oj.uz

Submission #710792

# Submission time Handle Problem Language Result Execution time Memory
710792 2023-03-15T19:49:59 Z rainboy Skyscraper (JOI16_skyscraper) C
100 / 100
 171 ms 3432 KB 
#include <stdio.h>

#define N	100
#define L	1000
#define MD	1000000007

unsigned int X = 12345;

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

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

		while (j < k)
			if (aa[j] == a)
				j++;
			else if (aa[j] < a) {
				tmp = aa[i], aa[i] = aa[j], aa[j] = tmp;
				i++, j++;
			} else {
				k--;
				tmp = aa[j], aa[j] = aa[k], aa[k] = tmp;
			}
		sort(aa, l, i);
		l = k;
	}
}

int main() {
	static int aa[N], dp[N + 1][L + 1][2][2], dq[N + 1][L + 1][2][2];
	int n, l, i, c, d, d_, s, t, a, ans;

	scanf("%d%d", &n, &l);
	if (n == 1) {
		printf("1\n");
		return 0;
	}
	for (i = 0; i < n; i++)
		scanf("%d", &aa[i]);
	sort(aa, 0, n);
	dp[0][0][0][0] = 1;
	for (i = 0; i + 1 < n; i++) {
		for (c = 0; c <= n; c++)
			for (d = 0; d <= l; d++)
				for (s = 0; s < 2; s++)
					for (t = 0; t < 2; t++)
						dq[c][d][s][t] = 0;
		for (c = 0; c <= n; c++)
			for (d = 0; d <= l; d++)
				for (s = 0; s < 2; s++)
					for (t = 0; t < 2; t++) {
						int x = dp[c][d][s][t];

						if (x == 0)
							continue;
						dq[c + 1][d][s][t] = (dq[c + 1][d][s][t] + x) % MD;
						if (s == 0)
							dq[c + 1][d][1][t] = (dq[c + 1][d][1][t] + x) % MD;
						if (t == 0)
							dq[c + 1][d][s][1] = (dq[c + 1][d][s][1] + x) % MD;
						dq[c][d][s][t] = (dq[c][d][s][t] + (long long) x * (c * 2 - s - t)) % MD;
						if (s == 0)
							dq[c][d][1][t] = (dq[c][d][1][t] + (long long) x * (c - t)) % MD;
						if (t == 0)
							dq[c][d][s][1] = (dq[c][d][s][1] + (long long) x * (c - s)) % MD;
						if (c > 0)
							dq[c - 1][d][s][t] = (dq[c - 1][d][s][t] + (long long) x * ((c - s - t) * (c - s - t - 1) + (c - s - t) * (s + t))) % MD;
					}
		a = aa[i + 1] - aa[i];
		for (c = 0; c <= n; c++)
			for (d = 0; d <= l; d++)
				for (s = 0; s < 2; s++)
					for (t = 0; t < 2; t++)
						if (s + t <= c * 2) {
							d_ = a * (c * 2 - s - t);
							dp[c][d][s][t] = d < d_ ? 0 : dq[c][d - d_][s][t];
						}
	}
	ans = 0;
	for (d = 0; d <= l; d++)
		ans = ((long long) ans + dp[1][d][1][0] + dp[1][d][0][1] + dp[2][d][1][1]) % MD;
	printf("%d\n", ans);
	return 0;
}

Compilation message

skyscraper.c: In function 'main':
skyscraper.c:36:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   36 |  scanf("%d%d", &n, &l);
      |  ^~~~~~~~~~~~~~~~~~~~~
skyscraper.c:42:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   42 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 552 KB Output is correct
10 Correct 1 ms 340 KB Output is correct

Subtask #2
15.0 / 15.0

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

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 2 ms 468 KB Output is correct
6 Correct 2 ms 468 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 2 ms 552 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 1 ms 340 KB Output is correct
12 Correct 2 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 0 ms 340 KB Output is correct
18 Correct 0 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 2 ms 596 KB Output is correct
22 Correct 95 ms 2740 KB Output is correct
23 Correct 150 ms 3432 KB Output is correct
24 Correct 114 ms 3420 KB Output is correct
25 Correct 171 ms 3424 KB Output is correct
26 Correct 134 ms 3428 KB Output is correct
27 Correct 39 ms 1868 KB Output is correct
28 Correct 50 ms 2024 KB Output is correct
29 Correct 92 ms 2772 KB Output is correct
30 Correct 158 ms 3428 KB Output is correct