제출 #975558

#제출 시각아이디문제언어결과실행 시간메모리
975558vjudge1Trol (COCI19_trol)C++17
50 / 50
1 ms392 KiB
#include <bits/stdc++.h>
#define ll long long
using namespace std;

bool bad[105] = {};
int main() {
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	int Q;
	ll L, R;
	cin >> Q;
	while (Q--) {
		cin >> L >> R;
		ll ans = (R/9) * 45 + ((R%9) * (R%9 + 1)) / 2;
		if (L > 1) {
			L--;
			ans -= (L/9) * 45 + ((L%9) * (L%9 + 1)) / 2;
		}
		cout << ans << '\n';
	}
}
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