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

#include<bits/stdc++.h>
#include<cstdlib>
using namespace std;
int gcd(int a,int b){
  if(a==0){
    return b;
  }
  if(b==0){
    return a;
  }
  else if(a%b==0){
    return b;
  }
else{
  return gcd(b,a%b);
}
}
  int main(){
    int n;
    cin>>n;
    int a[n];
    int(int i=0;i<n;i++){
      cin>>a[i];
    }
    int r[n+1],l[n+1];
    r[0]=0;
    l[n+1]=0;
    for(int i=0;i<n;i++){
      r[i+1]=gcd(r[i],a[i]);
    }
    for(int i=n;i>=0;i--){
      l[i]=gcd(l[i+1],a[i]);
    }
    int ans=0;
    for(int i=1;i<n+1;i++){
      ans=max(ans,gcd(l[i],r[i]));
    }
    cout<<ans;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:22:5: error: expected primary-expression before 'int'
   22 |     int(int i=0;i<n;i++){
      |     ^~~
a.cc:22:17: error: 'i' was not declared in this scope
   22 |     int(int i=0;i<n;i++){
      |                 ^
Language: C++

#include<bits/stdc++.h>
#include<cstdlib>
using namespace std;
int gcd(int a,int b){
  if(a==0){
    return b;
  }
  if(b==0){
    return a;
  }
  else if(a%b==0){
    return b;
  }
else{
  return gcd(b,a%b);
}
}
  int main(){
    int n;
    cin>>n;
    int a[n];
    int(i=0;i<n;i++){
      cin>>a[i];
    }
    int r[n+1],l[n+1];
    r[0]=0;
    l[n+1]=0;
    for(int i=0;i<n;i++){
      r[i+1]=gcd(r[i],a[i]);
    }
    for(int i=n;i>=0;i--){
      l[i]=gcd(l[i+1],a[i]);
    }
    int ans=0;
    for(int i=1;i<n+1;i++){
      ans=max(ans,gcd(l[i],r[i]));
    }
    cout<<ans;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:22:9: error: 'i' was not declared in this scope
   22 |     int(i=0;i<n;i++){
      |         ^
Language: C++

#include<iostream>

#include<vector>


using namespace std;

int GCD(int a, int b){
  return b != 0? GCD(b,a%b) : a;
}


int main(void){
  int N;

  cin >> N;
  vector<int> a(N);
  vector<int> left(N+1,0),right(N+1,0); //配列の中を全部ゼロにできる

  //入力
  for(int i = 0; i < N; i++)cin >> a[i];
  //左
 for(int i = 0; i < N; i++)left[i+1]=GCD(left[i],a[i]);
//   //右
 for(int i = N - 1; i >= 0; i--)right[i] = GCD(right[i + 1],a[i]);
//   //合体
vector<int> M(N);
for(int i =0; i < N; i++)M[i] = GCD(left[i],right[i+1]);
int max =*max_element(M.begin(),M.end());
cout << max << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:29:11: error: 'max_element' was not declared in this scope
   29 | int max =*max_element(M.begin(),M.end());
      |           ^~~~~~~~~~~
Language: C++

#include<iostream>
#include<vector>


using namespace std;

int GCD(int a, int b){
  return b != 0? GCD(b,a%b) : a;
}



int main(void){
  int N;

  cin >> N;
  vector<int> a(N);
  vector<int> left(N+1,0),right(N+1,0); //配列の中を全部ゼロにできる

  //入力
  for(int i = 0; i < N; i++)cin >> a[i];
  //左
 for(int i = 0; i < N; i++)left[i+1]=GCD(left[i],a[i]);
//   //右
 for(int i = N - 1; i >= 0; i--)right[i -1] = GCD(right[i],a[i]);
//   //合体
vector<int> M(N);
for(int i =0; i < N; i++)M[i] = GCD(left[i],right[i]);
int max =*max_element(M.begin(),M.end());
cout << max << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:29:11: error: 'max_element' was not declared in this scope
   29 | int max =*max_element(M.begin(),M.end());
      |           ^~~~~~~~~~~
Language: C++

#include <iostream>
using namespace std;

int main(){
    int　a[100000],n,i,t,max = 0,ans=0;
    int count = 0;
    cin >> n;
    for (i = 0 ; i< n;i++){
        cin >> a[i];
        if(max < a[i]){
            max = a[i];
        }
    }

    for (t = 2 ; t <= max ;t++){
        
        for(i = 0 ; i < n;i++){
            if(a[i]%t != 0){
                count++;
            }

            if(count == 2){
                break;
            }
            ans = t;
        }
        count =0;
    }

    cout<<t<<endl;
}

Compiler output:
a.cc:5:5: error: extended character 　 is not valid in an identifier
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |     ^
a.cc: In function 'int main()':
a.cc:5:5: error: 'int\U00003000a' was not declared in this scope
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |     ^~~~~~
a.cc:5:20: error: 'n' was not declared in this scope
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |                    ^
a.cc:5:22: error: 'i' was not declared in this scope
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |                      ^
a.cc:5:24: error: 't' was not declared in this scope; did you mean 'tm'?
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |                        ^
      |                        tm
a.cc:5:32: error: overloaded function with no contextual type information
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |                                ^
a.cc:5:34: error: 'ans' was not declared in this scope; did you mean 'abs'?
    5 |     int　a[100000],n,i,t,max = 0,ans=0;
      |                                  ^~~
      |                                  abs
a.cc:9:16: error: 'a' was not declared in this scope
    9 |         cin >> a[i];
      |                ^
a.cc:10:12: error: parse error in template argument list
   10 |         if(max < a[i]){
      |            ^~~~~~~~~~
a.cc:10:22: error: cannot resolve overloaded function 'max' based on conversion to type 'bool'
   10 |         if(max < a[i]){
      |                      ^
a.cc:18:16: error: 'a' was not declared in this scope
   18 |             if(a[i]%t != 0){
      |                ^
Language: C++

