oj.uz

Submission #139849

# Submission time Handle Problem Language Result Execution time Memory
139849 2019-08-01T14:34:59 Z Saboon Boat (APIO16_boat) C++14
100 / 100
 1012 ms 6520 KB 
#include <algorithm>
#include <cstring>
#include <cstdio>
using ll = long long;
constexpr int MOD = 1e9 + 7;
inline int quick_pow(int a, int n)
{
	int res = 1;
	while (n)
	{
		if (n & 1)
			res = (ll)res * a % MOD;
		a = (ll)a * a % MOD;
		n >>= 1;
	}
	return res;
}
int lp[505], rp[505], app[1005], dp[1005][505], nxt[1005][505], sum[1005][505], inv[505];
int main()
{
	// freopen("uoj-204.in", "r", stdin);
	int n, cnt = 0;
	scanf("%d", &n);
	for (int i = 0; i < n; i++)
	{
		scanf("%d%d", lp + i, rp + i);
		app[cnt++] = lp[i];
		app[cnt++] = ++rp[i];
	}
	std::sort(app, app + cnt);
	cnt = std::unique(app, app + cnt) - app;
	for (int i = 0; i < n; i++)
	{
		lp[i] = std::lower_bound(app, app + cnt, lp[i]) - app;
		rp[i] = std::lower_bound(app, app + cnt, rp[i]) - app;
	}
	inv[0] = inv[1] = 1;
	for (int i = 2; i <= n; i++)
		inv[i] = (ll)(MOD - MOD / i) * inv[MOD % i] % MOD;
	dp[0][0] = 1;
	for (int i = 0; i < n; i++)
	{
		memcpy(nxt, dp, sizeof(dp));
		memset(sum, 0, sizeof(sum));
		for (int j = 0; j < cnt; j++)
		{
			for (int k = 0; k <= i; k++)
				sum[j + 1][k] = (sum[j][k] + dp[j][k]) % MOD;
		}
		for (int j = lp[i]; j < rp[i]; j++)
		{
			int len = app[j + 1] - app[j];
			for (int k = 0; k <= i; k++)
			{
				nxt[j][k + 1] = (nxt[j][k + 1] + (ll)dp[j][k] * (len - k) % MOD * inv[k + 1]) % MOD;
				nxt[j][1] = (nxt[j][1] + (ll)sum[j][k] * len) % MOD;
			}
		}
		memcpy(dp, nxt, sizeof(dp));
	}
	int ans = 0;
	for (int i = 0; i < cnt; i++)
	{
		for (int j = 0; j <= n; j++)
			ans = (ans + dp[i][j]) % MOD;
	}
	printf("%d\n", (ans + MOD - 1) % MOD);
	return 0;
}

Compilation message

boat.cpp: In function 'int main()':
boat.cpp:23:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
boat.cpp:26:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d%d", lp + i, rp + i);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
9.0 / 9.0

# Verdict Execution time Memory Grader output
1 Correct 511 ms 6392 KB Output is correct
2 Correct 499 ms 6264 KB Output is correct
3 Correct 539 ms 6392 KB Output is correct
4 Correct 516 ms 6320 KB Output is correct
5 Correct 527 ms 6316 KB Output is correct
6 Correct 508 ms 6316 KB Output is correct
7 Correct 499 ms 6392 KB Output is correct
8 Correct 506 ms 6392 KB Output is correct
9 Correct 500 ms 6392 KB Output is correct
10 Correct 508 ms 6392 KB Output is correct
11 Correct 513 ms 6316 KB Output is correct
12 Correct 503 ms 6392 KB Output is correct
13 Correct 510 ms 6392 KB Output is correct
14 Correct 500 ms 6264 KB Output is correct
15 Correct 499 ms 6392 KB Output is correct
16 Correct 303 ms 6264 KB Output is correct
17 Correct 324 ms 6264 KB Output is correct
18 Correct 296 ms 6264 KB Output is correct
19 Correct 307 ms 6264 KB Output is correct
20 Correct 296 ms 6264 KB Output is correct

