Submission #705534

#	Time	Username	Problem	Language	Result	Execution time	Memory
705534		rainboy	Art Exhibition (JOI18_art)	C11	100 / 100	316 ms	20820 KiB

art

#include <stdio.h>

#define N	500000
#define INF	0x3f3f3f3f3f3f3f3fLL

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

unsigned int X = 12345;

int rand_() {
	return (X *= 3) >> 1;
}

long long aa[N]; int bb[N];

void sort(int *ii, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;

		while (j < k)
			if (aa[ii[j]] == aa[i_])
				j++;
			else if (aa[ii[j]] < aa[i_]) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[k] = tmp;
			}
		sort(ii, l, i);
		l = k;
	}
}

int main() {
	static int ii[N];
	int n, h, i;
	long long ans, x;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%lld%d", &aa[i], &bb[i]);
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	x = -INF, ans = 0;
	for (h = 0; h < n; h++) {
		i = ii[h];
		x = max(x, aa[i]) + bb[i];
		ans = max(ans, x - aa[i]);
	}
	printf("%lld\n", ans);
	return 0;
}

Compilation message (stderr)

art.c: In function 'main':
art.c:40:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
art.c:42:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   scanf("%lld%d", &aa[i], &bb[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 50 / 50