Submission #934363

#	Time	Username	Problem	Language	Result	Execution time	Memory
934363		ALTAKEXE	Trol (COCI19_trol)	C++14	50 / 50	1 ms	348 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