#include <iostream>
using namespace std;

int main(){
    long long int　a[100000],n,i,t,max = 0,ans=0;
    int count = 0;
    cin >> n;
    for (i = 0 ; i< n;i++){
        cin >> a[i];
        if(max < a[i]){
            max = a[i];
        }
    }

    for (t = 2 ; t <= max ;t++){
        
        for(i = 0 ; i < n;i++){
            if(a[i]%t != 0){
                count++;
            }

            if(count == 2){
                break;
            }
            ans = t;
        }
        count =0;
    }

    cout<<t<<endl;
}

Compiler output:
a.cc:5:15: error: extended character 　 is not valid in an identifier
    5 |     long long int　a[100000],n,i,t,max = 0,ans=0;
      |               ^
a.cc: In function 'int main()':
a.cc:9:16: error: 'a' was not declared in this scope
    9 |         cin >> a[i];
      |                ^
a.cc:18:16: error: 'a' was not declared in this scope
   18 |             if(a[i]%t != 0){
      |                ^
Language: C++

#include <iosteram>
using namespace std;

int main(){
    long long int　a[100000],n,i,t,max = 0,ans=0;
    int count = 0;
    cin >> n;
    for (i = 0 ; i< n;i++){
        cin >> a[i];
        if(max < a[i]){
            max = a[i];
        }
    }

    for (t = 2 ; t <= max ;t++){
        
        for(i = 0 ; i < n;i++){
            if(a[i]%t != 0){
                count++;
            }

            if(count == 2){
                break;
            }
            ans = t;
        }
        count =0;
    }

    cout<<t<<endl;
}

Compiler output:
a.cc:1:10: fatal error: iosteram: No such file or directory
    1 | #include <iosteram>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

#include "../library/lib.hpp"
#include <iostream>
using namespace std;

int gcd(int a, int b){
	int mn = min(a,b);
	int mx = max(a,b);
	a = mn;
	b = mx;
	if (a == 0)
		return b;
	return gcd(b%a, a);
}

class CGCDOnBlackboard {
public:
	void solve(std::istream& in, std::ostream& out) {
		int n;
		in >> n;
		int x;
		vector<int> a, l, r;
		REP(i,n)
			in >> x, a.pb(x);
		l.assign(n+1, 0);
		r.assign(n+1, 0);
		l[0] = a[0];
		r[n-1] = a[n-1];
		for(int i = 1; i < a.size(); i++){
			int aux = l[i-1];
			l[i] = gcd(a[i], aux);
		}

		for(int i = n-2; i >= 0; i--){
			r[i] = gcd(a[i], r[i+1]);
		}

		int ans = max(l[n-2], r[1]);
		for(int i = 1; i < n; i++){
			ans = max(ans, gcd(l[i-1], r[i+1]));
		}
		out << ans;
	}
};

Compiler output:
a.cc:1:10: fatal error: ../library/lib.hpp: No such file or directory
    1 | #include "../library/lib.hpp"
      |          ^~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

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

using namespace std;

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  for(int i=0; i<n; i++){
    cin >> a[i];
  }
  vector<int> l_gcd(n);
  vector<int> r_gcd(n);
  l_gcd[0] = a[0];
  r_gcd[n-1] = a[n-1];
  for(int i=1; i<n-1; i++){
    l_gcd[i] = __gcd(l_gcd[i-1],a[i]);
    r_gcd[n-1-i] = __gcd(r_gcd[n-i],a[n-1-i])
  }

  int max = r_gcd[1];
  for(int i=1; i<n-1; i++){
    int temp = __gcd(l_gcd[i-1],r_gcd[i+1]);
    if(temp > max){
      max = temp;
    }
  }
  if(l_gcd[n-2] > max){
    max = l_gcd[n-2];
  }
  cout << max << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:46: error: expected ';' before '}' token
   21 |     r_gcd[n-1-i] = __gcd(r_gcd[n-i],a[n-1-i])
      |                                              ^
      |                                              ;
   22 |   }
      |   ~
Language: C++

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

int euclidean_gcd(int a, int b) {
	while(a > 0 && b > 0) {
		if(a > b) a -= b;
		else b -= a;
	}
	int ret = (a == 0 ? b : a);
	return ret;
}

int main(void) {
	// input
	int n;
	std::cin >> n;
	std::vector<int> a(n);
	for(int i = 0; i < n; ++i) {
		std::cin >> a[i];
	}
	
	// erase and calc
	std::vector<int> l(n + 1);
	std::vector<int> r(n + 1);
	
	l[0] = 0;
	for(int i = 1; i < n + 1; ++i) {
		l[i] = euclidean_gcd(l[i - 1], a[i - 1]);
	}

	r[n] = 0;
	for(int i = n - 1; i >= 0; --i) {
		r[i] = euclidean_gcd(r[i + 1], a[i]);
	}
	
	std::vector<int> gcds(n);
	for(int i = 0; i < n; ++i) {
		gcds[i] = euclidean_gcd(l[i], r[i + 1]);
	}

	// max
	int gcd = std::max_element(gcds.begin(), gcds.end());

	// out
	std::cout << gcd << std::endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:43:35: error: cannot convert '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' to 'int' in initialization
   43 |         int gcd = std::max_element(gcds.begin(), gcds.end());
      |                   ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
      |                                   |
      |                                   __gnu_cxx::__normal_iterator<int*, std::vector<int> >
Language: C++

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

int euclidean_gcd(int a, int b) {
	while(a > 0 && b > 0) {
		if(a > b) a -= b;
		else b -= a;
	}
	int ret = (a == 0 ? b : a);
	return ret;
}

int main(void) {
	// input
	int n;
	std::cin >> n;
	std::vector<int> a(n);
	for(int i = 0; i < n; ++i) {
		std::cin >> a[i];
	}
	
	// erase and calc
	std::vector<int> l(n + 1);
	std::vector<int> r(n + 1);
	
	l[0] = 0;
	for(int i = 1; i < n + 1; ++i) {
		l[i] = euclidean_gcd(l[i - 1], a[i - 1]);
	}

	r[n] = 0;
	for(int i = n - 1; i >= 0; --i) {
		r[i] = euclidean_gcd(r[i + 1], a[i]);
	}
	
	std::vector<int> gcds(n);
	for(int i = 0; i < n; ++i) {
		gcds[i] = euclidean_gcd(l[i], r[i + 1]);
	}

	// max
	gcd = std::max_element(gcds.begin(), gcds.end());

