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Submission #1116880

# Submission time Handle Problem Language Result Execution time Memory
1116880 2024-11-22T14:01:32 Z byebye75 Ruins 3 (JOI20_ruins3) C++14
100 / 100
 271 ms 13568 KB 
#include <iostream>

const long long M=605,mod=1e9+7;
int n,a[M];
long long C[2*M][2*M],F[M],dp[M][M];

int main(){
	C[0][0]=F[0]=dp[0][0]=1;
	for(int i=0;i<2*M-1;i++) for(int j=0;j<=i;j++){
		(C[i+1][j]+=C[i][j])%=mod;
		(C[i+1][j+1]+=C[i][j])%=mod;
	}
	for(int i=1;i<M;i++) F[i]=F[i-1]*i%mod;
	scanf("%d",&n);
	for(int i=0;i<n;i++) scanf("%d",a+i);
	for(int i=0;i<n;i++) for(int j=0;j<=n;j++) if(dp[i][j]) for(int k=0;k<=std::min(n,a[i]-i-1)-j;k++){
		(dp[i+1][j+k]+=dp[i][j]*C[2*k][k]%mod*C[a[i]-i-j-1][k]%mod*F[k]%mod*(k?1:j-i))%=mod;
	}
	long long res=dp[n][n];
	for(int i=0;i<n;i++) (res*=mod/2+1)%=mod;
	printf("%lld\n",res);
}

Compilation message

ruins3.cpp: In function 'int main()':
ruins3.cpp:14:7: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |  scanf("%d",&n);
      |  ~~~~~^~~~~~~~~
ruins3.cpp:15:28: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
   15 |  for(int i=0;i<n;i++) scanf("%d",a+i);
      |                       ~~~~~^~~~~~~~~~

Subtask #1
6.0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11344 KB Output is correct
2 Correct 9 ms 11344 KB Output is correct
3 Correct 8 ms 11344 KB Output is correct
4 Correct 9 ms 11344 KB Output is correct
5 Correct 9 ms 11344 KB Output is correct
6 Correct 9 ms 11344 KB Output is correct
7 Correct 9 ms 11344 KB Output is correct
8 Correct 10 ms 11344 KB Output is correct
9 Correct 9 ms 11344 KB Output is correct
10 Correct 8 ms 11220 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11344 KB Output is correct
2 Correct 9 ms 11344 KB Output is correct
3 Correct 8 ms 11344 KB Output is correct
4 Correct 9 ms 11344 KB Output is correct
5 Correct 9 ms 11344 KB Output is correct
6 Correct 9 ms 11344 KB Output is correct
7 Correct 9 ms 11344 KB Output is correct
8 Correct 10 ms 11344 KB Output is correct
9 Correct 9 ms 11344 KB Output is correct
10 Correct 8 ms 11220 KB Output is correct
11 Correct 9 ms 11600 KB Output is correct
12 Correct 9 ms 11600 KB Output is correct
13 Correct 9 ms 11772 KB Output is correct
14 Correct 9 ms 11420 KB Output is correct
15 Correct 9 ms 11344 KB Output is correct
16 Correct 9 ms 11588 KB Output is correct
17 Correct 9 ms 11344 KB Output is correct
18 Correct 9 ms 11600 KB Output is correct
19 Correct 9 ms 11600 KB Output is correct
20 Correct 9 ms 11600 KB Output is correct

Subtask #3
42.0 / 42.0

# Verdict Execution time Memory Grader output
1 Correct 9 ms 11344 KB Output is correct
2 Correct 9 ms 11344 KB Output is correct
3 Correct 8 ms 11344 KB Output is correct
4 Correct 9 ms 11344 KB Output is correct
5 Correct 9 ms 11344 KB Output is correct
6 Correct 9 ms 11344 KB Output is correct
7 Correct 9 ms 11344 KB Output is correct
8 Correct 10 ms 11344 KB Output is correct
9 Correct 9 ms 11344 KB Output is correct
10 Correct 8 ms 11220 KB Output is correct
11 Correct 9 ms 11600 KB Output is correct
12 Correct 9 ms 11600 KB Output is correct
13 Correct 9 ms 11772 KB Output is correct
14 Correct 9 ms 11420 KB Output is correct
15 Correct 9 ms 11344 KB Output is correct
16 Correct 9 ms 11588 KB Output is correct
17 Correct 9 ms 11344 KB Output is correct
18 Correct 9 ms 11600 KB Output is correct
19 Correct 9 ms 11600 KB Output is correct
20 Correct 9 ms 11600 KB Output is correct
21 Correct 11 ms 13136 KB Output is correct
22 Correct 11 ms 13136 KB Output is correct
23 Correct 11 ms 13264 KB Output is correct
24 Correct 13 ms 13144 KB Output is correct
25 Correct 9 ms 11360 KB Output is correct
26 Correct 9 ms 11344 KB Output is correct
27 Correct 9 ms 11344 KB Output is correct
28 Correct 10 ms 13196 KB Output is correct
29 Correct 9 ms 11344 KB Output is correct
30 Correct 271 ms 13556 KB Output is correct
31 Correct 150 ms 13384 KB Output is correct
32 Correct 209 ms 13568 KB Output is correct
33 Correct 249 ms 13384 KB Output is correct
34 Correct 143 ms 13384 KB Output is correct
35 Correct 205 ms 13476 KB Output is correct
36 Correct 246 ms 13384 KB Output is correct