Submission #735905

#	Time	Username	Problem	Language	Result	Execution time	Memory
735905		Dulguun88	Trol (COCI19_trol)	C++14	50 / 50	1 ms	212 KiB

trol

#include <bits/stdc++.h>
using namespace std;
int q;
long long  l, r; 
long long  sum1(int a, int b) {
    return (a + b) * (b - a + 1) / 2;
}
long long sum(long long x) {
    long long  t = x / 9;
    x %= 9;
    return sum1(1, 9) * t + sum1(1, x);
}
int main() {
cin >> q;
    while (q--) {
        cin >> l >> r;
        cout << sum(r) - sum(l - 1) << '\n';
    }   
}

• Subtask 1: 50 / 50