	// out
	std::cout << gcd << std::endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:43:9: error: 'gcd' was not declared in this scope; did you mean 'gcds'?
   43 |         gcd = std::max_element(gcds.begin(), gcds.end());
      |         ^~~
      |         gcds
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <map>
#include <stack>
#include <queue>
#include <set>
#include <cstring>

using namespace std;
// ascending order
#define vsort(v) sort(v.begin(), v.end())
// descending order
#define vsort_r(v) sort(v.begin(), v.end(), greater<int>())
#define vunique(v) unique(v.begin(), v.end())
#define mp make_pair
#define ts(x) to_string(x)
#define rep(i, a, b) for(int i = (int)a; i < (int)b; i++)
#define repm(i, a, b) for(int i = (int)a; i > (int)b; i--)
#define bit(a) bitset<8>(a)
#define des_priority_queue priority_queue<int, vector<int>, greater<int> >
typedef long long ll;
typedef pair<int, int> P;
const ll INF = 1e18;

#define MAX_V 1000000

int N;
vector<int> A;
map<int, int> m;

void divisor(int n) {
	for(int i = 1; i * i <= n; i++) {
		if(n % i == 0) {
            m[i]++;
			if(i != n / i) m[n / i]++;
		}
	}
	return res;
}

int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);
    cin >> N;
    rep(i, 0, N) {
        int tmp;
        cin >> tmp;
        A.push_back(tmp);
    }



    rep(i, 0, N) {
        divisor(A[i]);
    }

    int rsl = 1;
    for(auto it = m.begin(); it != m.end(); it++) {
        if(it->second == N - 1 or it->second == N) {
            rsl = max(rsl, it->first);
        }
    }

    cout << rsl << endl;

}


Compiler output:
a.cc: In function 'void divisor(int)':
a.cc:43:16: error: 'res' was not declared in this scope; did you mean 'rep'?
   43 |         return res;
      |                ^~~
      |                rep
Language: C++

#include <iostream>
using namespace std;

int GCD(int a,int b);

int GCD(int a,int b){
  if(a<b){
  int temp =a;
    a=b;
    b=temp;
  }
  a%=b
	if(a==0)
      return b;
  else
  return GCD(b,a);
    
}

int main(){
	int N;
	int PGCD=-1;
  	int max=1000000001;
  cin>>N;
  for(int i=0; i<N; i++){
    int A;
    cin>>A;
    if(i==0){
      PGCD = A;
      max = A;
    }else{
      PGCD = GCD(A,PGCD);
      max = GCD(max,A)>PGCD?GCD(max,A):PGCD;
    }
  }
  
  cout << max <<endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'int GCD(int, int)':
a.cc:12:7: error: expected ';' before 'if'
   12 |   a%=b
      |       ^
      |       ;
   13 |         if(a==0)
      |         ~~
a.cc:15:3: error: 'else' without a previous 'if'
   15 |   else
      |   ^~~~
Language: C++


#include <bits/stdc++.h>

using namespace std;

#define maxn 100000
#define LL long long

LL gcd(LL a,LL b)
{
    if(!b) return a;
    else
        gcd(b,a%b);
}

LL pre[maxn], suf[maxn];
LL a[maxn];

int main() {
    int n;
    cin >> n;
    for (int i = 0; i < n; i++)
        cin >> a[i];
    pre[0] = a[0];
    suf[n - 1] = a[n - 1];
    for (int i = 1; i < n; i++)
        pre[i] = gcd(pre[i - 1], a[i]);
    for (int i = n - 2; i >= 0; i--)
        suf[i] = gcd(suf[i + 1], a[i]);
    if (n == 2) { cout << pre[1]; return 0; }
    LL best = 1;
    for (int i = 0; i < n - 2; i++)
        best = max(best, gcd(pre[i], suf[i + 2]));
    best = max(best, max(pre[n - 2], suf[1]);
    cout << best;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:45: error: expected ')' before ';' token
   34 |     best = max(best, max(pre[n - 2], suf[1]);
      |               ~                             ^
      |                                             )
a.cc: In function 'long long int gcd(long long int, long long int)':
a.cc:13:12: warning: control reaches end of non-void function [-Wreturn-type]
   13 |         gcd(b,a%b);
      |         ~~~^~~~~~~
Language: Java

import java.util.Scanner;

public class Try {

    static int gcd(int a, int b){
        if(b == 0) return a;
        return gcd(b, a % b);
    }

    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] a = new int[n];
        int[] g = new int[n];
        int[] g2 = new int[n];
        for(int i = 0; i < n; i++){
            a[i] = sc.nextInt();
            if(i != 0) g[i] = gcd(g[i - 1], a[i]);
            else g[i] = a[i];
        }
        g2[n - 1] = a[n - 1];
        for(int i = n - 2; i >= 0; i--){
            g2[i] = gcd(g2[i + 1], a[i]);
        }
//        for(int i = 0; i < n; i++){
//            System.out.print(g2[i] + " ");
//        }
        int ans = Math.max(g2[1], g[n - 2]);
        for(int i = 1; i < n - 1; i++){
            int to = gcd(g[i - 1], g2[i + 1]);
            ans = Math.max(ans, to);
        }
        System.out.print(ans);
    }
}


Compiler output:
Main.java:3: error: class Try is public, should be declared in a file named Try.java
public class Try {
       ^
1 error
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define maxn 1e5
#define LL long long

LL gcd(LL a,LL b)
{
    if(!b) return a;
    else
        gcd(b,a%b);
}

LL a[maxn];

int main() {
  int n;
  cin >> n;
  for (int i = 0; i < n; i++)
    cin >> a[i];
  LL m;
  for (int i = 0; i < n - 1; i++) 
    m = max(gcd(a[i], a[i + 1]), m);
  cout << m;
  return 0;
}  

Compiler output:
a.cc:5:14: error: conversion from 'double' to 'long unsigned int' in a converted constant expression
    5 | #define maxn 1e5
      |              ^~~
a.cc:15:6: note: in expansion of macro 'maxn'
   15 | LL a[maxn];
      |      ^~~~
a.cc:5:14: error: could not convert '1.0e+5' from 'double' to 'long unsigned int'
    5 | #define maxn 1e5
      |              ^~~
      |              |
      |              double
a.cc:15:6: note: in expansion of macro 'maxn'
   15 | LL a[maxn];
      |      ^~~~
a.cc:5:14: error: size of array 'a' has non-integral type 'double'
    5 | #define maxn 1e5
      |              ^~~
a.cc:15:6: note: in expansion of macro 'maxn'
   15 | LL a[maxn];
      |      ^~~~
a.cc: In function 'long long int gcd(long long int, long long int)':
a.cc:12:12: warning: control reaches end of non-void function [-Wreturn-type]
   12 |         gcd(b,a%b);
      |         ~~~^~~~~~~
Language: C++

