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Submission #376649

# Submission time Handle Problem Language Result Execution time Memory
376649 2021-03-11T23:45:02 Z thiago4532 Kangaroo (CEOI16_kangaroo) C++17
100 / 100
 52 ms 32108 KB 
#include <bits/stdc++.h>
#define int int64_t

using namespace std;
const int maxn = 2010;
const int mod = 1e9 + 7;
int dp[maxn][maxn];
int n;
int ini, fim;

int solve(int i, int k) {
    if (i == n+1) return (k==1);
    if (dp[i][k] != -1) return dp[i][k];

    int caso1, caso2;
    if (i == ini || i == fim) {
        caso1 = solve(i+1, k+1);
        caso2 = k > 0 ? solve(i+1, k) : 0;
    } else if (i < ini && i < fim) {
        caso1 = (k+1) * solve(i+1, k+1);
        caso2 = k > 1 ? (k-1) * solve(i+1, k-1) : 0;
    } else if (i < ini || i < fim) {
        caso1 = k * solve(i+1, k+1);
        caso2 = k > 1 ? (k-1) * solve(i+1, k-1) : 0;
    } else {
        caso1 = (k-1) * solve(i+1, k+1);
        caso2 = k > 1 ? (k-1) * solve(i+1, k-1) : 0;
    }
    return dp[i][k] = (caso1 + caso2) % mod;
}

int32_t main() {
    memset(dp, -1, sizeof dp);
    cin >> n;
    cin >> ini >> fim;
    cout << solve(1, 0) << '\n';
    return 0;
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 31980 KB Output is correct
2 Correct 17 ms 31980 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 31980 KB Output is correct
2 Correct 17 ms 31980 KB Output is correct
3 Correct 17 ms 31980 KB Output is correct
4 Correct 17 ms 31852 KB Output is correct
5 Correct 18 ms 31980 KB Output is correct
6 Correct 18 ms 32000 KB Output is correct
7 Correct 18 ms 31980 KB Output is correct
8 Correct 18 ms 31980 KB Output is correct
9 Correct 18 ms 31980 KB Output is correct
10 Correct 18 ms 31980 KB Output is correct
11 Correct 18 ms 31980 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 31980 KB Output is correct
2 Correct 17 ms 31980 KB Output is correct
3 Correct 17 ms 31980 KB Output is correct
4 Correct 17 ms 31852 KB Output is correct
5 Correct 18 ms 31980 KB Output is correct
6 Correct 18 ms 32000 KB Output is correct
7 Correct 18 ms 31980 KB Output is correct
8 Correct 18 ms 31980 KB Output is correct
9 Correct 18 ms 31980 KB Output is correct
10 Correct 18 ms 31980 KB Output is correct
11 Correct 18 ms 31980 KB Output is correct
12 Correct 19 ms 31980 KB Output is correct
13 Correct 18 ms 31980 KB Output is correct
14 Correct 18 ms 31980 KB Output is correct
15 Correct 17 ms 31980 KB Output is correct
16 Correct 18 ms 31980 KB Output is correct
17 Correct 18 ms 31980 KB Output is correct
18 Correct 18 ms 31980 KB Output is correct
19 Correct 17 ms 31980 KB Output is correct
20 Correct 17 ms 31980 KB Output is correct

Subtask #4
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 17 ms 31980 KB Output is correct
2 Correct 17 ms 31980 KB Output is correct
3 Correct 17 ms 31980 KB Output is correct
4 Correct 17 ms 31852 KB Output is correct
5 Correct 18 ms 31980 KB Output is correct
6 Correct 18 ms 32000 KB Output is correct
7 Correct 18 ms 31980 KB Output is correct
8 Correct 18 ms 31980 KB Output is correct
9 Correct 18 ms 31980 KB Output is correct
10 Correct 18 ms 31980 KB Output is correct
11 Correct 18 ms 31980 KB Output is correct
12 Correct 19 ms 31980 KB Output is correct
13 Correct 18 ms 31980 KB Output is correct
14 Correct 18 ms 31980 KB Output is correct
15 Correct 17 ms 31980 KB Output is correct
16 Correct 18 ms 31980 KB Output is correct
17 Correct 18 ms 31980 KB Output is correct
18 Correct 18 ms 31980 KB Output is correct
19 Correct 17 ms 31980 KB Output is correct
20 Correct 17 ms 31980 KB Output is correct
21 Correct 21 ms 31980 KB Output is correct
22 Correct 21 ms 31980 KB Output is correct
23 Correct 22 ms 32000 KB Output is correct
24 Correct 50 ms 32108 KB Output is correct
25 Correct 49 ms 32108 KB Output is correct
26 Correct 51 ms 32108 KB Output is correct
27 Correct 52 ms 32108 KB Output is correct
28 Correct 34 ms 31980 KB Output is correct