代码为什么运行不了 ld returned 1 exit status

Question

代码为什么运行不了

[错误] ld returned 1 exit status

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

int mian()
{
    int t;
    cin>>t;
    
    while(t--)
    {
        long long n;
        cin>>n;
        
        long long sum=(1+n)*n/2;
        long long pow=1;
        while(pow<=n)
        {
            sum-=pow*2;
            pow*=2;
        }
        cout<<sum<<endl;
    }
    
    return 0;
}

Answer 1

main