Submission #198537

#	Time	Username	Problem	Language	Result	Execution time	Memory
198537		alrad	Trol (COCI19_trol)	C++17	50 / 50	6 ms	376 KiB

trol

#include <bits/stdc++.h>

using namespace std;

long long sumUpTo(long long x) {
   return (x * (x + 1) / 2);
}

long long calc(long long high) {
   return ((high / 9) * sumUpTo(9)) + (sumUpTo(high % 9));
}

void solve() {
   long long l , r;
   cin >> l >> r;
   cout << calc(r) - calc(l - 1) << '\n';
}

int main() {
   ios_base :: sync_with_stdio(0);
   cin.tie(0) , cout.tie(0);
   int q;
   cin >> q;
   while (q-- > 0)
      solve();
   return 0;
}

• Subtask 1: 50 / 50