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QOJ
ID | Problem | Submitter | Result | Time | Memory | Language | File size | Submit time | Judge time |
---|---|---|---|---|---|---|---|---|---|
#275851 | #6410. Classical DP Problem | wangqingxian | Compile Error | / | / | C++14 | 782b | 2023-12-05 10:00:16 | 2023-12-05 10:00:17 |
Judging History
answer
#include<iostream>
#define For(i,l,r) for(int i=(l);i<=(r);++i)
#define mem0(a) memset(a,0,sizeof(a))
#define int long long
using namespace std;
const int N=5e3+10,mod=998244353;
int n,a[N],k,f[N][N],g[N],tim=1,ans=0,temp[N];
void dp(){
For(i,1,n)k=max(k,min(a[i],i));
int t=a[k+1];
f[0][0]=1;
For(i,1,k)
For(j,0,t){
if(j)f[i][j]=f[i-1][j-1]*(t-j+1)%mod;
f[i][j]=(f[i][j]+f[i-1][j]*(a[i]-(t-j))%mod)%mod;
}
ans+=f[k][t];
}
signed main(){
cin>>n;
For(i,1,n){cin>>a[i];temp[i]=a[i];}
reverse(a+1,a+1+n);
dp();mem0(a);
For(i,1,temp[n])For(j,1,n)if(temp[j]>=i) a[i]++;
mem0(f);dp();
For(i,1,k)tim=tim*i%mod;
cout<<k<<" "<<(ans-tim+mod)%mod<<endl;
return 0;
}
Details
answer.code: In function ‘int main()’: answer.code:22:5: error: ‘reverse’ was not declared in this scope 22 | reverse(a+1,a+1+n); | ^~~~~~~ answer.code:3:17: error: ‘memset’ was not declared in this scope 3 | #define mem0(a) memset(a,0,sizeof(a)) | ^~~~~~ answer.code:23:10: note: in expansion of macro ‘mem0’ 23 | dp();mem0(a); | ^~~~ answer.code:2:1: note: ‘memset’ is defined in header ‘<cstring>’; did you forget to ‘#include <cstring>’? 1 | #include<iostream> +++ |+#include <cstring> 2 | #define For(i,l,r) for(int i=(l);i<=(r);++i)