Submission #826341

#	Time	Username	Problem	Language	Result	Execution time	Memory
826341		rainboy	Trampoline (info1cup20_trampoline)	C11	0 / 100	2073 ms	6700 KiB

trampoline

#include <stdio.h>

#define N	200000
#define L	17	/* L = floor(log2(N)) */

unsigned int Z = 12345;

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

int xx[N], yy[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) {
			int c = xx[ii[j]] != xx[i_] ? xx[ii[j]] - xx[i_] : yy[ii[j]] - yy[i_];

			if (c == 0)
				j++;
			else if (c < 0) {
				tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = ii[j], ii[j] = ii[k], ii[i] = tmp;
			}
		}
		sort(ii, l, i);
		l = k;
	}
}

int search(int *ii, int n, int x, int y) {
	int lower = -1, upper = n;

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

		if (xx[ii[i]] > x || xx[ii[i]] == x && yy[ii[i]] >= y)
			upper = i;
		else
			lower = i;
	}
	return upper == n || xx[ii[upper]] > x ? -1 : ii[upper];
}

int main() {
	static int ii[N], pp[L + 1][N];
	int n, t, i, l;

	scanf("%*d%*d%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d%d", &xx[i], &yy[i]);
		ii[i] = i;
	}
	sort(ii, 0, n);
	for (i = 0; i < n; i++)
		pp[0][i] = search(ii, n, xx[i] + 1, yy[i]);
	for (l = 0; l < L; l++)
		for (i = 0; i < n; i++)
			pp[l + 1][i] = pp[l][i] == -1 ? -1 : pp[l][pp[l][i]];
	scanf("%d", &t);
	while (t--) {
		int x1, y1, x2, y2;

		scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
		if (x1 > x2) {
			printf("No\n");
			continue;
		}
		if (x1 == x2) {
			printf(y1 <= y2 ? "Yes\n" : "No\n");
			continue;
		}
		if (x2 - x1 > n) {
			printf("No\n");
			continue;
		}
		i = search(ii, n, x1, y1);
		if (i == -1) {
			printf("No\n");
			continue;
		}
		x1++;
		for (l = L; l >= 0 && i != -1; l--)
			if (x2 - x1 >= 1 << l)
				x1 += 1 << l, i = pp[l][i];
		printf(i != -1 && yy[i] <= y2 ? "Yes\n" : "No\n");
	}
	return 0;
}

Compilation message (stderr)

trampoline.c: In function 'search':
trampoline.c:42:39: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   42 |   if (xx[ii[i]] > x || xx[ii[i]] == x && yy[ii[i]] >= y)
      |                        ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~
trampoline.c: In function 'main':
trampoline.c:54:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   54 |  scanf("%*d%*d%d", &n);
      |  ^~~~~~~~~~~~~~~~~~~~~
trampoline.c:56:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   56 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
trampoline.c:65:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   65 |  scanf("%d", &t);
      |  ^~~~~~~~~~~~~~~
trampoline.c:69:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   69 |   scanf("%d%d%d%d", &x1, &y1, &x2, &y2);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 23
• Subtask 2: 0 / 20
• Subtask 3: 0 / 11
• Subtask 4: 0 / 19
• Subtask 5: 0 / 27