The program doesn't give any output on VS Code if I use 'const int ' and assign it a-CodePudding

#include <bits/stdc  .h>

using namespace std ;

int main () {
    int n ;
    cin >> n ;
    int a [n] ;

    for ( int i = 0 ; i < n ; i   ) {
        cin >> a [i] ;
    }

    const int N = 1e6   2 ; // This is where the problem is...
    bool check [N] ;
    for ( int i = 0 ; i < N ; i   ) {
        check [i] == 0 ;
    }

    for ( int i = 0 ; i < N ; i   ) {
        if ( a [i] >= 0 ) {
            check [a[i]] = 1 ;
        }
    }

    int ans = -1 ;
    for ( int i = 0 ; i < N ; i   ) {
        if ( check [i]==0 ) {
            ans = i ;
            break;
        }
    }

    cout << ans ;
    return 0 ;
}

When I run the above program in the VS Code terminal I get no output... :

PS C:\Users\LENOVO\Desktop\C   Programs> cd "c:\Users\LENOVO\Desktop\C   Programs\" ; if ($?) { g   smallest_positive_missing_number.cpp -o smallest_positive_missing_number } ; if ($?) { .\smallest_positive_missing_number }
6
0 -9 1 3 -4 5
PS C:\Users\LENOVO\Desktop\C   Programs>

CodePudding user response：

First, stop using VLA because it is NOT supported in c standard. Use vector or new instead.

int *a = new int[n];
bool *check = new bool[N];

And use them just like a normal array.
As for your problem, it is clearly caused by VLA with big size, and it will run perfectly once you switch to new or vector.