Submission #787976

#	Time	Username	Problem	Language	Result	Execution time	Memory
787976		rainboy	Gym Badges (NOI22_gymbadges)	C11	0 / 100	382 ms	33568 KiB

Main

#include <stdio.h>
#include <string.h>

#define N	500000
#define N_	(1 << 19)	/* N_ = pow2(ceil(log2(N))) */
#define INF	0x3f3f3f3f3f3f3f3fLL

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

unsigned int X = 12345;

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

int *vv;

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 (vv[ii[j]] == vv[i_])
				j++;
			else if (vv[ii[j]] < vv[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;
	}
}

long long ss[N_ * 2], dd[N_ * 2]; int n_;

void pul(int i) {
	int l = i << 1, r = l | 1;

	ss[i] = ss[l] + ss[r];
	dd[i] = min(dd[l], dd[r] == INF ? INF : dd[r] - ss[l]);
}

void build(int n) {
	int i;

	n_ = 1;
	while (n_ < n)
		n_ <<= 1;
	memset(dd + n_, 0x3f, n_ * sizeof *dd);
	for (i = 0; i < n; i++)
		dd[n_ + i] = INF;
	for (i = n_ - 1; i > 0; i--)
		pul(i);
}

void update(int i, int x, long long y) {
	i += n_;
	ss[i] = x, dd[i] = y;
	while (i > 1)
		pul(i >>= 1);
}

int main() {
	static int xx[N], yy[N], ii[N], idx[N];
	int n, h, i, k;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d", &xx[i]);
	for (i = 0; i < n; i++)
		scanf("%d", &yy[i]);
	for (i = 0; i < n; i++)
		ii[i] = i;
	vv = yy, sort(ii, 0, n);
	for (i = 0; i < n; i++)
		idx[ii[i]] = i;
	vv = xx, sort(ii, 0, n);
	build(n);
	k = 0;
	for (h = 0; h < n; h++) {
		i = ii[h];
		update(idx[i], xx[i], yy[i]);
		if (dd[1] >= 0)
			k++;
		else
			update(idx[i], 0, INF);
	}
	printf("%d\n", k);
	return 0;
}

Compilation message (stderr)

Main.c: In function 'main':
Main.c:70:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
Main.c:72:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |   scanf("%d", &xx[i]);
      |   ^~~~~~~~~~~~~~~~~~~
Main.c:74:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |   scanf("%d", &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 15
• Subtask 2: 0 / 9
• Subtask 3: 0 / 27
• Subtask 4: 0 / 49