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

#include<iostream>


int main(){
    
    cout << "AGC" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |     cout << "AGC" << endl;
      |     ^~~~
      |     std::cout
In file included from a.cc:1:
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:22: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |     cout << "AGC" << endl;
      |                      ^~~~
      |                      std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

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

int main(){
  stack<int>s;
  stack<int>t;
  int n,b[100]; cin>>n;
  int i=n,c,d;
  for(int i=n;i>=1;i--)
    cin>>b[i];
  while(i>=1){
  if(b[i]>i){
    cout<<-1<<endl;
  }
  else if(b[i]==1&&b[i+1]!=1){
   for(int x=i;x<=n;x++){
     s.push(b[x]);
     if(b[x]>b[x+1]){
       s.pop();
       while(b[x+1]==b[x-1]){
         c=s.top;
         t.push(c);
         s.pop();
         b[x+1]--;
       }
       int a=x+1;
       for(a;a<=n;a++){
         if(b[a]<b[x]){
           s.push(b[a]);
         }
       }
       while(t.size()>0){
       d=t.top();
       s.push(d);
       t.pop();
       }
     }
    }   
  }
  }
    i--;
   }
  cout<<s<<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:14: error: cannot resolve overloaded function 'top' based on conversion to type 'int'
   22 |          c=s.top;
      |              ^~~
a.cc: At global scope:
a.cc:44:3: error: 'cout' does not name a type
   44 |   cout<<s<<endl;
      |   ^~~~
a.cc:45:3: error: expected unqualified-id before 'return'
   45 |   return 0;
      |   ^~~~~~
a.cc:46:1: error: expected declaration before '}' token
   46 | }
      | ^
Language: C++

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

int main(){
  stack<int>s;
  stack<int>t;
  int n,b[100]; cin>>n;
  int i=n;
  for(int i=n;i>=1;i--)
    cin>>b[i];
  while(i>=1){
  if(b[i]>i){
    cout<<-1<<endl;
  }
  else if(b[i]==1&&b[i+1]!=1){
   for(int x=i;x<=n;x++){
     s.push(b[x]);
     if(b[x]>b[x+1]){
       s.pop();
       while(b[x+1]==b[x-1]){
         c=s.top;
         t.push(c);
         s.pop();
         b[x+1]--;
       }
       int a=x+1;
       for(a;a<=n;a++){
         if(b[a]<b[x]){
           s.push(b[a]);
         }
       }
       s.push(t);
     }
    }   
  }
  }
    i--;
   }
  cout<<s<<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:10: error: 'c' was not declared in this scope
   22 |          c=s.top;
      |          ^
a.cc:33:14: error: no matching function for call to 'std::stack<int>::push(std::stack<int>&)'
   33 |        s.push(t);
      |        ~~~~~~^~~
In file included from /usr/include/c++/14/stack:63,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_stack.h:258:7: note: candidate: 'void std::stack<_Tp, _Sequence>::push(const value_type&) [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >; value_type = int]'
  258 |       push(const value_type& __x)
      |       ^~~~
/usr/include/c++/14/bits/stl_stack.h:258:30: note:   no known conversion for argument 1 from 'std::stack<int>' to 'const std::stack<int>::value_type&' {aka 'const int&'}
  258 |       push(const value_type& __x)
      |            ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_stack.h:263:7: note: candidate: 'void std::stack<_Tp, _Sequence>::push(value_type&&) [with _Tp = int; _Sequence = std::deque<int, std::allocator<int> >; value_type = int]'
  263 |       push(value_type&& __x)
      |       ^~~~
/usr/include/c++/14/bits/stl_stack.h:263:25: note:   no known conversion for argument 1 from 'std::stack<int>' to 'std::stack<int>::value_type&&' {aka 'int&&'}
  263 |       push(value_type&& __x)
      |            ~~~~~~~~~~~~~^~~
a.cc: At global scope:
a.cc:40:3: error: 'cout' does not name a type
   40 |   cout<<s<<endl;
      |   ^~~~
a.cc:41:3: error: expected unqualified-id before 'return'
   41 |   return 0;
      |   ^~~~~~
a.cc:42:1: error: expected declaration before '}' token
   42 | }
      | ^
Language: C++

#include <string>
#include <bits/stdc++.h>
#include <stack>
#include <queue>
#include <cstdio>
using namespace std;
typedef long long ll;
typedef pair<int,int> P;
typedef pair<int,P> P1;
typedef pair<P,P> P2;
#define pu push
#define pb push_back
#define mp make_pair
#define eps 1e-7
#define INF 1000000000
#define mod 1000000007
#define fi first
#define sc second
#define rep(i,x) for(int i=0;i<x;i++)
#define repn(i,x) for(int i=1;i<=x;i++)
#define SORT(x) sort(x.begin(),x.end())
#define ERASE(x) x.erase(unique(x.begin(),x.end()),x.end())
#define POSL(x,v) (lower_bound(x.begin(),x.end(),v)-x.begin())
#define POSU(x,v) (upper_bound(x.begin(),x.end(),v)-x.begin())
int n,h[100005];
ll dp[100005];
/*
bool compare_by_b(pair<int, int> a, pair<int, int> b) {
    if(a. != b.second){
        return a.second < b.second;
    }else{
        return a.first < b.first;
    }
}
*/
int main(){


	long long N;
    std::cin >> N;
    stack<int> s;   
    queue<int> que;
    
    std::vector<long long> b(N);

