제출 #532305

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
532305		rainboy	도넛 (JOI14_ho_t3)	C11	100 / 100	35 ms	2020 KiB

2014_ho_t3

#include <stdio.h>

#define N	100000

long long min(long long a, long long b) { return a < b ? a : b; }
long long max(long long a, long long b) { return a > b ? a : b; }

long long aa[N + 1];

long long solve2(int l, int r) {
	int lower = l, upper = r;

	while (upper - lower > 1) {
		int j = (lower + upper) / 2;

		if (aa[j] - aa[l] < aa[r] - aa[j])
			lower = j;
		else
			upper = j;
	}
	return l == r ? 0 : max(aa[lower] - aa[l], aa[r] - aa[upper]);
}

int main() {
	int n, i, l, r;
	long long ans;

	scanf("%d", &n);
	for (i = 1; i <= n; i++) {
		scanf("%lld", &aa[i]);
		aa[i] += aa[i - 1];
	}
	ans = 0;
	for (l = 0, r = 0; l < n; l++) {
		while (r < n && solve2(l, r) < aa[n] + aa[l] - aa[r])
			r++;
		ans = max(ans, solve2(l, r - 1));
		if (r < n)
			ans = max(ans, aa[n] + aa[l] - aa[r]);
	}
	printf("%lld\n", ans);
	return 0;
}

컴파일 시 표준 에러 (stderr) 메시지

2014_ho_t3.c: In function 'main':
2014_ho_t3.c:28:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   28 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
2014_ho_t3.c:30:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   30 |   scanf("%lld", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 15 / 15
• Subtask 3: 30 / 30
• Subtask 4: 50 / 50