Submission #503260

#	Time	Username	Problem	Language	Result	Execution time	Memory
503260		rainboy	Osumnjičeni (COCI21_osumnjiceni)	C11	110 / 110	447 ms	28952 KiB

Main

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

#define N	200000
#define H_	18	/* H_ = ceil(log2(N)) */
#define N_	(1 << H_ + 1)
#define INF	0x3f3f3f3f

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

unsigned int X = 12345;

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

int xx[N * 2];

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 (xx[ii[j]] == xx[i_])
				j++;
			else if (xx[ii[j]] < xx[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 st[N_ * 2], lz[N_], h_, n_;

void build(int n) {
	int i;

	h_ = 0;
	while (1 << h_ < n * 2)
		h_++;
	n_ = 1 << h_;
	memset(lz, -1, n_ * sizeof *lz);
	for (i = 0; i < n_ * 2; i++)
		st[i] = n;
}

void put(int i, int x) {
	st[i] = x;
	if (i < n_)
		lz[i] = x;
}

void pus(int i) {
	if (lz[i] != -1)
		put(i << 1 | 0, lz[i]), put(i << 1 | 1, lz[i]), lz[i] = -1;
}

void pul(int i) {
	if (lz[i] == -1)
		st[i] = min(st[i << 1 | 0], st[i << 1 | 1]);
}

void push(int i) {
	int h;

	for (h = h_; h > 0; h--)
		pus(i >> h);
}

void pull(int i) {
	while (i > 1)
		pul(i >>= 1);
}

void update(int l, int r, int x) {
	int l_ = l += n_, r_ = r += n_;

	push(l_), push(r_);
	for ( ; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1)
			put(l++, x);
		if ((r & 1) == 0)
			put(r--, x);
	}
	pull(l_), pull(r_);
}

int query(int l, int r) {
	int x = INF;

	push(l += n_), push(r += n_);
	for ( ; l <= r; l >>= 1, r >>= 1) {
		if ((l & 1) == 1)
			x = min(x, st[l++]);
		if ((r & 1) == 0)
			x = min(x, st[r--]);
	}
	return x;
}

int main() {
	static int ii[N * 2], jj[H_ + 1][N];
	int n, q, h, i, j, x;

	scanf("%d", &n);
	for (i = 0; i < n; i++)
		scanf("%d%d", &xx[i << 1 | 0], &xx[i << 1 | 1]), xx[i << 1 | 1]++;
	for (i = 0; i < n * 2; i++)
		ii[i] = i;
	sort(ii, 0, n * 2);
	for (i = 0, x = 0; i < n * 2; i++)
		xx[ii[i]] = i + 1 == n * 2 || xx[ii[i + 1]] != xx[ii[i]] ? x++ : x;
	build(n);
	for (i = n - 1; i >= 0; i--) {
		jj[0][i] = query(xx[i << 1 | 0], xx[i << 1 | 1] - 1);
		update(xx[i << 1 | 0], xx[i << 1 | 1] - 1, i);
	}
	jj[0][n] = n;
	for (i = n - 1; i >= 0; i--)
		jj[0][i] = min(jj[0][i], jj[0][i + 1]);
	for (h = 1; h <= H_; h++)
		for (i = 0; i <= n; i++)
			jj[h][i] = jj[h - 1][jj[h - 1][i]];
	scanf("%d", &q);
	while (q--) {
		int k;

		scanf("%d%d", &i, &j), i--, j--;
		k = 0;
		for (h = H_; h >= 0; h--)
			if (jj[h][i] <= j)
				i = jj[h][i], k += 1 << h;
		k++;
		printf("%d\n", k);
	}
	return 0;
}

Compilation message (stderr)

Main.c:6:15: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
    6 | #define N_ (1 << H_ + 1)
      |               ^~
Main.c:39:8: note: in expansion of macro 'N_'
   39 | int st[N_ * 2], lz[N_], h_, n_;
      |        ^~
Main.c:6:15: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
    6 | #define N_ (1 << H_ + 1)
      |               ^~
Main.c:39:20: note: in expansion of macro 'N_'
   39 | int st[N_ * 2], lz[N_], h_, n_;
      |                    ^~
Main.c: In function 'main':
Main.c:111:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  111 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
Main.c:113:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |   scanf("%d%d", &xx[i << 1 | 0], &xx[i << 1 | 1]), xx[i << 1 | 1]++;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:130:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  130 |  scanf("%d", &q);
      |  ^~~~~~~~~~~~~~~
Main.c:134:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  134 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 50 / 50