#include<iostream> using namespace std; int qiuhe(int x,int y){ int sum=0; for(int i=x;i<=y;i++){ sum+=i; } return sum; } int main(){ cout<<qiuhe(1,10)<<endl; cout<<qiuhe(20,30)<<endl; cout<<qiuhe(35,45)<<endl; return 0; }