#include <iostream> using namespace std; int sum(int a,int b){ int s=0; for(int i=a;i<=b;i++) s+=i; return s; } int main(){ cout<<sum(1,10)<<"\n"; //韘譨镾嫐藁 cout<<sum(20,35)<<"\n"; cout<<sum(35,45)<<"\n"; return 0; }