i];
      |                   ^
Language: C++

#include <bits/stdc++.h>
    #define mod 1000000007
    #define ll long long int
    using namespace std;
    ll maxProductSubarrayOfSizeK(ll A[], ll n, ll k) 
    { 
        sort(A, A + n); 
        ll product = 1; 
        if (A[n - 1] == 0 && (k & 1)) 
            return 0; 
      
        if (A[n - 1] <= 0 && (k & 1)) { 
            for (ll i = n - 1; i >= n - k; i--) {
                product =((product%mod)*(A[i]%mod))%mod; 
                if(product<0){
                   product=mod+product;
            }

            }
        }
            return product%mod; 
        } 
      
       
        ll i = 0; 
        ll j = n - 1; 
        if (k & 1) { 
            product =((product%mod)*(A[j]%mod)); 
            if(product<0){
                   product=mod+product;
            }
            j--; 
            k--; 
        } 
        k >>= 1; 
        for (ll itr = 0; itr < k; itr++) { 
            ll left_product = ((A[i]) * (A[i + 1]))%mod; 
            ll right_product = ((A[j])*(A[j - 1]))%mod; 
            if (left_product > right_product) { 
                product = ((product%mod)*(left_product%mod))%mod; 
                if(product<0){
                   product=mod+product;
            }
                i += 2; 
            } 
            else { 
                product =((product%mod)*(right_product%mod))%mod; 
                if(product<0){
                   product=mod+product;
            }
                j -= 2; 
            } 
        } 
      
        // Finally return product 
                    if(product<0)product=mod+product;

        return (product%mod); 
    } 
    int main() {
        ll t=1;
        //cin>>t;
        while(t--){
            ll n,k;
            cin>>n>>k;
            ll arr[n];
            ll i;
            for(i=0;i<n;i++){
                cin>>arr[i];
            }
            ll z=maxProductSubarrayOfSizeK(arr,n,k);
            cout<<z<<endl;
        }
    }

Compiler output:
a.cc:26:16: error: 'n' was not declared in this scope; did you mean 'yn'?
   26 |         ll j = n - 1;
      |                ^
      |                yn
a.cc:27:9: error: expected unqualified-id before 'if'
   27 |         if (k & 1) {
      |         ^~
a.cc:35:9: error: 'k' does not name a type
   35 |         k >>= 1;
      |         ^
a.cc:36:9: error: expected unqualified-id before 'for'
   36 |         for (ll itr = 0; itr < k; itr++) {
      |         ^~~
a.cc:36:26: error: 'itr' does not name a type
   36 |         for (ll itr = 0; itr < k; itr++) {
      |                          ^~~
a.cc:36:35: error: 'itr' does not name a type
   36 |         for (ll itr = 0; itr < k; itr++) {
      |                                   ^~~
a.cc:56:21: error: expected unqualified-id before 'if'
   56 |                     if(product<0)product=mod+product;
      |                     ^~
a.cc:58:9: error: expected unqualified-id before 'return'
   58 |         return (product%mod);
      |         ^~~~~~
a.cc:59:5: error: expected declaration before '}' token
   59 |     }
      |     ^
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define PI 3.14159265359
using namespace std;
using ll = long long;
using P = pair<int, int>;

const int mod = 1000000007;
struct mint {
  ll x;
  mint(ll x=0):x(x%mod){}
  mint operator-() const { return mint(-x);}
  mint& operator+=(const mint a) {
    if ((x += a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator-=(const mint a) {
    if ((x += mod-a.x) >= mod) x -= mod;
    return *this;
  }
  mint& operator*=(const mint a) {
    (x *= a.x) %= mod;
    return *this;
  }
  mint operator+(const mint a) const {
    mint res(*this);
    return res+=a;
  }
  mint operator-(const mint a) const {
    mint res(*this);
    return res-=a;
  }
  mint operator*(const mint a) const {
    mint res(*this);
    return res*=a;
  }
  mint pow(ll t) const {
    if (!t) return 1;
    mint a = pow(t>>1);
    a *= a;
    if (t&1) a *= *this;
    return a;
  }
  
  mint inv() const {
    return pow(mod-2);
  }
  mint& operator/=(const mint a) {
    return (*this) *= a.inv();
  }
  mint operator/(const mint a) const {
    mint res(*this);
    return res/=a;
  }
};

ll abs(ll a) {
  return (a < 0) ? -a : a;
}

bool comp(int a, int b) {
  return abs(a) > abs(b);
}

int main() {
  int n, k;
  cin >> n >> k;
  vector<int> a(n);
  int mall = 0;
  rep(i, n) { cin >> a[i]; if (a[i] < 0) mall++; }

  mint ans = 1;
  if (mall == n && k % 2 == 1) {
    sort(a.begin(), a.end());
    reverse(a.begin(), a.end());
    rep(i, k) ans *= (a[i] + 1000000007);
    cout << ans.x << endl;
    return 0;
  }

