Submission #403141

# Submission time Handle Problem Language Result Execution time Memory
403141 2021-05-12T20:06:39 Z rainboy Dancing Elephants (IOI11_elephants) C
97 / 100
9000 ms 15444 KB
#include "elephants.h"
#include <string.h>

#define N	150000
#define LN	17	/* LN = floor(log2(N)) */
#define K	128
#define INF	0x3f3f3f3f

unsigned int X = 12345;

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

int xx[N * 2], ii[N], n, d;

int compare(int i, int j) { return xx[i] != xx[j] ? xx[i] - xx[j] : i - j; }

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 = compare(ii[j], 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[k] = tmp;
			}
		}
		sort(ii, l, i);
		l = k;
	}
}

int pp[LN + 1][N + 1], ii_[K * 2], k;

void build() {
	static int ii1[N];
	int n_, n1, k_, g, i, j, l;

	n_ = 0;
	for (i = 0; i < n; i++)
		if (xx[n + ii[i]] == -1)
			ii[n_++] = ii[i];
	k_ = 0;
	for (g = 0; g < k; g++)
		if (ii_[g] >= n)
			xx[ii_[g] - n] = xx[ii_[g]], xx[ii_[g]] = -1, ii_[k_++] = ii_[g] - n;
	i = 0, j = 0, n1 = 0;
	while (i < n_ || j < k_)
		ii1[n1++] = i < n_ && (j == k_ || compare(ii[i], ii_[j]) < 0) ? ii[i++] : ii_[j++];
	memcpy(ii, ii1, n * sizeof *ii1);
	for (i = 0, j = 0; i < n; i++) {
		while (j < n && xx[ii[j]] - xx[ii[i]] <= d)
			j++;
		pp[0][i] = j;
	}
	pp[0][n] = n;
	for (l = 1; l <= LN; l++)
		for (i = 0; i <= n; i++)
			pp[l][i] = pp[l - 1][pp[l - 1][i]];
	k = 0;
}

void init(int n_, int d_, int *xx_) {
	int i;

	n = n_, d = d_;
	for (i = 0; i < n; i++)
		ii[i] = i;
	sort(ii, 0, n);
	memcpy(xx, xx_, n * sizeof *xx_), memset(xx + n, -1, n * sizeof *xx);
	build();
}

void bubble(int i) {
	int g, tmp;

	for (g = 0; g < k; g++)
		if (ii_[g] == i)
			break;
	while (g > 0 && compare(ii_[g], ii_[g - 1]) < 0)
		tmp = ii_[g], ii_[g] = ii_[g - 1], ii_[g - 1] = tmp, g--;
	while (g + 1 < k && compare(ii_[g], ii_[g + 1]) > 0)
		tmp = ii_[g], ii_[g] = ii_[g + 1], ii_[g + 1] = tmp, g++;
}

int solve() {
	int g, x, h, l, ans;

	ans = 0;
	for (g = 0, x = -INF, h = 0; g < k; g++) {
		int i_ = ii_[g];

		if (h < n && compare(ii[h], i_) < 0) {
			for (l = LN; l >= 0; l--)
				if (pp[l][h] < n && compare(ii[pp[l][h]], i_) < 0)
					ans += 1 << l, h = pp[l][h];
			ans++, x = xx[ii[h]], h = pp[0][h];
		}
		if (xx[i_] - x <= d)
			continue;
		if (i_ < n)
			h++;
		else {
			ans++, x = xx[i_];
			if (h < n && xx[ii[h]] - x <= d) {
				for (l = LN; l >= 0; l--)
					if (h + (1 << l) < n && xx[ii[h + (1 << l)]] - x <= d)
						h += 1 << l;
				h++;
			}
		}
	}
	if (h < n) {
		for (l = LN; l >= 0; l--)
			if (pp[l][h] < n)
				ans += 1 << l, h = pp[l][h];
		ans++;
	}
	return ans;
}

int update(int i, int y) {
	if (xx[n + i] == -1) {
		if (k == K * 2)
			build();
		ii_[k++] = i, bubble(i);
		ii_[k++] = n + i, xx[n + i] = y, bubble(n + i);
	} else
		xx[n + i] = y, bubble(n + i);
	return solve();
}
# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 378 ms 2100 KB Output is correct
8 Correct 411 ms 2636 KB Output is correct
9 Correct 1158 ms 5480 KB Output is correct
10 Correct 467 ms 5484 KB Output is correct
11 Correct 464 ms 5572 KB Output is correct
12 Correct 1878 ms 5476 KB Output is correct
13 Correct 458 ms 5480 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 378 ms 2100 KB Output is correct
8 Correct 411 ms 2636 KB Output is correct
9 Correct 1158 ms 5480 KB Output is correct
10 Correct 467 ms 5484 KB Output is correct
11 Correct 464 ms 5572 KB Output is correct
12 Correct 1878 ms 5476 KB Output is correct
13 Correct 458 ms 5480 KB Output is correct
14 Correct 663 ms 2776 KB Output is correct
15 Correct 751 ms 3316 KB Output is correct
16 Correct 2985 ms 5712 KB Output is correct
17 Correct 3622 ms 7512 KB Output is correct
18 Correct 3426 ms 7508 KB Output is correct
19 Correct 900 ms 7512 KB Output is correct
20 Correct 3580 ms 7512 KB Output is correct
21 Correct 3367 ms 7516 KB Output is correct
22 Correct 882 ms 7620 KB Output is correct
# Verdict Execution time Memory Grader output
1 Correct 1 ms 332 KB Output is correct
2 Correct 1 ms 332 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 2 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 378 ms 2100 KB Output is correct
8 Correct 411 ms 2636 KB Output is correct
9 Correct 1158 ms 5480 KB Output is correct
10 Correct 467 ms 5484 KB Output is correct
11 Correct 464 ms 5572 KB Output is correct
12 Correct 1878 ms 5476 KB Output is correct
13 Correct 458 ms 5480 KB Output is correct
14 Correct 663 ms 2776 KB Output is correct
15 Correct 751 ms 3316 KB Output is correct
16 Correct 2985 ms 5712 KB Output is correct
17 Correct 3622 ms 7512 KB Output is correct
18 Correct 3426 ms 7508 KB Output is correct
19 Correct 900 ms 7512 KB Output is correct
20 Correct 3580 ms 7512 KB Output is correct
21 Correct 3367 ms 7516 KB Output is correct
22 Correct 882 ms 7620 KB Output is correct
23 Execution timed out 9011 ms 15444 KB Time limit exceeded
24 Halted 0 ms 0 KB -