    // 入力
    for(long long i=0; i<N; i++){
        cin >> b[i];
    	
    	if(b[i]>i+1){
			printf("-1");
			return 0;
		}
		
		if(i==0 && N==1){
			printf("%d\n",b[i]);
			return 0;
		}
			
		}
		if(b[i]==i+1){
			s.push(b[i]);
			continue;
		}
		if(b[i]!=0 && b[i]>b[i-1]){
			printf("%d\n",b[i]);
		}
		else if(b[i]!=0 && b[i]==b[i-1]){
			s.push(b[i]);
		}
		else{
			que.push(b[i]);
		}	
    }
    while(! que.empty()){
		printf("%d\n",que.front());
		que.pop();
	}
	while(! s.empty()){
		printf("%d\n",s.top());
		s.pop();
	}
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:61:22: error: 'i' was not declared in this scope
   61 |                 if(b[i]==i+1){
      |                      ^
a.cc:63:25: error: continue statement not within a loop
   63 |                         continue;
      |                         ^~~~~~~~
a.cc:65:22: error: 'i' was not declared in this scope
   65 |                 if(b[i]!=0 && b[i]>b[i-1]){
      |                      ^
a.cc: At global scope:
a.cc:75:5: error: expected unqualified-id before 'while'
   75 |     while(! que.empty()){
      |     ^~~~~
a.cc:79:9: error: expected unqualified-id before 'while'
   79 |         while(! s.empty()){
      |         ^~~~~
a.cc:84:1: error: expected declaration before '}' token
   84 | }
      | ^
Language: C++

#include<cmath>
#include<bits/stdc++.h>
#define MAX(a,b) (a>b? a:b)
#define MIN(a,b) (a>b? b:a)
#define rep(i,n) for(lint i=0;i<(lint)(n);i++) #define repr(i,n) for(lint i=(lint)(n);i>0;--i) #define reps(i,a,b) for(lint i=a;i<=(lint)(b);i++) typedef long long lint;
typedef long double ld;
using namespace std;
const ld PI = acos(-1.0);
int main(){
  lint N;
  cin >> N;
  vector<lint> b(N);
  rep(i,N) cin >> b[i];
  sort(b.begin(),b.end());
  rep(i,N) if(b[i]>=i+1) {
    cout << -1 << endl;
    return 0;
  }
  rep(i,N) cout << b[i] << endl;
  return 0;
}


Compiler output:
a.cc:5:16: error: '#' is not followed by a macro parameter
    5 | #define rep(i,n) for(lint i=0;i<(lint)(n);i++) #define repr(i,n) for(lint i=(lint)(n);i>0;--i) #define reps(i,a,b) for(lint i=a;i<=(lint)(b);i++) typedef long long lint;
      |                ^
a.cc: In function 'int main()':
a.cc:10:3: error: 'lint' was not declared in this scope; did you mean 'uint'?
   10 |   lint N;
      |   ^~~~
      |   uint
a.cc:11:10: error: 'N' was not declared in this scope
   11 |   cin >> N;
      |          ^
a.cc:12:14: error: template argument 2 is invalid
   12 |   vector<lint> b(N);
      |              ^
a.cc:13:7: error: 'i' was not declared in this scope
   13 |   rep(i,N) cin >> b[i];
      |       ^
a.cc:13:3: error: 'rep' was not declared in this scope
   13 |   rep(i,N) cin >> b[i];
      |   ^~~
a.cc:14:10: error: request for member 'begin' in 'b', which is of non-class type 'int'
   14 |   sort(b.begin(),b.end());
      |          ^~~~~
a.cc:14:20: error: request for member 'end' in 'b', which is of non-class type 'int'
   14 |   sort(b.begin(),b.end());
      |                    ^~~
Language: C++

#include<iostream>
#include<sstream>
#include<vector>
#include<iterator>
#include<stack>
using namespace std;

int main(void)
{
	int N;
	cin >> N;

	vector<int> b(N);
	for (int i = 0; i < N; i++)
		cin >> b[i];

	for (int i = 0; i < N; i++) {
		if (b[i] > i + 1) {
			cout << -1 << endl;
			return 0;
		}
	}

	vector<int> ans;
	stack<int> task;
	for (int i = 0; i < N;) {
		if (task.empty())
			task.push(b[i]);
		else {
			int n = task.top();
			if (b[i] < n) {
				ans.push_back(n);
				task.pop();
				continue;
			}
			else if (b[i] == n)
				ans.push_back(b[i]);
			else {
				task.push(b[i]);
			}
		}

		i++;
	}
	while (task.empty() != true) {
		ans.push_back(task.top());
		task.pop();
	}

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

	for (int i = 0; i < N; i++)
		cout << ans[i] << endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:50:9: error: 'reverse' was not declared in this scope
   50 |         reverse(ans.begin(), ans.end());
      |         ^~~~~~~
Language: C

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

int main()
{
	int N, b[100];
	int i;
	scanf("%d", &N);
	for (i = 0;i < N;i++)scanf("%d", &b[i]);

	int i_pos[100];
	int j = 0;

	for (i = 0;i < n;i++)
	{
		if (b[i] > i)
		{
			printf("-1\n");
			return 1;
		}
		if (b[i] == 1)
		{
			i_pos[j]= i;
			j++;
		}
	}
	for ()
	{
		printf("%c\n", b[i]);
	}

	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:15:24: error: 'n' undeclared (first use in this function)
   15 |         for (i = 0;i < n;i++)
      |                        ^
main.c:15:24: note: each undeclared identifier is reported only once for each function it appears in
main.c:28:14: error: expected expression before ')' token
   28 |         for ()
      |              ^
main.c:28:14: error: expected expression before ')' token
Language: C++

#include<stdio.h>

int main(){
    int words,i,s;
    int z;
    scanf("%d\n",&words);
i=words;
s=i;
int b[i];
for(words;words!=0;words--){
scanf("%d ",&z);
b[i-words]=z;
}
int a[i];//
int p[i+1];//
for(int j=0;j!=i+1;j++){
a[j]=0;
}
int q=0;
int x;
for(j;j!=-1;j--){
a[i-j]=b[i-j];
x=i-j;
while(q=0){
if(a[x]!=0){
p[x+1]=a[x];
if(a[x+1]!=0){
goto wow;
}
a[x+1]=p[x+1];
wow:
x++;
}else{
    q=1;
}
}
for(i;i!=0;i--){
    printf("%d",a[s-i]);
}
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:5: error: 'j' was not declared in this scope
   21 | for(j;j!=-1;j--){
      |     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define ALL(x) x.begin(),x.end()
//map<key,value>

int main(){
  int n;
  cin >> n;
  vector<int>b(n);
  vector<int>ans;
  for(int i=0;i<n;i++)cin >> b[i];
  else if(n>3){
  while(b.size()>1){
    for(int i=0;i<b.size()-1;i++){
      if(b[i]<=i+1 && b[i+1]<=i+1 && b.size()>2){
        ans.push_back(b[i]);
        b.erase(b.begin()+i);
        goto buck;
      }
      if(b.size()<=2){
        if(b[1]==2){
          ans.push_back(b[1]);
          b.erase(b.begin()+1);
        }
        goto buck;
      }
    }
    cout << "-1";return 0;
    buck:;
  }
}
else{
  while(b.size()>1){
    for(int i=0;i<b.size()-1;i++){
      if(b[i]<=i+1 && b[i+1]<=i+1){
        ans.push_back(b[i]);
        b.erase(b.begin()+i);
        goto buck2;
      }