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

  int m = 0;
  rep(i, k) {
    ans *= (a[i] + 1000000007);
    if (a[i] < 0) m++;
  }

  bool flug = true;
  for (int i = k; i < n; i++) {
    if (a[i] > 0) flug = false;
  }

  if (m % 2 == 0 || n == k || ans.x == 0 || (m % 2 == 0 && flug)){
    cout << ans.x << endl;
  } else {
    ll pmin = 0, mmax = 0, mmin = 0, pmax = 0;
    for (int i = k - 1; i >= 0; i--) {
      if (a[i] > 0 && pmin == 0) {
        pmin = a[i];
      }
      if (a[i] < 0 && mmin == 0) {
        mmin = a[i];
      }
    }
    for (int i = k; i < n; i++) {
      if (a[i] < 0 && mmax == 0) {
        mmax = a[i];
      }
      if (a[i] > 0 && pmax == 0) {
        pmax = a[i];
      }
    }
    ll mm = mmax * mmin, pp = pmax * pmin;
    if (mm > pp) {
      ans = ans.x / pmin * mmax;
    } else {
      ans = ans.x / mmin * pmax;
    }
    cout << ans.x << endl;
  }

  return 0;
}
/*
*/


Compiler output:
a.cc:58:12: error: 'll abs(ll)' conflicts with a previous declaration
   58 | ll abs(ll a) {
      |            ^
In file included from /usr/include/c++/14/cstdlib:81,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:42,
                 from a.cc:1:
/usr/include/c++/14/bits/std_abs.h:61:3: note: previous declaration 'long long int std::abs(long long int)'
   61 |   abs(long long __x) { return __builtin_llabs (__x); }
      |   ^~~
Language: C++

#include <bits/stdc++.h> 
using namespace std; 
typedef long long ll;
ll mod = 1e9+7;

int main() { 
  
	ll n,k;
	cin>>n>>k;
	ll a[n],b[n];
	memset(b,0,sizeof(b));
	vector<ll> pos,neg;
	//ll zero = 0;
	for(int i=0; i<n; i++) {
		cin>>a[i];
		if(a[i]!=0) b[i] = abs(a[i]);
		if(a[i]>0) pos.push_back(a[i]);
		else if(a[i]<0) neg.push_back(a[i]);
		else zero++;
			
	} 
	sort(b,b+n);
	sort(pos.begin(),pos.end());
	sort(neg.begin(),neg.end());
	if(n-zero<k) cout<<0;
	else {
		ll ans = 1;
		/*if(pos.size()<=k) {
			for(auto it = pos.end()-1; it>=pos.begin(); it--) {
				ans = (ans*(*it))%mod;
			}
		}
		else {
			if((k-pos.size())%2==0) {
				for(auto it = pos.end()-1; it>=pos.begin(); it--) {
				ans = (ans*(*it))%mod;
				}
				ll ct = k-pos.size();
				for(auto it = neg.begin(); it!=neg.end(); it++) {
					ans = (ans*abs((*it)))%mod;
					ct--;
					if(ct==0) break;
				}		
			}
		}
		else if((k-pos.size())%2!=0) {

		}*/
		//ll fff = 0;
		ll f = k;
		//if(neg.size()%2!=0) fff = neg.size()-1; 
		//if(pos.size()+fff>=k) {
		for(int i = n-1; i>=0; i--) {
			ans = (ans*b[i])%mod;
			k--;
			if(k==0) break;
		}
		if(n==k) {
			ans = mod - ans;
		}
		else if(pos.size()==0) {
			ans = 1;
			for(int i = 0; i<n; i++) {
			if (b[i]!=0) {
				ans = (ans*b[i])%mod;
				f--;
			}
			if(f==0) break;

		}	
		ans = mod - ans;
					}
		//}
		//else {

		//}
		cout<<ans;
	}

	//cout<<-6%1000000007;
	return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:19:22: error: 'zero' was not declared in this scope; did you mean 'bzero'?
   19 |                 else zero++;
      |                      ^~~~
      |                      bzero
a.cc:25:14: error: 'zero' was not declared in this scope; did you mean 'bzero'?
   25 |         if(n-zero<k) cout<<0;
      |              ^~~~
      |              bzero