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Submission #503259

# Submission time Handle Problem Language Result Execution time Memory
503259 2022-01-07T15:08:58 Z rainboy Osumnjičeni (COCI21_osumnjiceni) C
30 / 110
 1000 ms 5024 KB 
#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_;
int aa[N];

void build(int n) {
	int i;

#if 0
	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;
#endif
	for (i = 0; i < n * 2; i++)
		aa[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(st[i << 1 | 0], lz[i]), put(st[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 i;

	for (i = l; i <= r; i++)
		aa[i] = x;
#if 0
	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_);
#endif
}

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

	for (i = l; i <= r; i++)
		x = min(x, aa[i]);
#if 0
	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--]);
	}
#endif
	return x;
}

int main() {
	static int ii[N * 2], dd[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--;
		memset(dd, 0, n * 2 * sizeof *dd);
		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

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:128:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  128 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
Main.c:130:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  130 |   scanf("%d%d", &xx[i << 1 | 0], &xx[i << 1 | 1]), xx[i << 1 | 1]++;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Main.c:147:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  147 |  scanf("%d", &q);
      |  ^~~~~~~~~~~~~~~
Main.c:151:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  151 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1084 ms 5024 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #2
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 836 KB Output is correct
2 Correct 27 ms 912 KB Output is correct
3 Correct 27 ms 804 KB Output is correct
4 Correct 31 ms 948 KB Output is correct
5 Correct 27 ms 836 KB Output is correct
6 Correct 8 ms 972 KB Output is correct
7 Correct 8 ms 940 KB Output is correct
8 Correct 8 ms 844 KB Output is correct
9 Correct 8 ms 844 KB Output is correct
10 Correct 8 ms 804 KB Output is correct
11 Correct 9 ms 924 KB Output is correct
12 Correct 8 ms 940 KB Output is correct
13 Correct 8 ms 804 KB Output is correct
14 Correct 9 ms 924 KB Output is correct
15 Correct 8 ms 940 KB Output is correct
16 Correct 0 ms 332 KB Output is correct
17 Correct 7 ms 836 KB Output is correct

Subtask #3
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 30 ms 836 KB Output is correct
2 Correct 27 ms 912 KB Output is correct
3 Correct 27 ms 804 KB Output is correct
4 Correct 31 ms 948 KB Output is correct
5 Correct 27 ms 836 KB Output is correct
6 Correct 8 ms 972 KB Output is correct
7 Correct 8 ms 940 KB Output is correct
8 Correct 8 ms 844 KB Output is correct
9 Correct 8 ms 844 KB Output is correct
10 Correct 8 ms 804 KB Output is correct
11 Correct 9 ms 924 KB Output is correct
12 Correct 8 ms 940 KB Output is correct
13 Correct 8 ms 804 KB Output is correct
14 Correct 9 ms 924 KB Output is correct
15 Correct 8 ms 940 KB Output is correct
16 Correct 0 ms 332 KB Output is correct
17 Correct 7 ms 836 KB Output is correct
18 Correct 261 ms 1828 KB Output is correct
19 Correct 232 ms 1836 KB Output is correct
20 Correct 268 ms 1864 KB Output is correct
21 Correct 248 ms 1872 KB Output is correct
22 Correct 243 ms 1860 KB Output is correct
23 Correct 220 ms 1848 KB Output is correct
24 Correct 232 ms 1772 KB Output is correct
25 Correct 235 ms 1848 KB Output is correct
26 Correct 241 ms 1800 KB Output is correct
27 Correct 227 ms 1796 KB Output is correct
28 Correct 208 ms 1344 KB Output is correct
29 Correct 218 ms 1568 KB Output is correct
30 Correct 216 ms 1352 KB Output is correct
31 Correct 211 ms 1332 KB Output is correct
32 Correct 215 ms 1464 KB Output is correct
33 Correct 0 ms 332 KB Output is correct
34 Correct 237 ms 1940 KB Output is correct

Subtask #4
0 / 20.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1094 ms 4984 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 50.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1084 ms 5024 KB Time limit exceeded
2 Halted 0 ms 0 KB -