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

int main() 
{
	int a,b,t; 
	cin>>a>>b>>t;
	
	int generated_times=t/a;
	int ans=generated_times*B;
	
	cout<<ans<<"\n";
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:33: error: 'B' was not declared in this scope
   10 |         int ans=generated_times*B;
      |                                 ^
Language: C++

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

int gcd(int a, int b){
	if(a == 0 || b == 0)
		return a+b;
	return gcd(b, a%b);
}

int main(){
	int N;
	cin >> N;
	vector<int> A(N+1), L(N), R(N);
	for(int i = 0; i < N; i++)
		cin >> A.at(i);

	int maxi = 0;
	for(int i = 0; i < N+1; i++){
		L.at(i+1) = gcd(L.at(i), A.at(i));
		R.at(i) = gcd(R.at(i+1), A.at(i));
	}
	for(int i = 0; i < N; i++){
		int part = gcd(L.at(i), R.at(i+1)):
		if(maxi < part)
			maxi = part;
	}
	
	cout << maxi << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:51: error: expected ',' or ';' before ':' token
   23 |                 int part = gcd(L.at(i), R.at(i+1)):
      |                                                   ^
Language: C++

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

int gcd(int a, int b){
	if(a == 0 || b == 0)
		return a+b;
	return gcd(b, a%b);
}

int main(){
	int N;
	cin >> N;
	vector<int> A(N+1), L(N), R(N);
	for(int i = 0; i < N; i++)
		cin >> A.at(i);

	int maxi = 0;
	for(int i = 0; i < N+1; i++){
		L.at(i+1) = gcd(L.at(i), A.at(i));
		R.at(i) = gcd(R.at(i+1), A.at(i));
	}
	for(int i = 0; i < N; i++){
		part = gcd(L.at(i), R.at(i+1)):
		if(maxi < part)
			maxi = part;
	}
	
	cout << maxi << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:17: error: 'part' was not declared in this scope
   23 |                 part = gcd(L.at(i), R.at(i+1)):
      |                 ^~~~
Language: C++

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

int gcd(int a, int b){
	if(b == 0)
		return a;
	int r = a%b;
	while(r){
		a = b;
		b = r;
		r = a%b;
	}
	return b;
}

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

	int maxi = 0;
	for(int i = 0; i < N; i++){
		int part = 0;
		for(int j = 0; j < N; j++){
			if(i == j)
				continue;
			part = gcd(A.at(j), part);
		}
		if(maxi < gcd)
			maxi = gcd;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:25: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<'
   31 |                 if(maxi < gcd)
      |                    ~~~~~^~~~~
a.cc:32:32: error: cannot resolve overloaded function 'gcd' based on conversion to type 'int'
   32 |                         maxi = gcd;
      |                                ^~~
Language: C++

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

int gcd(int a, int b){
	if(b == 0)
		return a;
	int r = a%b;
	while(r){
		a = b;
		b = r;
		r = a%b;
	}
	return b;
}

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

	int maxi = 0;
	for(int i = 0; i < N; i++){
		int gcd = 0;
		for(int j = 0; j < N; j++){
			if(i == j)
				continue;
			gcd = gcd(A.at(j), gcd);
		}
		if(maxi < gcd)
			maxi = gcd;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:34: error: 'gcd' cannot be used as a function
   29 |                         gcd = gcd(A.at(j), gcd);
      |                               ~~~^~~~~~~~~~~~~~
Language: C++

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

int gcd(a, b){
	if(b == 0)
		return a;
	int r = a%b;
	while(r){
		a = b;
		b = r;
		r = a%b;
	}
	return b;
}

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

	int maxi = 0;
	for(int i = 0; i < N; i++){
		int gcd = 0;
		for(int j = 0; j < N; j++){
			if(i == j)
				continue;
			gcd = gcd(A.at(j), gcd);
		}
		if(maxi < gcd)
			maxi = gcd;
	}
}

Compiler output:
a.cc:4:9: error: 'a' was not declared in this scope
    4 | int gcd(a, b){
      |         ^
a.cc:4:12: error: 'b' was not declared in this scope
    4 | int gcd(a, b){
      |            ^
a.cc:4:13: error: expression list treated as compound expression in initializer [-fpermissive]
    4 | int gcd(a, b){
      |             ^
a.cc: In function 'int main()':
a.cc:29:34: error: 'gcd' cannot be used as a function
   29 |                         gcd = gcd(A.at(j), gcd);
      |                               ~~~^~~~~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
// {	ios_base::sync_with_stdio(false);
// 	cin.tie(NULL);
// 	cout.tie(NULL);
// 	#ifndef ONLINE_JUDGE
//     	freopen("input.txt", "r", stdin);
//     	freopen("output.txt", "w", stdout);
// 	#endif
    int n;cin>>n;
    int a[n];
    int pre[n]={0},suf[n]={0};
    for(int i = 0;i<n;i++){
    	cin>>a[i];
        if(i!=0)
    	   pre[i]=__gcd(a[i],pre[i-1]);
        if(i==0)
            pre[i]=a[0];
    }
    suf[n-1]=a[n-1];
    for(int i=n-2;i>=0;i--){
        suf[i]=__gcd(a[i],suf[i+1]);
    }
    int ans = 0;
    for(int i=1;i<n-1;i++){
        ans=max(ans,__gcd(a[i-1],a[i+1]));
    }
    ans=max(ans,pre[n-2]);
    ans=max(ans,suf[1]);
    
