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