    }
    cout << "-1";return 0;
    buck2:;
  }
}
  cout << "1" << "\n";
    for(int i=ans.size()-1;i>=0;i--)cout << ans[i] << "\n";
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'else' without a previous 'if'
   12 |   else if(n>3){
      |   ^~~~
Language: C++

#include<stdio.h>

int main(){
    int words,i,s;
    scanf("%d",&words);
i=words;
s=i;
int j=i;
int b[i];
for(words;words!=-1;words--){
scanf("%d",&a);
b[i-words]=a;
}
int a[i];//
int p[i+1];//
for(int j=0;j!=i+1;j++){
a[j]=0;
}
int q=0;
int x;
for(j;j!=-1;j--){
a[i-j]=b[i-j];
x=i-j;
while(q=0){
if(a[x]!=0){
p[x+1]=a[x];
if(a[x+1]!=0){
goto wow;
}
a[x+1]=p[x+1];
wow:
x++;
}else{
    q=1;
}
}
for(i;i!=0;i--){
    printf("%d",a[s-i]);
}
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'a' was not declared in this scope
   11 | scanf("%d",&a);
      |             ^
Language: C++

#include<stdio.h>

int main(){
    int words,i,s;
    scanf("%d",&words);
i=words;
s=i;
int j=i;
int b[i];
for(words;words!=-1;words--){
scanf("%d",&a);
b[i-words]=a;
}
int a[i];//
int p[i+1];//
for(int j=0;j!=i+1;j++){
a[j]=0;
}
int q=0;
int x;
for(j;j!=-1;j--){
a[i-j]=b[i-j];
x=i-j;
while(q=0){
if(a[x]!=0){
p[x+1]=a[x];
if(a[x+1]!=0){
goto wow:
}
a[x+1]=p[x+1];
wow:
x++;
}else{
    q=1;
}
}
for(i;i!=0;i--){
    printf("%d",a[s-i]);
}
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'a' was not declared in this scope
   11 | scanf("%d",&a);
      |             ^
a.cc:28:9: error: expected ';' before ':' token
   28 | goto wow:
      |         ^
      |         ;
a.cc:28:9: error: expected primary-expression before ':' token
Language: C++

#include<stdio.h>

int main(){
    int words,i,s;
    scanf("%d",&words);
i=words;
s=i;
int b[i];
for(words;words!=-1;words--){
scanf("%d",&a);
b[i-words]=a;
}
int a[i];//
int p[i+1];//
for(int j=0;j!=i+1;j++){
a[j]=0;
}
int q=0;
int x;
for(j;j!=-1;j--){
a[i-j]=b[i-j];
x=i-j;
while(q=0){
if(a[x]!=0){
p[x+1]=a[x];
if(a[x+1]!=0){
goto wow:
}
a[x+1]=p[x+1];
wow:
x++;
}else{
    q=1;
}
}
for(i;i!=0;i--){
    printf("%d",a[s-i]);
}
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:13: error: 'a' was not declared in this scope
   10 | scanf("%d",&a);
      |             ^
a.cc:20:5: error: 'j' was not declared in this scope
   20 | for(j;j!=-1;j--){
      |     ^
a.cc:27:9: error: expected ';' before ':' token
   27 | goto wow:
      |         ^
      |         ;
a.cc:27:9: error: expected primary-expression before ':' token
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> b(N),c(N);
  for<int i=0;i<N;i++){
    cin >> b.at(i);
  }
  bool Judge = false;
  for(int i=0;i<N;i++){
    if(b.at(i) < i){
      Judge = true;
      break;
    }
  }
  if(Judge) cout << "-1" << endl;
  else{
    for(int i=1;i<=N;i++){
      if(b.at(N - i) == 1 || b.at(N - i) == 2){
        c.at(i) = i + 1;
      }
      else{
        c.at(i) = b.at(N - i) + i + 1;
      }
    }
    for(int i=0;i<N;i++){
      for(int j=0;j<i;j++){
        if(c.at(i) == c.at(j)){
          Judge = true;
          break;
        }
        if(Judge){
          break;
        }
      }
    }
  }
      if(!Judge){
        for(int i=0;i<N;i++) cout << c.at(i) <<endl;
      }
      else cout << "-1" <<endl;
}
//自分でも何かいたかよくわからない
      

Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: expected '(' before '<' token
    7 |   for<int i=0;i<N;i++){
      |      ^
      |      (
a.cc:7:6: error: expected primary-expression before '<' token
a.cc:7:7: error: expected primary-expression before 'int'
    7 |   for<int i=0;i<N;i++){
      |       ^~~
a.cc:7:15: error: 'i' was not declared in this scope
    7 |   for<int i=0;i<N;i++){
      |               ^
Language: C++

#include<bits/std++.h>
using namespace std;
int main()
{
  int n,i.tmp;
  cin>>n;
  int a[n];
  priority_queue <int> q;
  for(i=0;i<n;i++) 
  {
    cin>>a[i];
    if(a[i]==1) q.push(i);
  }
  tmp=n;
  while(!q.empty())
  {
    sort(a+q.top(),a+tmp);
    for(int j=q.top();j<tmp;j++) cout<<a[j]<<endl;
    tmp=q.top();
    q.pop();
  }
 
  return 0;
}

Compiler output:
a.cc:1:9: fatal error: bits/std++.h: No such file or directory
    1 | #include<bits/std++.h>
      |         ^~~~~~~~~~~~~~
compilation terminated.
Language: Java

