제출 #976633

#제출 시각아이디문제언어결과실행 시간메모리
976633vjudge1Trol (COCI19_trol)C++17
30 / 50
1 ms348 KiB
#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'; } }
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