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#include<bits/stdc++.h>
using namespace std;
 
bool check(vector<vector<bool> >arr,int row,int col,int n)
{
    for(int i=0;i<row;i++)
    {
        if(arr[i][col])
        {
            return false;
        }
    }
    for(int j=0;j<col;j++)
    {
        if(arr[row][j])
        {
            return false;
        }
    }
 
    for(int i=row;int j=col;i>=0 && j>=0;i--,j--)
    {
        if(arr[i][j])
        {
            return false;
        }
    }
 
    for(int i=row;int j=col;i>=0 &&j<col;i--,j++)
    {
        if(arr[i][j])
        {
            return false;
        }
    }
    return true;
}
 
 
 
 
bool bck(vector< vector<bool> >arr,int n,int row)
{
    if(row<=N)
    {
     return true;
    }
 
 
    for(int i=0;i<n;i++)
    {
    if(check(arr,row,i,n))
    {
        arr[row][col] = true;
 
 
        if(bck(arr,n,row+1))
        {
            return true;
        }
    }
 
    }
    return false;   
}
 
 
 
int main()
{
   int n;
   cin>>n;
   vector< <vector<bool> >arr(n,vector<bool>(n));
   if(bck(arr,n,0)==true)
   {
       for(int i=0;i<n;i++)
       {
           for(int j=0;j<n;j++)
           {
               cout<<arr[i][j]<<" ";
           }
           cout<<endl;
       }
   }
    return 0;
}
 

prog.cpp: In function ‘bool check(std::vector<std::vector<bool> >, int, int, int)’:
prog.cpp:21:41: error: expected ‘)’ before ‘;’ token
     for(int i=row;int j=col;i>=0 && j>=0;i--,j--)
                                         ^
prog.cpp:21:42: error: ‘i’ was not declared in this scope
     for(int i=row;int j=col;i>=0 && j>=0;i--,j--)
                                          ^
prog.cpp:21:46: error: ‘j’ was not declared in this scope
     for(int i=row;int j=col;i>=0 && j>=0;i--,j--)
                                              ^
prog.cpp:29:41: error: expected ‘)’ before ‘;’ token
     for(int i=row;int j=col;i>=0 &&j<col;i--,j++)
                                         ^
prog.cpp: In function ‘bool bck(std::vector<std::vector<bool> >, int, int)’:
prog.cpp:44:13: error: ‘N’ was not declared in this scope
     if(row<=N)
             ^
prog.cpp:54:18: error: ‘col’ was not declared in this scope
         arr[row][col] = true;
                  ^~~
prog.cpp: In function ‘int main()’:
prog.cpp:73:48: error: template argument 1 is invalid
    vector< <vector<bool> >arr(n,vector<bool>(n));
                                                ^
prog.cpp:73:48: error: template argument 2 is invalid
prog.cpp:74:11: error: ‘arr’ was not declared in this scope
    if(bck(arr,n,0)==true)
           ^~~

Standard output is empty