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

public class LimitedInsertion {
    static List<Integer> a = new ArrayList<Integer>();
    public static void main(String[] args) {
        Scanner scn = new Scanner(System.in);
        int N = scn.nextInt();
        List<Integer> b = new ArrayList<Integer>();
        // a.add(0, 1);
        for(int i=0; i<N; i++) {
            b.add(scn.nextInt());
        }
        for(int i=1; i<N+1; i++) {
            // if(a.get(a.size() - 1) < b.get(b.size() - 1)) {
            //     a_insert(b.get(b.size() - 1));

            // }
            boolean is_clear = a_insert(b.get(0));
            if(!is_clear) {
                System.out.println("-1");
                break;
            }
        }
        for(int i=0; i<a.size(); i++) {
            System.out.println(a.get(i));
        }
        
    }
    public static boolean a_insert(Integer element){
        try {
            a.add(element-1, element); //(index, element)
            return true;
        } catch (Exception e) {
            return false;
        }
    }
}

Compiler output:
Main.java:5: error: class LimitedInsertion is public, should be declared in a file named LimitedInsertion.java
public class LimitedInsertion {
       ^
1 error
Language: Java

import java.util.ArrayDeque;
import java.util.LinkedList;
import java.util.Scanner;
import java.util.Stack;

class Task {
    LinkedList<Integer> list;
    ArrayDeque<Integer> process;

    Task(LinkedList<Integer> list, ArrayDeque<Integer> process) {
        this.list = list;
        this.process = process;
    }
}

class Main2 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
 
        int n = sc.nextInt();
        LinkedList<Integer> b = new LinkedList<>();
        for(int i = 0; i < n; i++) {
            b.add(sc.nextInt());
        }

        ArrayDeque<Integer> ans = null;
        Stack<Task> stack = new Stack<>();
        stack.add(new Task(b, new ArrayDeque<Integer>()));
        while(!stack.isEmpty()) {
            Task task = stack.pop();
            LinkedList<Integer> tmp = task.list;
            ArrayDeque<Integer> tmpprocess = task.process;

            if(tmp.size() == 0) {
                ans = tmpprocess;
                break;
            }

            for(int i = 0; i < tmp.size(); i++) {
                if(tmp.get(i) == i + 1) {
                    LinkedList<Integer> list = (LinkedList<Integer>)tmp.clone();
                    list.remove(i);
                    ArrayDeque<Integer> process = (ArrayDeque<Integer>)tmpprocess.clone();
                    process.addFirst(i + 1);
                    stack.add(new Task(list, process));
                }
            }
        }

        if(ans == null) {
            System.out.println(-1);
        }else {
            for(int x : ans) {
                System.out.println(x);
            }
        }
 
        sc.close();
    }
}

Compiler output:
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Language: C++

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

vector<int> make_A()

int main() {
    int N; cin >> N;
    vector<int> B; 
    for (int i=0;i<N;i++) cin >> B[i];
    vector<int> A;
    bool ans=false;
    for (int i=0;i<N;i++){
        for (int j=0;j<i;j++){
            A.insert(A.begin() + j, j+1);
            break;
        }
    }
    if (A==B) {
        for (int i=0;i<N;i++){}
    }
}

Compiler output:
a.cc:9:1: error: expected initializer before 'int'
    9 | int main() {
      | ^~~
Language: C++

#include "pch.h" 
#include <iostream>
#include <string>
#include <string.h>
#include <algorithm>
#include <stack>
#include <queue>
#include <set>
#include <map>
#include <cmath>
#include <stdio.h>
#include <vector>
#include <time.h>
#include <iomanip>
#include <thread>
#include <atomic>
#include <mutex>
#include <future>
#define double long double
#define int long long
#define low lower_bound
#define upp upper_bound
#define mod 1000000007 //10^9+7
#define inf 10000000000000000 //10^16
#define rep(i,n) for(int i=0;i<n;i++)
#define all(vec) vec.begin(),vec.end()
#define vsort(vec) sort(all(vec))
#define vrever(vec) reverse(all(vec));
#define vunsort(vec) vsort(vec); vrever(vec);
#define bisea binary_search
using namespace std;
int n;
vector<int>b;
signed main() {
	cin >> n;
	bool can = true;
	rep(i, n) {
		int a;
		cin >> a;
		b.push_back(a);
		if (i + 1 < b[i]) {
			can = false;
		}
	}
	if (!can) {
		cout << -1 << endl;
	}
	else {
		vector<int>ans;
		while(1<b.size()) {
			bool can = false;
			for (int i = b.size() - 1; i >= 0; i--) {
				if (i + 1 <= b[i]) {
					can = true;
					ans.push_back(b[i]);
					b.erase(b.begin() + i);
					break;
				}
			}
			if (!can) {
				ans.push_back(b[1]);
				b.erase(b.begin() + 1);
			}
			/*for (int i: b) {
				cout << i << " ";
			}
			cout << endl;*/
		}
		ans.push_back(1);
		vrever(ans);
		rep(i, n) {
			cout << ans[i] << endl;
		}
	}
}

