poj 1844 Sum

#include <iostream>#include <cstdio>#include <cstdlib>#include <cstring>using namespace std;int main(){int n;    scanf("%d", &n);    int sum =0;    int i =0;    while (sum < n || (sum - n) &1)    {        i++;        sum += i;    }    printf("%dn", i);    return 0;}