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Submission #966418

# Submission time Handle Problem Language Result Execution time Memory
966418 2024-04-19T20:28:28 Z vjudge1 Kangaroo (CEOI16_kangaroo) C++17
100 / 100
 13 ms 31584 KB 
// In the name of Almighty Allah.
// We're nothing and you're everything.
// Allahu Akbar

#include <bits/stdc++.h>
using namespace std;

#define PI acos(-1.0)
#define FAST_IO ios_base::sync_with_stdio(0);cin.tie(0);
typedef long long ll;
typedef pair<int,int> pii;
typedef tuple<int,int,int> tii;

const int N = 2e3+5;
const ll mod = 1e9+7;

ll dp[N][N];

void solve(int tc){
	ll i,j,k,n,m,x,y,s,f,l;
	cin >> n >> s >> f;
	for(i=1;i<=n;i++){
		for(j=1;j<=i;j++){
			if(i == 1 && j == 1) dp[i][j] = 1;
			else if(i == s || i == f){
				dp[i][j] = dp[i-1][j-1] + dp[i-1][j];
			}
			else{
				x = j;
				if(i>s) x--;
				if(i>f) x--;
				dp[i][j] = dp[i-1][j+1]*j + dp[i-1][j-1]*x;
			}
			dp[i][j] %= mod;
		}
	}
	cout << dp[n][1] << "\n";
}

int main(){
	FAST_IO
	int t = 1;
	//cin >> t;
	for(int tc = 1;tc<=t;tc++){
		solve(tc);
	}
return 0;		
}

Compilation message

kangaroo.cpp: In function 'void solve(int)':
kangaroo.cpp:20:9: warning: unused variable 'k' [-Wunused-variable]
   20 |  ll i,j,k,n,m,x,y,s,f,l;
      |         ^
kangaroo.cpp:20:13: warning: unused variable 'm' [-Wunused-variable]
   20 |  ll i,j,k,n,m,x,y,s,f,l;
      |             ^
kangaroo.cpp:20:17: warning: unused variable 'y' [-Wunused-variable]
   20 |  ll i,j,k,n,m,x,y,s,f,l;
      |                 ^
kangaroo.cpp:20:23: warning: unused variable 'l' [-Wunused-variable]
   20 |  ll i,j,k,n,m,x,y,s,f,l;
      |                       ^

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4440 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4444 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4696 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct

Subtask #4
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 2392 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2648 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4440 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct
16 Correct 1 ms 4444 KB Output is correct
17 Correct 1 ms 4444 KB Output is correct
18 Correct 1 ms 4696 KB Output is correct
19 Correct 1 ms 4444 KB Output is correct
20 Correct 1 ms 4444 KB Output is correct
21 Correct 2 ms 10588 KB Output is correct
22 Correct 2 ms 12636 KB Output is correct
23 Correct 2 ms 12636 KB Output is correct
24 Correct 13 ms 31516 KB Output is correct
25 Correct 10 ms 31584 KB Output is correct
26 Correct 10 ms 31580 KB Output is correct
27 Correct 10 ms 31580 KB Output is correct
28 Correct 6 ms 24924 KB Output is correct