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

using namespace std;

int main(){
  int N;
  cin>>N;
  vector<int> a(N);
  for(int i=0;i<N;i++){
    cin>>a.at(i);
    if(a.at(i) > i+1){
      cout << -1 << endl;
      return 0;
    }
  }
  
  int ans[N];
  
  for(int i=N-1;i>=0;i--){
    for(int j=i;j>=0;j--){
      if( a.at(j) ==  j+1){
        ans[i] = j+1;
        a.erase( a.begin()+j);
        break;
      }
    }
  }
  
  for(int i=0;i<N;i++){
    cout<<ans[i]<<endl;
  }
}
        

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   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:6:3: error: 'vector' was not declared in this scope
    6 |   vector<int> a(N);
      |   ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | using namespace std;
a.cc:6:10: error: expected primary-expression before 'int'
    6 |   vector<int> a(N);
      |          ^~~
a.cc:8:10: error: 'a' was not declared in this scope
    8 |     cin>>a.at(i);
      |          ^
a.cc:10:7: error: 'cout' was not declared in this scope
   10 |       cout << -1 << endl;
      |       ^~~~
a.cc:10:7: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:21: error: 'endl' was not declared in this scope
   10 |       cout << -1 << 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;
a.cc:19:11: error: 'a' was not declared in this scope
   19 |       if( a.at(j) ==  j+1){
      |           ^
a.cc:28:5: error: 'cout' was not declared in this scope
   28 |     cout<<ans[i]<<endl;
      |     ^~~~
a.cc:28:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:28:19: error: 'endl' was not declared in this scope
   28 |     cout<<ans[i]<<endl;
      |                   ^~~~
a.cc:28:19: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: C++

#include<stdio.h>

int main(){
    int words,i,a,s;
    scanf("%d",&words);
i=words;
s=i;
int j[i];
for(words;words!=0;words--;){
scanf("%d",&a);
j[i-words]=a;
}
for(i; i!=0;i--;){
printf("%d",j[s-i]);
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:27: error: expected ')' before ';' token
    9 | for(words;words!=0;words--;){
      |    ~                      ^
      |                           )
a.cc:9:28: error: expected primary-expression before ')' token
    9 | for(words;words!=0;words--;){
      |                            ^
a.cc:13:16: error: expected ')' before ';' token
   13 | for(i; i!=0;i--;){
      |    ~           ^
      |                )
a.cc:13:17: error: expected primary-expression before ')' token
   13 | for(i; i!=0;i--;){
      |                 ^
Language: C++

#include<stdio.h>

int main(){
    int words,i,a,s;
    scanf("%d",&words);
i=words;
s=i;
int j[i];
for(words;words!=0;words--){
scanf("%d",&a);
j[i-words]=a;
}
for(i; i!=0;i==){
printf("%d",j[s-i]);
}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: expected primary-expression before ')' token
   13 | for(i; i!=0;i==){
      |                ^
Language: Java

import java.util.Scanner;
public class Main{
  public static void main(String[] args){
 	Scanner sc = new Scanner(Syste.in);
    int a = nextInt();
  }
}

Compiler output:
Main.java:4: error: cannot find symbol
 	Scanner sc = new Scanner(Syste.in);
 	                         ^
  symbol:   variable Syste
  location: class Main
Main.java:5: error: cannot find symbol
    int a = nextInt();
            ^
  symbol:   method nextInt()
  location: class Main
2 errors
Language: C++

#include<stdio.h>

int main(){
    int words,i,a,s;
    scanf("%d",&words);
i=words;
s=i;
int j[i];
for(words;words!=0;words--;){
scanf("%d",&a);
j[i-words]=a;
}
for(i; i!=0;i==;){
printf("%d",j[s-i]);
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:27: error: expected ')' before ';' token
    9 | for(words;words!=0;words--;){
      |    ~                      ^
      |                           )
a.cc:9:28: error: expected primary-expression before ')' token
    9 | for(words;words!=0;words--;){
      |                            ^
a.cc:13:16: error: expected primary-expression before ';' token
   13 | for(i; i!=0;i==;){
      |                ^
a.cc:13:16: error: expected ')' before ';' token
   13 | for(i; i!=0;i==;){
      |    ~           ^
      |                )
a.cc:13:17: error: expected primary-expression before ')' token
   13 | for(i; i!=0;i==;){
      |                 ^
Language: C++

#include<stdio.h>

int main(){
    int words,i,a,s;
    scanf("%d",&words);
i=words;
s=i;
int j[i];
for(words;words!=0;words--;){
scanf("%d",&a)
j[i-words]=a;
}
for(i; i!=0;i==;){
printf("%d",j[s-i]);
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:27: error: expected ')' before ';' token
    9 | for(words;words!=0;words--;){
      |    ~                      ^
      |                           )
a.cc:9:28: error: expected primary-expression before ')' token
    9 | for(words;words!=0;words--;){
      |                            ^
a.cc:13:16: error: expected primary-expression before ';' token
   13 | for(i; i!=0;i==;){
      |                ^
a.cc:13:16: error: expected ')' before ';' token
   13 | for(i; i!=0;i==;){
      |    ~           ^
      |                )
a.cc:13:17: error: expected primary-expression before ')' token
   13 | for(i; i!=0;i==;){
      |                 ^
Language: C

#include <stdio.h>
int main(){
	int i,j,n,b[101];
	scanf ("%d",&n);
	for (i=0;i<n;i++){
		scanf ("%d",&b[i]);
		}
	for (i){
		for (){
			
			}
		}
	return 0;
	}

Compiler output:
main.c: In function 'main':
main.c:8:15: error: expected ';' before ')' token
    8 |         for (i){
      |               ^
      |               ;
main.c:8:15: error: expected expression before ')' token
main.c:9:22: error: expected expression before ')' token
    9 |                 for (){
      |                      ^
main.c:9:22: error: expected expression before ')' token
Language: Java

import java.util.*;

public class main {
	public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		String N = sc.nextLine();
		int n = Integer.valueOf(N);
		int[] B= new int[n];
		for(int i=0;i<n;i++){
			String a = sc.nextLine();
			int b = Integer.valueOf(a);
			if(b<=i){
				System.out.println(-1);
				break;
			}
				for (int ic = n;ic>b;ic--){
					B[ic] =B[ic-1];
				}
				B[b] = b;
		}
		for (int iz=0;iz<n;iz++){
			System.out.println(B[iz]);
		}


	}
}


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

import java.util.*;

public class main {
	public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		String N = sc.nextLine();
		int n = Integer.valueOf(N);
		int[] B= new int[n];
		for(int i=0;i<n;i++){
			String a = sc.nextLine();
			int b = Integer.valueOf(a);
			if(b<i){
				System.out.println(-1);
				break;
			}
				for (int ic = n;ic>b;ic--){
					B[ic] =B[ic-1];
				}
				B[b] = b;
		}
		for (int iz=0;iz<n;iz++){
			System.out.println(B[iz]);
		}


