Submission #703234

#	Time	Username	Problem	Language	Result	Execution time	Memory
703234		rainboy	Global Warming (NOI13_gw)	C11	40 / 40	308 ms	17676 KiB

gw

#include <stdio.h>

#define N	1000000

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

unsigned int X = 12345;

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

int aa[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];
	static char active[N];
	int n, i, i_, j, k, k_, a;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	k = 0, k_ = 0;
	for (j = n - 1; j >= 0; j = i) {
		i = j, a = aa[ii[j]];
		while (i >= 0 && aa[ii[i]] == a) {
			i_ = ii[i--];
			k++;
			active[i_] = 1;
			if (i_ > 0 && active[i_ - 1])
				k--;
			if (i_ + 1 < n && active[i_ + 1])
				k--;
		}
		k_ = max(k_, k);
	}
	printf("%d\n", k_);
	return 0;
}

Compilation message (stderr)

gw.c: In function 'main':
gw.c:39:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   39 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
gw.c:41:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   41 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 6 / 6
• Subtask 3: 7 / 7
• Subtask 4: 10 / 10
• Subtask 5: 11 / 11