TOJ 2346.Gauß in Elementary School

题目链接

水题，求和即可

#include <stdio.h>int main(){    long long int m,n;    int num;    scanf("%d",&num);    for(int i=1;i<=num;i++)    {        scanf("%lld %lld",&n,&m);        printf("Scenario #%d:\n%lld\n\n",i,(n+m)*(m-n+1)/2);    }}