Subtask #2
22.0 / 22.0

# Verdict Execution time Memory Grader output
1 Correct 511 ms 6392 KB Output is correct
2 Correct 499 ms 6264 KB Output is correct
3 Correct 539 ms 6392 KB Output is correct
4 Correct 516 ms 6320 KB Output is correct
5 Correct 527 ms 6316 KB Output is correct
6 Correct 508 ms 6316 KB Output is correct
7 Correct 499 ms 6392 KB Output is correct
8 Correct 506 ms 6392 KB Output is correct
9 Correct 500 ms 6392 KB Output is correct
10 Correct 508 ms 6392 KB Output is correct
11 Correct 513 ms 6316 KB Output is correct
12 Correct 503 ms 6392 KB Output is correct
13 Correct 510 ms 6392 KB Output is correct
14 Correct 500 ms 6264 KB Output is correct
15 Correct 499 ms 6392 KB Output is correct
16 Correct 303 ms 6264 KB Output is correct
17 Correct 324 ms 6264 KB Output is correct
18 Correct 296 ms 6264 KB Output is correct
19 Correct 307 ms 6264 KB Output is correct
20 Correct 296 ms 6264 KB Output is correct
21 Correct 795 ms 6328 KB Output is correct
22 Correct 782 ms 6520 KB Output is correct
23 Correct 814 ms 6392 KB Output is correct
24 Correct 802 ms 6396 KB Output is correct
25 Correct 783 ms 6392 KB Output is correct
26 Correct 963 ms 6264 KB Output is correct
27 Correct 1004 ms 6392 KB Output is correct
28 Correct 907 ms 6364 KB Output is correct
29 Correct 894 ms 6364 KB Output is correct
30 Correct 510 ms 6264 KB Output is correct
31 Correct 507 ms 6468 KB Output is correct
32 Correct 539 ms 6468 KB Output is correct
33 Correct 529 ms 6264 KB Output is correct
34 Correct 507 ms 6316 KB Output is correct
35 Correct 506 ms 6392 KB Output is correct
36 Correct 505 ms 6264 KB Output is correct
37 Correct 516 ms 6364 KB Output is correct
38 Correct 510 ms 6396 KB Output is correct

Subtask #3
27.0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 63 ms 6392 KB Output is correct
2 Correct 61 ms 6440 KB Output is correct
3 Correct 64 ms 6392 KB Output is correct
4 Correct 63 ms 6264 KB Output is correct
5 Correct 63 ms 6268 KB Output is correct
6 Correct 63 ms 6264 KB Output is correct
7 Correct 65 ms 6308 KB Output is correct
8 Correct 63 ms 6264 KB Output is correct
9 Correct 63 ms 6264 KB Output is correct
10 Correct 66 ms 6392 KB Output is correct
11 Correct 60 ms 6264 KB Output is correct
12 Correct 61 ms 6264 KB Output is correct
13 Correct 61 ms 6264 KB Output is correct
14 Correct 63 ms 6264 KB Output is correct
15 Correct 61 ms 6264 KB Output is correct
16 Correct 60 ms 6312 KB Output is correct
17 Correct 61 ms 6312 KB Output is correct
18 Correct 59 ms 6264 KB Output is correct
19 Correct 59 ms 6308 KB Output is correct
20 Correct 61 ms 6312 KB Output is correct

