#include <bits/stdc++.h> using namespace std; int qiuhe(int a,int b){ int c=0; for(int i=a;i<=b;i++){ c+=i; } return c; } int main(){ cout<<qiuhe(1,10)<<endl; cout<<qiuhe(20,30)<<endl; cout<<qiuhe(35,45); return 0; }