Submission #1027014

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027014		HasanV11010238	Trol (COCI19_trol)	C++17	50 / 50	1 ms	348 KiB

trol

#include <bits/stdc++.h>
using namespace std;
#define ll long long
ll su(ll x){
	ll ret = 45 * (x / 9);
	ll val = x % 9;
	ret += val * (val + 1) / 2;
	return ret;
}
int main(){
	ll q, a, b;
	cin>>q;
	while (q--){
		cin>>a>>b;
		cout<<su(b) - su(a - 1)<<"\n";
	}
}

• Subtask 1: 50 / 50