Submission #882227

#	Time	Username	Problem	Language	Result	Execution time	Memory
882227		rainboy	Cambridge (info1cup18_cambridge)	C11	100 / 100	62 ms	9968 KiB

cambridge

#include <stdio.h>

#define N	100000
#define N_	(1 << 17)	/* 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 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)
			if (yy[ii[j]] == yy[i_])
				j++;
			else if (yy[ii[j]] < yy[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], st[N_ * 2]; int n_;

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

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

void build(int n) {
	int i;

	n_ = 1;
	while (n_ < n)
		n_ <<= 1;
	for (i = 0; i < n_; i++)
		st[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, st[i] = y == INF ? INF : y - x;
	while (i > 1)
		pul(i >>= 1);
}

int main() {
	static int ii[N], idx[N], jj[N];
	int n, q, i, j;

	scanf("%d%d", &n, &q);
	for (i = 0; i < n; i++)
		scanf("%d%d", &xx[i], &yy[i]), yy[i]--;
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	for (i = 0; i < n; i++)
		idx[ii[i]] = i;
	build(n);
	for (i = 0, j = -1; i < n; i++) {
		while (j < n && st[1] >= 0) {
			j++;
			if (j == n)
				break;
			update(idx[j], xx[j], yy[j]);
		}
		jj[i] = j;
		update(idx[i], 0, INF);
	}
	while (q--) {
		scanf("%d%d", &i, &j), i--, j--;
		printf(j < jj[i] ? "1\n" : "0\n");
	}
	return 0;
}

Compilation message (stderr)

cambridge.c: In function 'main':
cambridge.c:68:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   68 |  scanf("%d%d", &n, &q);
      |  ^~~~~~~~~~~~~~~~~~~~~
cambridge.c:70:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   70 |   scanf("%d%d", &xx[i], &yy[i]), yy[i]--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cambridge.c:88:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   88 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 15 / 15
• Subtask 2: 25 / 25
• Subtask 3: 15 / 15
• Subtask 4: 45 / 45