Submission #643277

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
643277	2022-09-21T16:02:56 Z	valerikk	Tents (JOI18_tents)	C++17	100 / 100	116 ms	70720 KB

tents

#include <cstdio>

#define MOD 1000000007

#define MAX 3003

long long dp[MAX][MAX];

int main() {
  int H, W;
  scanf("%d%d", &H, &W);

  dp[0][0] = 1;
  for (int w = 1; w <= W; ++w) {
    dp[0][w] = 1;
  }
  for (int h = 1; h <= H; ++h) {
    dp[h][0] = 1;
  }

  for (int h = 1; h <= H; ++h) {
    for (int w = 1; w <= W; ++w) {
      dp[h][w] = (dp[h][w] + dp[h - 1][w]) % MOD;
      
      if (w >= 2)
        dp[h][w] = (dp[h][w] + w * 1LL * (w - 1) / 2 % MOD * dp[h - 1][w - 2]) % MOD;

      dp[h][w] = (dp[h][w] + w * 4 * dp[h - 1][w - 1]) % MOD;

      if (h >= 2)
        dp[h][w] = (dp[h][w] + w * 1LL * (h - 1) * dp[h - 2][w - 1]) % MOD;
    }
  }

  printf("%lld\n", (dp[H][W] - 1 + MOD) % MOD);
}

Compilation message

tents.cpp: In function 'int main()':
tents.cpp:11:8: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   11 |   scanf("%d%d", &H, &W);
      |   ~~~~~^~~~~~~~~~~~~~~~

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	468 KB	Output is correct
4	Correct	1 ms	1060 KB	Output is correct
5	Correct	1 ms	616 KB	Output is correct
6	Correct	1 ms	1316 KB	Output is correct
7	Correct	1 ms	724 KB	Output is correct
8	Correct	1 ms	1364 KB	Output is correct
9	Correct	1 ms	724 KB	Output is correct
10	Correct	1 ms	1748 KB	Output is correct
11	Correct	0 ms	340 KB	Output is correct
12	Correct	2 ms	2132 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	0 ms	212 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	0 ms	468 KB	Output is correct
4	Correct	1 ms	1060 KB	Output is correct
5	Correct	1 ms	616 KB	Output is correct
6	Correct	1 ms	1316 KB	Output is correct
7	Correct	1 ms	724 KB	Output is correct
8	Correct	1 ms	1364 KB	Output is correct
9	Correct	1 ms	724 KB	Output is correct
10	Correct	1 ms	1748 KB	Output is correct
11	Correct	0 ms	340 KB	Output is correct
12	Correct	2 ms	2132 KB	Output is correct
13	Correct	0 ms	212 KB	Output is correct
14	Correct	4 ms	9556 KB	Output is correct
15	Correct	78 ms	55104 KB	Output is correct
16	Correct	5 ms	3924 KB	Output is correct
17	Correct	18 ms	12816 KB	Output is correct
18	Correct	22 ms	16988 KB	Output is correct
19	Correct	86 ms	62924 KB	Output is correct
20	Correct	69 ms	50764 KB	Output is correct
21	Correct	50 ms	33728 KB	Output is correct
22	Correct	46 ms	35404 KB	Output is correct
23	Correct	29 ms	26960 KB	Output is correct
24	Correct	115 ms	70720 KB	Output is correct
25	Correct	88 ms	61060 KB	Output is correct
26	Correct	106 ms	66540 KB	Output is correct
27	Correct	116 ms	68900 KB	Output is correct