    cout<<ans;
}

Compiler output:
a.cc:11:5: error: expected initializer before 'int'
   11 |     int n;cin>>n;
      |     ^~~
a.cc:11:11: error: 'cin' does not name a type
   11 |     int n;cin>>n;
      |           ^~~
a.cc:12:11: error: 'n' was not declared in this scope; did you mean 'yn'?
   12 |     int a[n];
      |           ^
      |           yn
a.cc:13:13: error: 'n' was not declared in this scope; did you mean 'yn'?
   13 |     int pre[n]={0},suf[n]={0};
      |             ^
      |             yn
a.cc:13:24: error: 'n' was not declared in this scope; did you mean 'yn'?
   13 |     int pre[n]={0},suf[n]={0};
      |                        ^
      |                        yn
a.cc:14:5: error: expected unqualified-id before 'for'
   14 |     for(int i = 0;i<n;i++){
      |     ^~~
a.cc:14:19: error: 'i' does not name a type
   14 |     for(int i = 0;i<n;i++){
      |                   ^
a.cc:14:23: error: 'i' does not name a type
   14 |     for(int i = 0;i<n;i++){
      |                       ^
a.cc:21:5: error: 'suf' does not name a type
   21 |     suf[n-1]=a[n-1];
      |     ^~~
a.cc:22:5: error: expected unqualified-id before 'for'
   22 |     for(int i=n-2;i>=0;i--){
      |     ^~~
a.cc:22:19: error: 'i' does not name a type
   22 |     for(int i=n-2;i>=0;i--){
      |                   ^
a.cc:22:24: error: 'i' does not name a type
   22 |     for(int i=n-2;i>=0;i--){
      |                        ^
a.cc:26:5: error: expected unqualified-id before 'for'
   26 |     for(int i=1;i<n-1;i++){
      |     ^~~
a.cc:26:17: error: 'i' does not name a type
   26 |     for(int i=1;i<n-1;i++){
      |                 ^
a.cc:26:23: error: 'i' does not name a type
   26 |     for(int i=1;i<n-1;i++){
      |                       ^
a.cc:29:5: error: 'ans' does not name a type
   29 |     ans=max(ans,pre[n-2]);
      |     ^~~
a.cc:30:5: error: 'ans' does not name a type
   30 |     ans=max(ans,suf[1]);
      |     ^~~
a.cc:32:5: error: 'cout' does not name a type
   32 |     cout<<ans;
      |     ^~~~
a.cc:33:1: error: expected declaration before '}' token
   33 | }
      | ^
Language: Java

import java.util.Scanner;
public class MAin {
    public static void main(String args[]) {
        Scanner s = new Scanner(System.in);
        int N = s.nextInt();
        int[] A = new int[N];
        
        for (int i = 0; i < N; i++) {
            A[i] = s.nextInt();
        }
        int gcd = 1;
        for (int i = 0; i < N; i++) {
            int newGcd = gcd(removeElement(A, i));
            if (newGcd > gcd) {
                gcd = newGcd;
            }
        }
        System.out.print(gcd);
    }
    
    public static int[] removeElement(int[] arr, int index) {
        int l = arr.length - 1;
        int r[] = new int[l];
        for (int i = 0; i < l; i++) {
            if(i >= index) {
                r[i] = arr[i+1];
            } else {
                r[i] =  arr[i];
            }
        }
        return r;
    }
    
    public static int gcd(int arr[]) {
        int l = arr.length;
        int result = arr[0]; 
        for (int i = 1; i < l; i++) 
            result = getGCD(arr[i], result); 
  
        return result; 
    }
    
    public static int getGCD(int a, int b) {
     if (b == 0) { return a; }
     else { return getGCD(b, a%b); }
    }
}


Compiler output:
Main.java:2: error: class MAin is public, should be declared in a file named MAin.java
public class MAin {
       ^
1 error
Language: C

#include <stdio.h>
int main(){
	int N;
  	int A[N];
  	int i=0;
  	scanf("%d",&N);
  	for (i=0;i<N;i++) scanf("%d",&A[i]);
	for(i=0;i<N-1;i++){A[i+1]=gcd(A[i],A[i+1]);A[i]=1;}
  	printf("%d",A[N-1]);
  	return 0;
}
int gcd(int x,int y){
	while((x>=1)&&(y>=1)) inv_cd(&x,&y);
  	if(x<=1){return y;}
  	else{return x;}
}
int inv_cd(int *px,int *py){
	if(*px>*py){while(*px>*py){*px=*px-*py;}};
  	else{while(*px<=*py){*py=*py-*px;}};
  	return 0;
}


Compiler output:
main.c: In function 'main':
main.c:8:35: error: implicit declaration of function 'gcd' [-Wimplicit-function-declaration]
    8 |         for(i=0;i<N-1;i++){A[i+1]=gcd(A[i],A[i+1]);A[i]=1;}
      |                                   ^~~
main.c: In function 'gcd':
main.c:13:31: error: implicit declaration of function 'inv_cd' [-Wimplicit-function-declaration]
   13 |         while((x>=1)&&(y>=1)) inv_cd(&x,&y);
      |                               ^~~~~~
main.c: In function 'inv_cd':
main.c:19:9: error: 'else' without a previous 'if'
   19 |         else{while(*px<=*py){*py=*py-*px;}};
      |         ^~~~
Language: C

#include <stdio.h>
int main(){
	int N;
  	int A[N];
  	int i=0;
  	scanf("%d",&N);
  	for (i=0;i<N;i++) scanf("%d",&A[i]);
	for(i=0;i<N;i++){A[i+1]=gcd(A[i],A[i+1]);A[i]=1;}
  	printf("%d",A[N-1]);
  	return 0;
}
int gcd(int x,int y){
	while((x>=1)&&(y>=1)) inv_cd(&x,&y);
  	if(x<=1){return y;}
  	else{return x;}
}
int inv_cd(int *px,int *py){
	if(*px>*py){while(*px>*py){*px=*px-*py;}};
  	else{while(*px<=*py){*py=*py-*px;}};
  	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:33: error: implicit declaration of function 'gcd' [-Wimplicit-function-declaration]
    8 |         for(i=0;i<N;i++){A[i+1]=gcd(A[i],A[i+1]);A[i]=1;}
      |                                 ^~~
main.c: In function 'gcd':
main.c:13:31: error: implicit declaration of function 'inv_cd' [-Wimplicit-function-declaration]
   13 |         while((x>=1)&&(y>=1)) inv_cd(&x,&y);
      |                               ^~~~~~
main.c: In function 'inv_cd':
main.c:19:9: error: 'else' without a previous 'if'
   19 |         else{while(*px<=*py){*py=*py-*px;}};
      |         ^~~~
Language: C++

#include <iostream>
#include <vector>

using namespace std;

int main(){
  int N;
  cin >> N;
  vector<int> A(N);
  for(int i=0; i<N; i++)
    cin >> A[i];
  
  int max = A[0];
  for(int i=1; i<N; i++){
  	if(max < A[i])
      max = A[i];
  }
  
  int ans = 1;
  int count, flag;
  for(int i=2; i<=max ;i++){
    count = 0;
    flag = 0;
  	for(int j=0; j<N; j++){
    	if(a[j] % i != 0)
          count++;
      	if(count >= 2){
          flag = 1;
          break;
        }
    }
    if(flag == 0)
      ans = i;
    