	}
}


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

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

int main() {
    int N;
    cin >> N;
    vector<int> B(N);
    for (int i = 0; i < N; i++) cin >> B[i];
    vector<int> ans;
    for (int i = 0; i < N; i++) {
        for (int j = B.size() - 1; j >= 0; j--) {
            if (B[j] == j + 1) {
                ans.push_back(B[j]);
                B.erase(B.begin() + j);
                break;
            }
        }
    }
    if (ans.size() != N) {
        cout << -1 << endl;
        return 0;
    }
    reverse(ans.begin(), ans.end());
    for (int i = 0; i < N; i++) {
        cout << ans[i] << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:5: error: 'reverse' was not declared in this scope
   24 |     reverse(ans.begin(), ans.end());
      |     ^~~~~~~
Language: Java

import java.util.*;

public class Main {
	public static void main(String... args){
		Scanner sc = new Scanner(System.in);
		String N = sc.nextLine();
		int n = Integer.valueOf(N);
		int[] B= new int[n];
		for(int i=0;i<n;i++){
			String a = sc.nextLine();
			int b = Integer.valueOf(a);
			if(b<i){
				System.out.prinltln(-1);
				break;
			}
				for (i = n+1;i>b;i--){
					B[i] =B[i-1];
				}
				B[b] = b;
		}
		for (i=0;i<n;i++){
			System.out.println(B[i]);
		}


	}
}


Compiler output:
Main.java:13: error: cannot find symbol
				System.out.prinltln(-1);
				          ^
  symbol:   method prinltln(int)
  location: variable out of type PrintStream
Main.java:21: error: cannot find symbol
		for (i=0;i<n;i++){
		     ^
  symbol:   variable i
  location: class Main
Main.java:21: error: cannot find symbol
		for (i=0;i<n;i++){
		         ^
  symbol:   variable i
  location: class Main
Main.java:21: error: cannot find symbol
		for (i=0;i<n;i++){
		             ^
  symbol:   variable i
  location: class Main
Main.java:22: error: cannot find symbol
			System.out.println(B[i]);
			                     ^
  symbol:   variable i
  location: class Main
5 errors
Language: Java

import java.util.Scanner;
public class Main{
  public static void main(String[] args){
 	Scanner sc = new Scanner(Syste.in);
    int a = nextInt();
    int b = nextInt(a);
  }
}

Compiler output:
Main.java:4: error: cannot find symbol
 	Scanner sc = new Scanner(Syste.in);
 	                         ^
  symbol:   variable Syste
  location: class Main
Main.java:5: error: cannot find symbol
    int a = nextInt();
            ^
  symbol:   method nextInt()
  location: class Main
Main.java:6: error: cannot find symbol
    int b = nextInt(a);
            ^
  symbol:   method nextInt(int)
  location: class Main
3 errors
Language: Java

import java.util.Scanner;
public class Main{
  public static void main(String[] args){
 	Scanner sc = new.Scanner(Syste.in);
    int a = nextInt();
    int b = nextInt();
  }
}

Compiler output:
Main.java:4: error: <identifier> expected
 	Scanner sc = new.Scanner(Syste.in);
 	                ^
1 error
Language: C++

#include <bits/stdc++.h>
#ifdef _WIN32
#include "debug.hpp"
#endif
using namespace std;

#define rep(i, N)  for(int i = 0; i < (N); i++)
#define reps(i, N) for(int i = 1; i <= (N); i++)
#define repr(i, N) for(int i = (N) - 1; i >= 0; i--)
#define pub push_back

template<typename T> 
void chmax(T &a, T b){ a = max(a, b); };
template<typename T> 
void chmin(T &a, T b){ a = min(a, b); };

typedef long long ll;
typedef pair<int, int> P;
const int INF = 100000000;
const ll LINF = 10000000000000000;
const int MOD = 1000000007;
const int dx[9] = { 0, 1,  0, -1, 1,  1, -1, -1, 0};
const int dy[9] = { 1, 0, -1,  0, 1, -1, -1,  1, 0};
//--------------------------------------//
int N;
int b[100];

bool a[100];
int d[100];

void update(){
	d[0] = 1;
	rep(i, N - 1){
		d[i + 1] = d[i] + a[i];
	}
}
void solve(){
	rep(i, N){
		if(i + 1 < b[i]){
			cout << -1 << endl;
			return;
		}
	}
	rep(i, N) d[i] = 1;
	int n = N;
	repr(i, N){
		if(!a[i] and d[i] == b[i]){
			cout << b[i] << endl;
			a[i] = true;
			update();
			n--;
			if(n == 0) break;
			i = N;
		}
	}
}


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++

#include<bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#define ll long long
#define pi pair<ll,ll>
#define mp make_pair
#define srtin1 cin.ignore ( std::numeric_limits<std::streamsize>::max(), '\n' );
#define strin2 getline(cin, text);
#define fi first
#define se second
#define pb push_back
#define mod (ll)1000000007
#define sp ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL)
#define mxn 311111
#define mxn2 1111111
#define test cout<<"vaibhav";
#define dd double
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
using namespace std;
using namespace __gnu_pbds;
int main(){
    int n;
    cin >> n;
    int b[n+1];
    for(int i=1; i<=n; ++i)cin >> a[i];
    for(int i=1; i<=n; ++i){
        if(b[i]>i){
            cout << -1 << endl;
            return 0;
        }
    }
    for(int i=1; i<=n; ++i)cout << b[i] << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:27:35: error: 'a' was not declared in this scope
   27 |     for(int i=1; i<=n; ++i)cin >> a[i];
      |                                   ^
Language: Java

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

public class A {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int[] count = new int[n];
        List<Integer> a = new ArrayList<>();
        int[] b = new int[n];
        for (int i = 0; i < n; i++) {
            b[i] = sc.nextInt();
        }
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < n; j++) {
                if (b[j] == i+1) {
                    if (a.size() >= i) {
                        a.add(i, i+1);
                        System.out.println(i+1);
                    } else {
                        System.out.println(-1);
                        return;
                    }
                }
            }
        }
    }
}