Subtask #4
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 511 ms 6392 KB Output is correct
2 Correct 499 ms 6264 KB Output is correct
3 Correct 539 ms 6392 KB Output is correct
4 Correct 516 ms 6320 KB Output is correct
5 Correct 527 ms 6316 KB Output is correct
6 Correct 508 ms 6316 KB Output is correct
7 Correct 499 ms 6392 KB Output is correct
8 Correct 506 ms 6392 KB Output is correct
9 Correct 500 ms 6392 KB Output is correct
10 Correct 508 ms 6392 KB Output is correct
11 Correct 513 ms 6316 KB Output is correct
12 Correct 503 ms 6392 KB Output is correct
13 Correct 510 ms 6392 KB Output is correct
14 Correct 500 ms 6264 KB Output is correct
15 Correct 499 ms 6392 KB Output is correct
16 Correct 303 ms 6264 KB Output is correct
17 Correct 324 ms 6264 KB Output is correct
18 Correct 296 ms 6264 KB Output is correct
19 Correct 307 ms 6264 KB Output is correct
20 Correct 296 ms 6264 KB Output is correct
21 Correct 795 ms 6328 KB Output is correct
22 Correct 782 ms 6520 KB Output is correct
23 Correct 814 ms 6392 KB Output is correct
24 Correct 802 ms 6396 KB Output is correct
25 Correct 783 ms 6392 KB Output is correct
26 Correct 963 ms 6264 KB Output is correct
27 Correct 1004 ms 6392 KB Output is correct
28 Correct 907 ms 6364 KB Output is correct
29 Correct 894 ms 6364 KB Output is correct
30 Correct 510 ms 6264 KB Output is correct
31 Correct 507 ms 6468 KB Output is correct
32 Correct 539 ms 6468 KB Output is correct
33 Correct 529 ms 6264 KB Output is correct
34 Correct 507 ms 6316 KB Output is correct
35 Correct 506 ms 6392 KB Output is correct
36 Correct 505 ms 6264 KB Output is correct
37 Correct 516 ms 6364 KB Output is correct
38 Correct 510 ms 6396 KB Output is correct
39 Correct 63 ms 6392 KB Output is correct
40 Correct 61 ms 6440 KB Output is correct
41 Correct 64 ms 6392 KB Output is correct
42 Correct 63 ms 6264 KB Output is correct
43 Correct 63 ms 6268 KB Output is correct
44 Correct 63 ms 6264 KB Output is correct
45 Correct 65 ms 6308 KB Output is correct
46 Correct 63 ms 6264 KB Output is correct
47 Correct 63 ms 6264 KB Output is correct
48 Correct 66 ms 6392 KB Output is correct
49 Correct 60 ms 6264 KB Output is correct
50 Correct 61 ms 6264 KB Output is correct
51 Correct 61 ms 6264 KB Output is correct
52 Correct 63 ms 6264 KB Output is correct
53 Correct 61 ms 6264 KB Output is correct
54 Correct 60 ms 6312 KB Output is correct
55 Correct 61 ms 6312 KB Output is correct
56 Correct 59 ms 6264 KB Output is correct
57 Correct 59 ms 6308 KB Output is correct
58 Correct 61 ms 6312 KB Output is correct
59 Correct 866 ms 6324 KB Output is correct
60 Correct 827 ms 6392 KB Output is correct
61 Correct 805 ms 6320 KB Output is correct
62 Correct 842 ms 6264 KB Output is correct
63 Correct 831 ms 6264 KB Output is correct
64 Correct 999 ms 6392 KB Output is correct
65 Correct 994 ms 6324 KB Output is correct
66 Correct 994 ms 6264 KB Output is correct
67 Correct 1012 ms 6328 KB Output is correct
68 Correct 994 ms 6392 KB Output is correct
69 Correct 761 ms 6264 KB Output is correct
70 Correct 761 ms 6264 KB Output is correct
71 Correct 746 ms 6264 KB Output is correct
72 Correct 768 ms 6332 KB Output is correct
73 Correct 771 ms 6352 KB Output is correct
74 Correct 362 ms 6392 KB Output is correct
75 Correct 370 ms 6392 KB Output is correct
76 Correct 369 ms 6280 KB Output is correct
77 Correct 360 ms 6264 KB Output is correct
78 Correct 365 ms 6364 KB Output is correct