  }
  
  cout << ans << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:25:12: error: 'a' was not declared in this scope
   25 |         if(a[j] % i != 0)
      |            ^
Language: C++

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

int main(){
  int N,r,max;
  cin >> N;
  vector<int> count(N+1);
  for(int i=0;i<N;i++){
    cin>>count.at(i);  
  }

  for(int i=0; i<N;i++){
    
    if(count.at(i+1) == nullptr) break;
    
    if(count.at(i)==count.at(i+1)){
      max = count.at(i);
      break;
    }
    
    r=count.at(i) % count.at(i+1);
    
    while(r !=0){
      count.at(i)=count.at(i+1);  
      count.at(i+1)=r;
      r=count.at(i)%count.at(i+1);
      max = count.at(i+1);
      
    }
  }



    cout<< max <<endl;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:14:22: error: invalid operands of types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'} and 'std::nullptr_t' to binary 'operator=='
   14 |     if(count.at(i+1) == nullptr) break;
      |        ~~~~~~~~~~~~~~^~~~~~~~~~
Language: C

#include <stdio.h>
int yu(int a,int b);

int main(void){
	int n,i,max=0;
	scanf("%d",&n);
	int all[n];
	int h[n+1];
	int m[n+1];
	h[0] = 0; m[n] = 0;
	for(i=0;i<n;i++) scanf("%d",&all[i]);
	for(i=0;i<n;i++) h[i+1] = yu(h[i],all[i]);
	for(i=n-1;i>=0;i--) m[i] = yu(m[i+1],all[i]);
	
	for(i=0;i<n;i++){
		if(yu(h[i],m[i+1])>=max) max = yu(h[i],m[i+1]);
	}
	printf("%d\n",max);
	return 0;
}
int yu(int a,int b){
	int r;
	if(a>b){
		r = b;
		b = a;
		a = r;
	if(a==0) return b;
	else return yu(b%a,a);
}

Compiler output:
main.c: In function 'yu':
main.c:29:1: error: expected declaration or statement at end of input
   29 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int a[100010];
int num[5300001];
int gcd(int a,int b)
{
    return b>0?gcd(b,a%b):a;
}
int main()
{
    int n;
    while(~scanf("%d",&n))
    {
        for(int i=0;i<n;i++)
        {
            scanf("%d",&a[i]);
            if((a[i]+a[i-1])%2)
            {
                if(num[i-1]!=1) a[i]=a[i-1];
            }
            num[i]=gcd(a[i],a[i-1]);a
        }
        cout<<num[n-1]<<endl;
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:38: error: expected ';' before '}' token
   21 |             num[i]=gcd(a[i],a[i-1]);a
      |                                      ^
      |                                      ;
   22 |         }
      |         ~
Language: C++

#include <bits/stdc++.h>

#define ff first
#define ss second
#define mp make_pair

using namespace std;

typedef long long ll;

// uniform_int_distribution<int>
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());

int v[100005], l[100005], r[100005];

int gcd(int a, int b) {
	return b ? gcd(b, a%b) : a;
}

int main() {
	int n;

	scanf("%d", &n);

	int ans = 0;
	for(int i = 1; i <= n; i++)
		scanf("%d", &v[i]);

	int ans = 0;
	for(int i = 1; i <= n; i++)
		l[i] = gcd(l[i-1], v[i]);

	for(int i = n; i; i--)
		l[i] = gcd(r[i+1], v[i]);

	for(int i = 1; i <= n; i++)
		ans = max(ans, gcd(l[i-1], r[i+1]));

	printf("%d\n", ans);

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:13: error: redeclaration of 'int ans'
   29 |         int ans = 0;
      |             ^~~
a.cc:25:13: note: 'int ans' previously declared here
   25 |         int ans = 0;
      |             ^~~
Language: C++

#include <cstdio>
#include <iostream>
#include <vector>

int numberOfIntegers;

int gcd(int m,int n){
    if(m < n){
        n = n % m;
    }
    while(n != 0){
        int n0 = n;
        n = m % n;
        m = n0;
    }
    return m;
}

//int gcdSkippedAt(int skipID,std::vector<int>& num){
int gcdSkippedAt(int skipID,int[] num){
    if(num.size() == 1){
        return num[0];
    }
    int g = num[0];
    if(skipID == 0){
        g = num[1];
    }
    for(int i=0;i<numberOfIntegers;++i){
        if(i == skipID){
            continue;
        }
        g = gcd(num[i],g);
        if(g == 1){
            break;
        }
    }
    return g;
}

int main(){
    scanf("%d",&numberOfIntegers);

//    std::vector<int> nums(numberOfIntegers);
    int nums[numberOfIntegers];
    for(int i=0;i<numberOfIntegers;++i){
        scanf("%d",&nums[i]);
    }
    
    int ans = 0;
    for(int i=0;i<numberOfIntegers;++i){
        int g = gcdSkippedAt(i,nums);
        if(g > ans){
            ans = g;
        }
    }
    std::cout << ans << std::endl;
    return 0;
}

Compiler output:
a.cc:20:35: error: expected ',' or '...' before 'num'
   20 | int gcdSkippedAt(int skipID,int[] num){
      |                                   ^~~
a.cc: In function 'int gcdSkippedAt(int, int*)':
a.cc:21:8: error: 'num' was not declared in this scope; did you mean 'enum'?
   21 |     if(num.size() == 1){
      |        ^~~
      |        enum
a.cc:24:13: error: 'num' was not declared in this scope; did you mean 'enum'?
   24 |     int g = num[0];
      |             ^~~
      |             enum
Language: C++

