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Submission #314364

# Submission time Handle Problem Language Result Execution time Memory
314364 2020-10-19T18:40:43 Z ivan_tudor Kangaroo (CEOI16_kangaroo) C++14
100 / 100
 22 ms 14080 KB 
#include<bits/stdc++.h>
using namespace std;
const int N=2005;
const int MOD=1000000007;
int dp[N][N];
inline void trans(long long val,int id,int col){
  if(col<0)
    return;
  val%=MOD;
  dp[id][col]+=val;
  if(dp[id][col]>MOD)
    dp[id][col]-=MOD;
}
int main()
{
  int n,cs,cf;
  scanf("%d%d%d",&n,&cs,&cf);
  if(cf<cs)
    swap(cf,cs);
  dp[1][0]=1;
  for(int i=1;i<cs;i++){
    for(int j=0;j<i;j++){
      trans(dp[i][j],i+1,j+1);
      trans(1LL*dp[i][j]*(j-1)*j,i+1,j-1);
    }
  }
  for(int j=0;j<cs;j++){
    trans(dp[cs][j],cs+1,j);
    trans(1LL*dp[cs][j]*j,cs+1,j-1);
  }
  for(int i=cs+1;i<cf;i++){
    for(int j=0;j<i;j++){
      trans(dp[i][j],i+1,j+1);
      trans(1LL*dp[i][j]*(j)*j,i+1,j-1);
    }
  }
  for(int j=0;j<cf;j++){
    trans(dp[cf][j],cf+1,j);
    trans(1LL*dp[cf][j]*j,cf+1,j-1);
  }
  for(int i=cf+1;i<=n;i++){
    for(int j=0;j<i;j++){
      trans(dp[i][j],i+1,j+1);
      trans(1LL*dp[i][j]*(j+1)*j,i+1,j-1);
    }
  }
  printf("%d",dp[n][0]);
  return 0;
}

Compilation message

kangaroo.cpp: In function 'int main()':
kangaroo.cpp:17:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   17 |   scanf("%d%d%d",&n,&cs,&cf);
      |   ~~~~~^~~~~~~~~~~~~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct

Subtask #2
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 1 ms 512 KB Output is correct
7 Correct 1 ms 512 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 512 KB Output is correct
10 Correct 1 ms 512 KB Output is correct
11 Correct 1 ms 512 KB Output is correct

Subtask #3
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 1 ms 512 KB Output is correct
7 Correct 1 ms 512 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 512 KB Output is correct
10 Correct 1 ms 512 KB Output is correct
11 Correct 1 ms 512 KB Output is correct
12 Correct 1 ms 1152 KB Output is correct
13 Correct 1 ms 1148 KB Output is correct
14 Correct 1 ms 1152 KB Output is correct
15 Correct 1 ms 1152 KB Output is correct
16 Correct 1 ms 1152 KB Output is correct
17 Correct 2 ms 1152 KB Output is correct
18 Correct 1 ms 1152 KB Output is correct
19 Correct 1 ms 1152 KB Output is correct
20 Correct 1 ms 1152 KB Output is correct

Subtask #4
49.0 / 49.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 512 KB Output is correct
5 Correct 1 ms 512 KB Output is correct
6 Correct 1 ms 512 KB Output is correct
7 Correct 1 ms 512 KB Output is correct
8 Correct 1 ms 512 KB Output is correct
9 Correct 1 ms 512 KB Output is correct
10 Correct 1 ms 512 KB Output is correct
11 Correct 1 ms 512 KB Output is correct
12 Correct 1 ms 1152 KB Output is correct
13 Correct 1 ms 1148 KB Output is correct
14 Correct 1 ms 1152 KB Output is correct
15 Correct 1 ms 1152 KB Output is correct
16 Correct 1 ms 1152 KB Output is correct
17 Correct 2 ms 1152 KB Output is correct
18 Correct 1 ms 1152 KB Output is correct
19 Correct 1 ms 1152 KB Output is correct
20 Correct 1 ms 1152 KB Output is correct
21 Correct 4 ms 3840 KB Output is correct
22 Correct 6 ms 4096 KB Output is correct
23 Correct 5 ms 4480 KB Output is correct
24 Correct 22 ms 14080 KB Output is correct
25 Correct 22 ms 14072 KB Output is correct
26 Correct 22 ms 14072 KB Output is correct
27 Correct 21 ms 14080 KB Output is correct
28 Correct 14 ms 10240 KB Output is correct