oj.uz

Submission #719264

# Submission time Handle Problem Language Result Execution time Memory
719264 2023-04-05T17:16:45 Z rainboy Giraffes (JOI22_giraffes) C
100 / 100
 6496 ms 1208 KB 
#include <stdio.h>
#include <string.h>

#define N	8000
#define M	(N * 4)
#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 ll[M], rr[M], xx[M], yy[M];

int compare_y(int h1, int h2) {
	return yy[h2] - yy[h1];
}

int compare_r(int h1, int h2) {
	return rr[h2] - rr[h1];
}

int (*compare)(int, int);

void sort(int *hh, int l, int r) {
	while (l < r) {
		int i = l, j = l, k = r, h = hh[l + rand_() % (r - l)], tmp;

		while (j < k) {
			int c = compare(hh[j], h);

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

int ft[N * 2 + 1];

void update(int i, int n, int x) {
	while (i < n) {
		ft[i] = min(ft[i], x);
		i |= i + 1;
	}
}

int query(int i) {
	int x = INF;

	while (i >= 0) {
		x = min(x, ft[i]);
		i &= i + 1, i--;
	}
	return x;
}

int main() {
	static int aa[N], ii[N], hh[M], jj[2][2][N], tt[N];
	int n, m, k, h, h_, i, j, a, u, v, l, x, tmp;

	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &aa[i]), aa[i]--;
		ii[aa[i]] = i;
	}
	m = 0;
	ll[m] = 0, rr[m] = n - 1, xx[m] = 0, yy[m] = n - 1, m++;
	k = 0;
	while (1) {
		for (u = 0; u < 2; u++) {
			for (h = 0; h < m; h++)
				hh[h] = h;
			for (v = 0; v < 2; v++) {
				memset(jj[u][v], 0x3f, n * sizeof *jj[u][v]);
				compare = compare_y, sort(hh, 0, m);
				memset(ft, 0x3f, (n * 2 + 1) * sizeof *ft);
				for (a = n - 1, h = 0; a >= 0; a--) {
					while (h < m && yy[h_ = hh[h]] >= a)
						update(yy[h_] - rr[h_] + n, n * 2 + 1, ll[h_]), h++;
					l = query(a - ii[a] + n);
					if (l != INF)
						jj[u][v][ii[a]] = min(jj[u][v][ii[a]], l);
				}
				compare = compare_r, sort(hh, 0, m);
				memset(ft, 0x3f, (n * 2 + 1) * sizeof *ft);
				for (i = n - 1, h = 0; i >= 0; i--) {
					while (h < m && rr[h_ = hh[h]] >= i)
						update(rr[h_] - yy[h_] + n, n * 2 + 1, xx[h_]), h++;
					x = query(i - aa[i] + n);
					if (x != INF)
						jj[u][v][i] = min(jj[u][v][i], -aa[i] + i + x);
				}
				for (i = 0; i < n; i++) {
					aa[i] = n - 1 - aa[i];
					ii[aa[i]] = i;
				}
				for (h = 0; h < m; h++)
					tmp = n - 1 - xx[h], xx[h] = n - 1 - yy[h], yy[h] = tmp;
			}
			for (a = 0; a < n; a++) {
				ii[a] = n - 1 - ii[a];
				aa[ii[a]] = a;
			}
			for (h = 0; h < m; h++)
				tmp = n - 1 - ll[h], ll[h] = n - 1 - rr[h], rr[h] = tmp;
		}
		for (v = 0; v < 2; v++) {
			for (i = 0; i < n; i++)
				tt[i] = jj[1][v][n - 1 - i] == INF ? -INF : n - 1 - jj[1][v][n - 1 - i];
			memcpy(jj[1][v], tt, n * sizeof *tt);
		}
		m = 0;
		for (i = 0; i < n; i++) {
			if ((j = jj[0][0][i]) <= i)
				ll[m] = j, rr[m] = i - 1, xx[m] = aa[i] - i + j, yy[m] = aa[i] - 1, m++;
			if ((j = jj[0][1][i]) <= i)
				ll[m] = j, rr[m] = i - 1, xx[m] = aa[i] + 1, yy[m] = aa[i] + i - j, m++;
			if ((j = jj[1][0][i]) >= i)
				ll[m] = i + 1, rr[m] = j, xx[m] = aa[i] - j + i, yy[m] = aa[i] - 1, m++;
			if ((j = jj[1][1][i]) >= i)
				ll[m] = i + 1, rr[m] = j, xx[m] = aa[i] + 1, yy[m] = aa[i] + j - i, m++;
		}
		if (m == 0) {
			printf("%d\n", n - k);
			return 0;
		}
		k++;
	}
	return 0;
}

Compilation message

giraffes.c: In function 'main':
giraffes.c:74:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
giraffes.c:76:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   76 |   scanf("%d", &aa[i]), aa[i]--;
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1
10.0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 292 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 292 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 292 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 292 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 292 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 292 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 4 ms 340 KB Output is correct
23 Correct 13 ms 340 KB Output is correct
24 Correct 20 ms 368 KB Output is correct
25 Correct 26 ms 340 KB Output is correct
26 Correct 28 ms 292 KB Output is correct
27 Correct 29 ms 360 KB Output is correct
28 Correct 28 ms 340 KB Output is correct
29 Correct 31 ms 340 KB Output is correct
30 Correct 29 ms 340 KB Output is correct

Subtask #4
41.0 / 41.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 340 KB Output is correct
2 Correct 0 ms 292 KB Output is correct
3 Correct 0 ms 212 KB Output is correct
4 Correct 0 ms 292 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 1 ms 292 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 0 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct
16 Correct 1 ms 340 KB Output is correct
17 Correct 1 ms 340 KB Output is correct
18 Correct 1 ms 340 KB Output is correct
19 Correct 1 ms 340 KB Output is correct
20 Correct 1 ms 340 KB Output is correct
21 Correct 1 ms 340 KB Output is correct
22 Correct 4 ms 340 KB Output is correct
23 Correct 13 ms 340 KB Output is correct
24 Correct 20 ms 368 KB Output is correct
25 Correct 26 ms 340 KB Output is correct
26 Correct 28 ms 292 KB Output is correct
27 Correct 29 ms 360 KB Output is correct
28 Correct 28 ms 340 KB Output is correct
29 Correct 31 ms 340 KB Output is correct
30 Correct 29 ms 340 KB Output is correct
31 Correct 835 ms 584 KB Output is correct
32 Correct 3743 ms 1000 KB Output is correct
33 Correct 6263 ms 1208 KB Output is correct
34 Correct 6363 ms 1204 KB Output is correct
35 Correct 6293 ms 1204 KB Output is correct
36 Correct 6433 ms 1204 KB Output is correct
37 Correct 6409 ms 1204 KB Output is correct
38 Correct 6496 ms 1204 KB Output is correct
39 Correct 6401 ms 1204 KB Output is correct
40 Correct 6349 ms 1208 KB Output is correct