제출 #977187

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
977187		vjudge1	Trol (COCI19_trol)	C++17	50 / 50	1 ms	348 KiB

trol

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n' 
#define debug(x) cerr << #x << " --> " << x << endl;
#define shine ios_base::sync_with_stdio(false), cin.tie(nullptr);
const ll mod = 1e9 + 7;
const ll inf = 1e18;

int main(){
    shine
    ll q;
    cin >> q;
    while(q--){
        ll l, r;
        cin >> l >> r;
        l--;
        ll cnt1 = (r / 9), cnt2 = (l / 9), mod1 = r % 9, mod2 = l % 9;
        ll ans = 45*(cnt1 - cnt2) + ((mod1*(mod1+1)-(mod2*(mod2+1))) >> 1);
        cout << ans << endl;
    }
}

• Subtask 1: 50 / 50