Compiler output:
Main.java:5: error: class A is public, should be declared in a file named A.java
public class A {
       ^
1 error
Language: C++

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

int main(){
    int n, i, b;
    cin >> n;
    int b[n];
    for(i=1; i<=n; i++){
        cin >> b[i];
        if(b[i-1] > i){
            break;
        }
    }
    if(i == n){
        for(i=0; i<n; i++){
            cout << b[i] << '\n';
        }
    }else{
        cout << -1;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: conflicting declaration 'int b [n]'
    7 |     int b[n];
      |         ^
a.cc:5:15: note: previous declaration as 'int b'
    5 |     int n, i, b;
      |               ^
a.cc:9:17: error: invalid types 'int[int]' for array subscript
    9 |         cin >> b[i];
      |                 ^
a.cc:10:13: error: invalid types 'int[int]' for array subscript
   10 |         if(b[i-1] > i){
      |             ^
a.cc:16:22: error: invalid types 'int[int]' for array subscript
   16 |             cout << b[i] << '\n';
      |                      ^
Language: C++

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

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

    int n; cin >> n;
    vector<int> a, b;

    for(int i = 1; i < n; ++i){
        for(int j = i+1; j <= n; ++j){
            if((n%2 == 1 && i+j != n) || (n%2 == 0 && i+j != n+1)){
                a.push_back(i);
                b.push_back(j);
            }
        }
    }

    cout << a.size() << "\n";
    rep(i,m) cout << a[i] << " " << b[i] << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:11: error: 'm' was not declared in this scope
   24 |     rep(i,m) cout << a[i] << " " << b[i] << "\n";
      |           ^
a.cc:5:37: note: in definition of macro 'rep'
    5 | #define rep(i,n) for(int i = 0; i < n; ++i)
      |                                     ^
Language: C++

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

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

    int n; cin >> n;
    vector<int> a, b;
    
    for(int i = 1; i < n; ++i){
        for(int j = i+1; j <= n; ++j){
            if((n%2 == 1 && i+j != n) || (n%2 == 0 && i+k != n+1)){
                a.push_back(i);
                b.push_back(j);
            }
        }
    }

    cout << a.size() << "\n";
    rep(i,m) cout << a[i] << " " << b[i] << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:57: error: 'k' was not declared in this scope
   16 |             if((n%2 == 1 && i+j != n) || (n%2 == 0 && i+k != n+1)){
      |                                                         ^
a.cc:24:11: error: 'm' was not declared in this scope
   24 |     rep(i,m) cout << a[i] << " " << b[i] << "\n";
      |           ^
a.cc:5:37: note: in definition of macro 'rep'
    5 | #define rep(i,n) for(int i = 0; i < n; ++i)
      |                                     ^
Language: C++

#include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#include <algorithm>
using namespace std;
using ll = long long;
using P = pair<int,int>;
using Graph= vector<vector<int>>; 
#define rep(i,n) for (ll i=0; i < (n); ++i)
#define rep2(i,n,m) for(ll i=n;i<=m;i++)
#define rep3(i,n,m) for(ll i=n;i>=m;i--)
#define pb push_back
#define eb emplace_back
#define ppb pop_back
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
int main(){
  int n ;
  cin>> n ;
  if(n%2==1){
    int m=(n-1)*(n-1)/2 ;
    cout<< m<<endl ;
  rep2(i,1,n-1){
    rep2(j,i+1,n){
      if(i+j!=n)
      cout <<i<<" " <<j<< endl ;
    }
  }
  }
   else{
     int m=(n-2)*(n-1)/2;
    cout <<m<<endl ;
    rep2(j,i+1,n-1){
    if(i+j!=n+1)
     cout <<i<<" "<<j<<endl ;
        }
    }
    return 0;
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:34:12: error: 'i' was not declared in this scope
   34 |     rep2(j,i+1,n-1){
      |            ^
a.cc:10:30: note: in definition of macro 'rep2'
   10 | #define rep2(i,n,m) for(ll i=n;i<=m;i++)
      |                              ^
Language: C++

#include <bits/stdc++.h>
#include <cstdlib>
#include <cmath>
#include <algorithm>
using namespace std;
using ll = long long;
using P = pair<int,int>;
using Graph= vector<vector<int>>; 
#define rep(i,n) for (ll i=0; i < (n); ++i)
#define rep2(i,n,m) for(ll i=n;i<=m;i++)
#define rep3(i,n,m) for(ll i=n;i>=m;i--)
#define pb push_back
#define eb emplace_back
#define ppb pop_back
const ll INF=1e18 ;
inline void chmax(ll& a,ll b){a=max(a,b);}
inline void chmin(ll& a,ll b){a=min(a,b);}
int main(){
  int n ;
  cin>> n ;
  if(n%2==1){
    int m=(n-1)*(n-1)/2 ;
    cout<< m<<endl ;
  rep2(i,1,n-1){
    rep2(j,i+1,n){
      if(i+j!=n)
      cout <<i<<" " <<j<< endl ;
    }
  }
  }
   else{
     int m=(n-2)*(n-1)/2;
    cout <<m<<endl ;
    rep2(i,i,n-1){
    if(i+j!=n+1)
     cout <<i<<" "<<j<<endl ;
        }
    }
    return 0;
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:35:10: error: 'j' was not declared in this scope
   35 |     if(i+j!=n+1)
      |          ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  cout << N * (N-1) / 2 - N / 2; << endl;
  for (int i=1; i<=N-1 ;i++) {
    for (int j=i+1; j<=N; j++) {
      if (i+j != N + (N+1) % 2) {
        cout << i << " " << j << endl;
      }
    }
  }
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:34: error: expected primary-expression before '<<' token
    7 |   cout << N * (N-1) / 2 - N / 2; << endl;
      |                                  ^~
Language: C++