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

using namespace std;
vector<int> A;
vector<int> bucket;
int bs;

int gcd(int a, int b) {
    return b ? gcd(b, a % b) : a;
}

void update(int i, int x) {
    bucket[i / bs] = gcd(bucket[i / bs], x);
}

// get gcd(A[0], A[1], ..., A[j - 1], A[j + 1], ..., A[N - 1])
int get(int j) {
    int ret = 0;
    int l = 0;
    int r = A.size();
    for(int i = l; i < r; ) {
        if (i != j) continue;
        int bi = i / bs;
        if (l <= bs * bi && bs * (bi + 1) <= r) {
            ret = gcd(ret, bucket[bi]);
            i += bs;
        } else {
            ret = gcd(ret, A[i]);
            i++;
        }
    }
    return ret;
}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

using namespace std;
vector<int> A;
vector<int> bucket;
int bs;

int gcd(int a, int b) {
    return b ? gcd(b, a % b) : a;
}

void update(int i, int x) {
    bucket[i / bs] = gcd(bucket[i / bs], x);
}

// get gcd(A[0], A[1], ..., A[j - 1], A[j + 1], ..., A[N - 1])
int get(int j) {
    int ret = 0;
    int l = 0;
    int r = A.size();
    for(int i = l; i < r; ) {
        if (i != j) continue;
        int bi = i / bs;
        if (l <= bs * bi && bs * (bi + 1) <= r) {
            ret = gcd(ret, bucket[bi]);
            i += bs;
        } else {
            ret = gcd(ret, A[i]);
            i++;
        }
    }
    return ret;
}



int main() {
    int N;
    cin >> N;
    A.resize(N);
    bs = (int)sqrt(N);
    
    bucket.resize(N / bs);
    
    for(int i = 0; i < N; i++) {
        cin >> A[i];
        update(i, A[i]);
    }
    
    int ans = 0;
    for(int i = 0; i < N; i++) {
        ans = max(ans, get(i));
    }
    
    cout << ans << endl;
    
    return 0;
}

Compiler output:
a.cc:2:1: error: 'vector' does not name a type
    2 | vector<int> A;
      | ^~~~~~
a.cc:3:1: error: 'vector' does not name a type
    3 | vector<int> bucket;
      | ^~~~~~
a.cc: In function 'void update(int, int)':
a.cc:11:5: error: 'bucket' was not declared in this scope
   11 |     bucket[i / bs] = gcd(bucket[i / bs], x);
      |     ^~~~~~
a.cc: In function 'int get(int)':
a.cc:18:13: error: 'A' was not declared in this scope
   18 |     int r = A.size();
      |             ^
a.cc:23:28: error: 'bucket' was not declared in this scope
   23 |             ret = gcd(ret, bucket[bi]);
      |                            ^~~~~~
a.cc: In function 'int main()':
a.cc:37:5: error: 'cin' was not declared in this scope
   37 |     cin >> N;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:38:5: error: 'A' was not declared in this scope
   38 |     A.resize(N);
      |     ^
a.cc:39:15: error: 'sqrt' was not declared in this scope
   39 |     bs = (int)sqrt(N);
      |               ^~~~
a.cc:41:5: error: 'bucket' was not declared in this scope
   41 |     bucket.resize(N / bs);
      |     ^~~~~~
a.cc:50:15: error: 'max' was not declared in this scope
   50 |         ans = max(ans, get(i));
      |               ^~~
a.cc:53:5: error: 'cout' was not declared in this scope
   53 |     cout << ans << endl;
      |     ^~~~
a.cc:53:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:53:20: error: 'endl' was not declared in this scope
   53 |     cout << ans << endl;
      |                    ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C++

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

using namespace std;

long gcd(long a , long b)
{
   if(b==0) return a;
   a%=b;
   return gcd(b,a);
}

int main(void) {

	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	
	int num = 0;
	cin >> num; cin.ignore();

 	vector<long> input(num);

	for(int i = 0; i < input.size(); i++) {
		cin >> input[i];
	}

	vector<long> L(num+1, 0);
	for(int i = 0; i < num; i++) {
		if(i!=0)L[i] = gcd(L[i-1],input[i]);
		else L[i] = input[i];
	}

	vector<long> R(num+1, 0);
	for( int i = num - 1; i >= 0; --i ) {
        if( i != num - 1 ) R[i] = gcd( R[i + 1], input[i] );
		else R[i] = R[i];
	}

    int ans = R[1];
    for( int i = 1; i < num - 1; ++i ) {
        ans = std::max( gcd( L[i - 1], R[i + 1] ), ans );
 
    }

	cout << ans;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:42:23: error: no matching function for call to 'max(long int, int&)'
   42 |         ans = std::max( gcd( L[i - 1], R[i + 1] ), ans );
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:42:23: note:   deduced conflicting types for parameter 'const _Tp' ('long int' and 'int')
   42 |         ans = std::max( gcd( L[i - 1], R[i + 1] ), ans );
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:42:23: note:   mismatched types 'std::initializer_list<_Tp>' and 'long int'
   42 |         ans = std::max( gcd( L[i - 1], R[i + 1] ), ans );
      |               ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Language: C++

int gcd(int a, int b) {
	if (a < b) {
		swap(a, b);
	}
	if(a % b == 0){
		return b;
	}
	else {
		return gcd(b, a % b);
	}
}

Compiler output:
a.cc: In function 'int gcd(int, int)':
a.cc:3:17: error: 'swap' was not declared in this scope
    3 |                 swap(a, b);
      |                 ^~~~
Language: C++

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

int gcd(int a, int b) {
;
	if(max(a, b) % min(a, b)==0){
		return min(a, b);
	}
	else {
		return gcd(min(a, b), max(a, b) % min(a, b));
	}
}

int main() {
	int N;
	cin >> N;
	vector<int> vec(N);
	for (int i = 0; i < N; i++) {
		cin >> vec.at(i);
	}
	if (N == 2) {
		cout << gcd(vec.at(0), vec.at(1)) << endl;
	}
	else {
		int maxi = 1;
		vector<int> gcd_memorized_from_first(N - 1);
		int gcd_memorized_from_end = vec.at(N - 1);
		int G = vec.at(0);
		for (int i = 0; i < N - 1; i++) {
			G = gcd(G, vec.at(i));
			gcd_memorized_from_first.at(i) = G;
		}
        maxi = max(maxi, G);
		for (int i = 0; i < N - 2; i++) {
			gcd_memorized_from_end = gcd(vec.at(N - i - 1), gcd_memorized_from_end);
			G = gcd(gcd_memorized_from_first.at(N - i - 3), gcd_memorized_from_end);
			maxi = max(maxi, G);
		}
        G = gcd(vec.at(1), gcd_memorized_from_end)
        maxi = max(maxi, G);
		cout << maxi << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:39:51: error: expected ';' before 'maxi'
   39 |         G = gcd(vec.at(1), gcd_memorized_from_end)
      |                                                   ^
      |                                                   ;
   40 |         maxi = max(maxi, G);
      |         ~~~~
Language: C++

