Submission #1192152

#	Time	Username	Problem	Language	Result	Execution time	Memory
1192152		SmuggingSpun	Trol (COCI19_trol)	C++20	50 / 50	1 ms	328 KiB

trol

#include<bits/stdc++.h>
#define taskname "A"
using namespace std;
typedef long long ll;
ll f(ll n){
	return 45LL * (n / 9LL) + (((n % 9LL) * (n % 9LL + 1)) >> 1LL);
}
int main(){
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
	if(fopen(taskname".inp", "r")){
		freopen(taskname".inp", "r", stdin);
	}
	int _t;
	cin >> _t;
	for(int _ = 0; _ < _t; _++){
		ll l, r;
		cin >> l >> r;
		cout << f(r) - f(l - 1) << "\n";
	}
}

Compilation message (stderr)

trol.cpp: In function 'int main()':
trol.cpp:11:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |                 freopen(taskname".inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 50 / 50