Submission #147615

#	Time	Username	Problem	Language	Result	Execution time	Memory
147615		yoni	Angelic Hourglass (FXCUP3_hourglass)	C++11	100 / 100	2 ms	420 KiB

hourglass

#include <iostream>

int main() {
	int N;
	scanf("%d", &N);
	int cnt5 = N/5;
	int ans = N==7?4:-1;
	N -= cnt5*5;
	while (cnt5 >= 0) {
		if (N % 3 == 0) {
			ans = cnt5 + N/3;
			break;
		}
		cnt5--;
		N += 5;
	}
	printf("%d", ans);
	
	return 0;
}

Compilation message (stderr)

hourglass.cpp: In function 'int main()':
hourglass.cpp:5:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &N);
  ~~~~~^~~~~~~~~~

• Subtask 1: 17 / 17
• Subtask 2: 42 / 42
• Subtask 3: 41 / 41