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

int gcd(int a, int b) {
;
	if(max(a, b) % min(a, b)==0){
		return min(a, b);
	}
	else {
		return gcd(min(a, b), max(a, b) % min(a, b));
	}
}

int main() {
	int N;
	cin >> N;
	vector<int> vec(N);
	for (int i = 0; i < N; i++) {
		cin >> vec.at(i);
	}
	if (N == 2) {
		cout << gcd(vec.at(0), vec.at(1)) << endl;
	}
	else {
		int maxi = 1;
		vector<int> gcd_memorized_from_first(N - 1);
		int gcd_memorized_from_end = vec.at(N - 1);
		int G = vec.at(0);
		for (int i = 0; i < N - 1; i++) {
			G = gcd(G, vec.at(i));
			gcd_memorized_from_first.at(i) = G
		}
		for (int i = 0; i < N - 3; i++) {
			gcd_memorized_from_end = gcd(vec.at(N - i - 1), gcd_memorized_from_end);
			G = gcd(gcd_memorized_from_first.at(N - i - 3), gcd_memorized_from_end);
			maxi = max(maxi, G);
		}
		G = gcd(vec.at(1), gcd_memorized_from_end);
		maxi = max(maxi, G);
		cout << maxi << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:59: error: expected ';' before '}' token
   31 |                         gcd_memorized_from_first.at(i) = G
      |                                                           ^
      |                                                           ;
   32 |                 }
      |                 ~
Language: C++

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

int gcd(int A, int B) {
  if (B == 0) {
    return A;
  }
  else {
    int s = A % B;
    return gcd(B, s);
  }
}

int main() {
  int N;
  cin >> N;
  vector<int>A(N);
  vector<vector<int>>B(N,vector<int>(N));
  for (int i = 0; i < N; i++) {
    cin >> A.at(i);
  }
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < N; j++) {
      if (i != j) {
        B.at(i).at(j) = A.at(i);
      }
      else if(j == 0) {
        B.at(i).at(j) = A.at(N-1);
      }
      else {
        B.at(i).at(j) = A.at(i-1);
      }
    }
  }
  for (int i = 0; i < N; i++) {
    for (int j = 1; j < N; j++) {
      B.at(i).at(j) = gcd(B.at(i).at(j-1),B.at(i).at(j));
    }
  }
  int ans = 0
  for (int i = 0; i < N; i++) {
    ans = max(ans,B.at(i).at(N-1));
  }
  cout << ans << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:41:3: error: expected ',' or ';' before 'for'
   41 |   for (int i = 0; i < N; i++) {
      |   ^~~
a.cc:41:19: error: 'i' was not declared in this scope
   41 |   for (int i = 0; i < N; i++) {
      |                   ^
Language: C++

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

/*
int algcd_i(vector<int>A, int i) {
  if (i == A.size()) {
    return A.at(i);
  }
  int s = algcd_i(A, i+1);
  return gcd(A.at(i), s)
}

int algcd(vector<int>A,int N) {
  return algcd_i(A, 0);
}
*/

int main() {
  int N;
  cin >> N;
  vector<int>A(N);
  vector<vector<int>>B(N,vector<int>(N));
  for (int i = 0; i < N; i++) {
    cin >> A.at(i);
  }
  for (int i = 0; i < N; i++) {
    for (int j = 0; j < N; j++) {
      if (i != j) {
        B.at(i).at(j) = A.at(i);
      }
      else if(j == 0) {
        B.at(i).at(j) = A.at(N-1);
      }
      else {
        B.at(i).at(j) = A.at(i-1);
      }
    }
  }
  for (int i = 0; i < N; i++) {
    for (int j = 1; j < N; j++) {
      B.at(i).at(j) = gcd(B.at(i).at(j-1),B.at(i).at(j));
    }
  }
  int ans = 0
  for (int i = 0; i < N; i++) {
    ans = max(ans,B.at(i).at(N-1));
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:45:3: error: expected ',' or ';' before 'for'
   45 |   for (int i = 0; i < N; i++) {
      |   ^~~
a.cc:45:19: error: 'i' was not declared in this scope
   45 |   for (int i = 0; i < N; i++) {
      |                   ^
Language: C++

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

int gcd(int a, int b) {
;
	if(max(a, b) % min(a, b)==0){
		return min(a, b);
	}
	else{
		return gcd(min(a, b), max(a, b) % min(a, b));
    }
}

int main() {
	int N;
	cin >> N;
	vector<int> vec(N + 1);
	for (int i = 0; i < N; i++) {
		cin >> vec.at(i);
		vec.at(N +) = vec.at(0);
	}
	int maxi = 1;
	for (int i = 0; i < N; i++) {
		int G = vec.at(i + 1);
		for (int k = 0; k < N; k++) {
			if (k != i) {
				continue;
			}
			else {
				G = gcd(G, vec.at(k));
			}
		}
		maxi = max(maxi, G);
	}
	cout << maxi << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:27: error: expected primary-expression before ')' token
   20 |                 vec.at(N +) = vec.at(0);
      |                           ^
Language: C++

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

int gcd(int a, int b) {
;
	if(max(a, b) % min(a, b)==0){
		return min(a, b);
	}
	else{
		return gcd(min(a, b), max(a, b) % min(a, b));
}

int main() {
	int N;
	cin >> N;
	vector<int> vec(N + 1);
	for (int i = 0; i < N; i++) {
		cin >> vec.at(i);
		vec.at(N +) = vec.at(0);
	}
	int maxi = 1;
	for (int i = 0; i < N; i++) {
		int G = vec.at(i + 1);
		for (int k = 0; k < N; k++) {
			if (k != i) {
				continue;
			}
			else {
				G = gcd(G, vec.at(k));
			}
		}
		maxi = max(maxi, G);
	}
	cout << maxi << endl;
}


Compiler output:
a.cc: In function 'int gcd(int, int)':
a.cc:13:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   13 | int main() {
      |         ^~
a.cc:13:9: note: remove parentheses to default-initialize a variable
   13 | int main() {
      |         ^~
      |         --
a.cc:13:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:13:12: error: a function-definition is not allowed here before '{' token
   13 | int main() {
      |            ^
a.cc:35:2: error: expected '}' at end of input
   35 | }
      |  ^
a.cc:4:23: note: to match this '{'
    4 | int gcd(int a, int b) {
      |                       ^