oj.uz

Submission #710791

# Submission time Handle Problem Language Result Execution time Memory
710791 2023-03-15T19:48:30 Z rainboy Skyscraper (JOI16_skyscraper) C
15 / 100
 1 ms 344 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);
	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:38:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |   scanf("%d", &aa[i]);
      |   ^~~~~~~~~~~~~~~~~~~

Subtask #1
0 / 5.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 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 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 340 KB Output is correct

Subtask #3
0 / 80.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -