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Submission #67216

# Submission time Handle Problem Language Result Execution time Memory
67216 2018-08-13T16:07:13 Z Googal Kangaroo (CEOI16_kangaroo) C++14
100 / 100
 80 ms 23808 KB 
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int NMAX = 2 * 1e3 + 1e2;
const ll MOD = 1e9 + 7;

ll n, st, fn;
ll res;
ll dp[NMAX][NMAX];

int main()
{
    ios::sync_with_stdio(false);
	cin >> n >> st >> fn;

	dp[0][0] = 1;

	for(ll i = 1; i < n; i++) {
      if(i == st || i == fn) {
        for(int j = 0; j < i; j++)
          (dp[i][j] += dp[i - 1][j]) %= MOD;
        for(int j = 1; j < i; j++)
          (dp[i][j - 1] += dp[i - 1][j] * j % MOD) %= MOD;
          continue;
      }

      for(ll j = 0; j < i; j++) {
        if(j >= 2){
          (dp[i][j - 1] += dp[i - 1][j] * j % MOD * (j - 1) % MOD) %= MOD;
        }

        if(i >= st){
          (dp[i][j - 1] += dp[i - 1][j] * j % MOD) %= MOD;
        }

        if(i >= fn){
          (dp[i][j - 1] += dp[i - 1][j] * j % MOD) %= MOD;
        }

        (dp[i][j + 1] += dp[i - 1][j]) %= MOD;
      }
	}

	cout << dp[n - 1][0] << '\n';

	return 0;
}

Compilation message

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:25:9: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
         for(int j = 1; j < i; j++)
         ^~~
kangaroo.cpp:27:11: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
           continue;
           ^~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 448 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 448 KB Output is correct
3 Correct 2 ms 596 KB Output is correct
4 Correct 2 ms 784 KB Output is correct
5 Correct 3 ms 784 KB Output is correct
6 Correct 3 ms 784 KB Output is correct
7 Correct 3 ms 784 KB Output is correct
8 Correct 4 ms 812 KB Output is correct
9 Correct 3 ms 816 KB Output is correct
10 Correct 3 ms 820 KB Output is correct
11 Correct 2 ms 824 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 448 KB Output is correct
3 Correct 2 ms 596 KB Output is correct
4 Correct 2 ms 784 KB Output is correct
5 Correct 3 ms 784 KB Output is correct
6 Correct 3 ms 784 KB Output is correct
7 Correct 3 ms 784 KB Output is correct
8 Correct 4 ms 812 KB Output is correct
9 Correct 3 ms 816 KB Output is correct
10 Correct 3 ms 820 KB Output is correct
11 Correct 2 ms 824 KB Output is correct
12 Correct 4 ms 1596 KB Output is correct
13 Correct 4 ms 1600 KB Output is correct
14 Correct 4 ms 1608 KB Output is correct
15 Correct 4 ms 1612 KB Output is correct
16 Correct 4 ms 1628 KB Output is correct
17 Correct 5 ms 1628 KB Output is correct
18 Correct 4 ms 1628 KB Output is correct
19 Correct 4 ms 1628 KB Output is correct
20 Correct 4 ms 1632 KB Output is correct

Subtask #4
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 376 KB Output is correct
2 Correct 2 ms 448 KB Output is correct
3 Correct 2 ms 596 KB Output is correct
4 Correct 2 ms 784 KB Output is correct
5 Correct 3 ms 784 KB Output is correct
6 Correct 3 ms 784 KB Output is correct
7 Correct 3 ms 784 KB Output is correct
8 Correct 4 ms 812 KB Output is correct
9 Correct 3 ms 816 KB Output is correct
10 Correct 3 ms 820 KB Output is correct
11 Correct 2 ms 824 KB Output is correct
12 Correct 4 ms 1596 KB Output is correct
13 Correct 4 ms 1600 KB Output is correct
14 Correct 4 ms 1608 KB Output is correct
15 Correct 4 ms 1612 KB Output is correct
16 Correct 4 ms 1628 KB Output is correct
17 Correct 5 ms 1628 KB Output is correct
18 Correct 4 ms 1628 KB Output is correct
19 Correct 4 ms 1628 KB Output is correct
20 Correct 4 ms 1632 KB Output is correct
21 Correct 11 ms 4972 KB Output is correct
22 Correct 12 ms 5480 KB Output is correct
23 Correct 13 ms 5996 KB Output is correct
24 Correct 80 ms 23716 KB Output is correct
25 Correct 66 ms 23808 KB Output is correct
26 Correct 69 ms 23808 KB Output is correct
27 Correct 74 ms 23808 KB Output is correct
28 Correct 41 ms 23808 KB Output is correct