#include <iostream>
using namespace std;
int main(){
  int n;
  cin>>n;
  cout<<n*(n-1)/2-(n-1)/2<<endl;
  for(int i=1;i<=n;i++){
    for(int j=i+1;j<=n;j++){
      if(i+j==n){
        continue;
      }else{
        cout<<i<<" "<<j<<endl;
    }
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:2: error: expected '}' at end of input
   16 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pp pair<int,int>
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define ld long double
#define al(a) (a).begin(),(a).end()
#define mk make_pair
#define check cout<<"?"<<endl;

ll MOD=1000000007;
ll mod=998244353;
int inf=1000001000;
ll INF=1e18+5;

int main() {
    int n; cin>>n;
    if(n%2){
        for(int i=1;i<=n-2;i++){
            for(int j=i+1;j<=n-1;j++){
                if(i+j!=n) cout<<i<<" "<<j<<endl;
            }
        }
        for(int i=1;i<=n-1;i++)
        cout<<i<<" "<<n<<endl;
    }
    else{
        for(int i=1;i<=n-1;i++){
            for(int j=i+1;j<=n;j++){
                if(i+j!=n) cout<<i<<" "j<<endl;
            }
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:37: error: unable to find string literal operator 'operator""j' with 'const char [2]', 'long unsigned int' arguments
   31 |                 if(i+j!=n) cout<<i<<" "j<<endl;
      |                                     ^~~~
Language: C++

//#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
#define pp pair<int,int>
#define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
#define ld long double
#define al(a) (a).begin(),(a).end()
#define mk make_pair
#define check cout<<"?"<<endl;

ll MOD=1000000007;
ll mod=998244353;
int inf=1000001000;
ll INF=1e18+5;

int main() {
    int n; cin>>n;
    if(n%2){
        for(int i=1;i<=n-2;i++){
            for(int j=i+1;j<=n-1;j++){
                if(i+j!=n) cout<<i<<" "j<<endl;
            }
        }
        for(int i=1;i<=n-1;i++)
        cout<<i<<" "<<n<<endl;
    }
    else{
        for(int i=1;i<=n-1;i++){
            for(int j=i+1;j<=n;j++){
                if(i+j!=n) cout<<i<<" "j<<endl;
            }
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:37: error: unable to find string literal operator 'operator""j' with 'const char [2]', 'long unsigned int' arguments
   22 |                 if(i+j!=n) cout<<i<<" "j<<endl;
      |                                     ^~~~
a.cc:31:37: error: unable to find string literal operator 'operator""j' with 'const char [2]', 'long unsigned int' arguments
   31 |                 if(i+j!=n) cout<<i<<" "j<<endl;
      |                                     ^~~~
Language: C++


        for (int i = 1; i <= n; i++) {
            for (int j = i+1; j <= n; j++) {
                if (i+j==n+1) continue;
                cout << i << " " << j << "\n";
            }
        }

Compiler output:
a.cc:2:9: error: expected unqualified-id before 'for'
    2 |         for (int i = 1; i <= n; i++) {
      |         ^~~
a.cc:2:25: error: 'i' does not name a type
    2 |         for (int i = 1; i <= n; i++) {
      |                         ^
a.cc:2:33: error: 'i' does not name a type
    2 |         for (int i = 1; i <= n; i++) {
      |                                 ^
Language: C

#include<bits/stdc++.h>
#include<math.h>
#include<vector>
using namespace std;
#define MAX 25
#define MOD 1000000000
#define NINF -1000000000000000000
vector<int> Graph[MAX];
bool visit[MAX];
int sum[MAX];
bool makeGraph(int n)
{
    int arr[n+1];
    int sum[n+1];
    int i=0;
    arr[i]=0;
    sum[i]=0;
    int j;
    for(i=1,j=(n/2)*2;i<=n;i++,j--)
    {
        sum[i]=0;
        if(i<j)
        {
            arr[i]=j;
        }
        else
        {
            arr[i]=0;
        }
    }
    for(i=1;i<=n;i++)
    {
        for(j=i+1;j<=n;j++)
        {
            if(arr[i]==j) continue;
            sum[i]+=j;
            sum[j]+=i;
        }
    }
    for(i=2;i<=n;i++)
    {
        if(sum[i]!=sum[i-1]) return false;
    }
    printf("%d\n",n*(n-1)/2-(n/2));
    for(i=1;i<=n;i++)
    {
        for(j=i+1;j<=n;j++)
        {
            if(arr[i]==j) continue;
            printf("%d %d\n",i,j);
        }
    }
    return true;
}
int main()
{
    int n;
    scanf("%d",&n);
    bool ans=makeGraph(n);
    return 0;
}


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

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MOD = 1000000007;



int main(){
    ll N; cin >> N;
    
    vector<vector<int>> G(N+1, vector<int>(N+1));
    int p = 1, cnt = 0;
    if(N % 2 == 1) p = 0;
        
    for(int i = N; i > N/2+1; i--){
        for(int j = p+1; j < i; j++) {
            G[i][j] = 1;
            G[j][i] = 1;
            cnt++;
            if(p != 0){
                G[p][j] = 1;
                G[j][p] = 1;
                cnt++;
            }
        }
        p++;
    }
    cout << cnt << endl;
    for(int i = 1; i <= N-1; i++){
        for(int j = i+1; j <= N; j++){
            if(G[i][j] == 1) cout << i << " " << j << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:31:60: error: expected '}' at end of input
   31 |             if(G[i][j] == 1) cout << i << " " << j << endl;
      |                                                            ^
a.cc:30:38: note: to match this '{'
   30 |         for(int j = i+1; j <= N; j++){
      |                                      ^
a.cc:31:60: error: expected '}' at end of input
   31 |             if(G[i][j] == 1) cout << i << " " << j << endl;
      |                                                            ^
a.cc:29:34: note: to match this '{'
   29 |     for(int i = 1; i <= N-1; i++){
      |                                  ^
a.cc:31:60: error: expected '}' at end of input
   31 |             if(G[i][j] == 1) cout << i << " " << j << endl;
      |                                                            ^
a.cc:8:11: note: to match this '{'
    8 | int main(){
      |           ^