HDU 2058 The Sum Problem

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

int n,m;

int main() {
    while(~scanf("%d%d", &n, &m)) {
            if( n == 0 && m == 0) break;
       for(int i = sqrt(2 * m); i >= 1; i --) {
            int a = (m - ((i - 1) * i) / 2) / i;
            if(m == a * i + (i * (i - 1)) / 2)
            cout<< ‘[‘ << a << ‘,‘ << a + i - 1 << ‘]‘ <<endl;
        }
        printf("\n");
    }
    return 0;
}