When I declare vector v[10] , inside the main() function like this,

#include<bits/stdc++.h>
int main()
{
    vector<int> v[10];
}

the program halts & stops responding.

But When I declare it at global, like this,

#include<bits/stdc++.h>
vector<int> v[10];
int main()
{
    //something
} 

It works fine.

Why ?