Submission #229215

#	Time	Username	Problem	Language	Result	Execution time	Memory
229215		VEGAnn	Trol (COCI19_trol)	C++14	50 / 50	6 ms	256 KiB

trol

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

ll ans(ll x){
	ll res = x / 9ll * (45ll);
	ll ost = x % 9;
	for (ll i = 1; i <= ost; i++)
		res += i;
	return res;
}

int main(){
	int qq; cin >> qq;
	
	for (; qq; qq--){
		ll l, r;
		cin >> l >> r;
		cout << ans(r) - ans(l - 1) << '\n';
	}
}

• Subtask 1: 50 / 50