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Submission #506236

# Submission time Handle Problem Language Result Execution time Memory
506236 2022-01-11T23:10:26 Z rodov Kangaroo (CEOI16_kangaroo) C++14
100 / 100
 30 ms 24012 KB 
#include <bits/stdc++.h>

using namespace std;
long long n,s,f,k;
long long d[5007][5007];
const long long MOD = 1000000007;
int main() {
    cin >> n >> s >> f;
    d[1][1] = 1;
    for(int i=2; i<=n; i++)
        for(int j=1; j<=i; j++) {
            if(i==s || i==f) d[i][j] = (d[i-1][j-1]+d[i-1][j])%MOD;
            else {
                k = j;
                if(i>s) k--;
                if(i>f) k--;
                //if(k<0) cout << k << endl;
                d[i][j] = (d[i-1][j+1]*j + d[i-1][j-1]*k) % MOD;
            }
        }
    cout << d[n][1] << endl;
    /*
    cin >> n;
    d[1][1] = 1;
    for(int i=2; i<=n; i++)
        for(int j=1; j<=i; j++)
            d[i][j] = d[i-1][j]*(2*j) + d[i-1][j-1]*j  + d[i-1][j+1]*j;
    cout << d[n][1] << endl;
    */
    return 0;
}

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 424 KB Output is correct
5 Correct 0 ms 460 KB Output is correct
6 Correct 0 ms 460 KB Output is correct
7 Correct 1 ms 460 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 432 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 424 KB Output is correct
5 Correct 0 ms 460 KB Output is correct
6 Correct 0 ms 460 KB Output is correct
7 Correct 1 ms 460 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 432 KB Output is correct
12 Correct 1 ms 1228 KB Output is correct
13 Correct 1 ms 1100 KB Output is correct
14 Correct 1 ms 1228 KB Output is correct
15 Correct 1 ms 1228 KB Output is correct
16 Correct 1 ms 1184 KB Output is correct
17 Correct 1 ms 1228 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 1 ms 1228 KB Output is correct
20 Correct 1 ms 1228 KB Output is correct

Subtask #4
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 332 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 0 ms 332 KB Output is correct
4 Correct 0 ms 424 KB Output is correct
5 Correct 0 ms 460 KB Output is correct
6 Correct 0 ms 460 KB Output is correct
7 Correct 1 ms 460 KB Output is correct
8 Correct 1 ms 460 KB Output is correct
9 Correct 1 ms 460 KB Output is correct
10 Correct 1 ms 460 KB Output is correct
11 Correct 1 ms 432 KB Output is correct
12 Correct 1 ms 1228 KB Output is correct
13 Correct 1 ms 1100 KB Output is correct
14 Correct 1 ms 1228 KB Output is correct
15 Correct 1 ms 1228 KB Output is correct
16 Correct 1 ms 1184 KB Output is correct
17 Correct 1 ms 1228 KB Output is correct
18 Correct 1 ms 1100 KB Output is correct
19 Correct 1 ms 1228 KB Output is correct
20 Correct 1 ms 1228 KB Output is correct
21 Correct 2 ms 4552 KB Output is correct
22 Correct 4 ms 5068 KB Output is correct
23 Correct 3 ms 5580 KB Output is correct
24 Correct 15 ms 23960 KB Output is correct
25 Correct 15 ms 24012 KB Output is correct
26 Correct 15 ms 23996 KB Output is correct
27 Correct 30 ms 23844 KB Output is correct
28 Correct 9 ms 15128 KB Output is correct