Submission #976633

#	Time	Username	Problem	Language	Result	Execution time	Memory
976633		vjudge1	Trol (COCI19_trol)	C++17	30 / 50	1 ms	348 KiB

trol

#include <iostream>
#include <cmath>
using namespace std;

const int SUM = 45;

int main() {
    int q;
    unsigned long long l, r, a, b;
    unsigned long long ans;
    cin >> q;
    while (q--) {
        cin >> l >> r;
        if (l == r) {
            cout << (l % 9 ? l % 9 : 9) << '\n';
            continue;
        }
        a = floor((l - 1)/9.0);
        b = floor((r - 1)/9.0);
        ans = SUM * (b - a);
        a = l%9 ? l%9 : 9;
        b = r%9 ? r%9 : 9;
        ans -= (a)*(a - 1) / 2;
        ans += (b)*(b + 1) / 2;
        cout << ans << '\n';
    }
}

• Subtask 1: 30 / 50