oj.uz

Submission #316417

# Submission time Handle Problem Language Result Execution time Memory
316417 2020-10-26T10:10:08 Z vipghn2003 Skyscraper (JOI16_skyscraper) C++14
100 / 100
 571 ms 363000 KB 
#include<bits/stdc++.h>
#define int long long
using namespace std;

const int N=105;
const int mod=1e9+7;

int n,L,a[N],b[N];
int dp[N][N][2][2][N*10];

int calc(int i,int cnt,bool haveL,bool haveR,int val)
{
   if(i) val+=a[i-1]*(2*cnt-haveL-haveR);
   if(val>L) return 0;
   int &res=dp[i][cnt][haveL][haveR][val];
   if(res!=-1) return res;
   if(i==n)
   {
      if(val>L||cnt!=1||!haveL||!haveR) return 0;
      return 1;
   }
   res=0;
   ///new comp
   (res+=calc(i+1,cnt+1,haveL,haveR,val)*(cnt+1-haveL-haveR)%mod)%=mod;
   ///new L
   if(!haveL) (res+=calc(i+1,cnt+1,1,haveR,val))%=mod;
   ///new R
   if(!haveR) (res+=calc(i+1,cnt+1,haveL,1,val))%=mod;
   if(cnt)
   {
       ///merge
       if(cnt>=2) (res+=calc(i+1,cnt-1,haveL,haveR,val)*(cnt-1)%mod)%=mod;
       ///push front
       (res+=calc(i+1,cnt,haveL,haveR,val)*(cnt-haveL)%mod)%=mod;
       ///push back
       (res+=calc(i+1,cnt,haveL,haveR,val)*(cnt-haveR)%mod)%=mod;
       ///made L
       if(!haveL) (res+=calc(i+1,cnt,1,haveR,val))%=mod;
       ///made R
       if(!haveR) (res+=calc(i+1,cnt,haveL,1,val))%=mod;
   }
   //cout<<i<<' '<<cnt<<' '<<haveL<<' '<<haveR<<' '<<val<<'\n' ;
   return res;
}

main()
{
   ios_base::sync_with_stdio(false);
   cin.tie(nullptr);
   memset(dp,-1,sizeof dp);
   cin>>n>>L;
   if(n==1) return cout<<1,0;
   for(int i=0;i<n;i++) cin>>b[i];
   sort(b,b+n);
   for(int i=0;i<n;i++) a[i]=b[i+1]-b[i];
   cout<<calc(0,0,0,0,0);
}

Compilation message

skyscraper.cpp:46:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   46 | main()
      |      ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 202 ms 362848 KB Output is correct
2 Correct 199 ms 362876 KB Output is correct
3 Correct 195 ms 362744 KB Output is correct
4 Correct 197 ms 362744 KB Output is correct
5 Correct 197 ms 362872 KB Output is correct
6 Correct 196 ms 362820 KB Output is correct
7 Correct 195 ms 362744 KB Output is correct
8 Correct 198 ms 362872 KB Output is correct
9 Correct 195 ms 362744 KB Output is correct
10 Correct 196 ms 362744 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 200 ms 362740 KB Output is correct
2 Correct 212 ms 362748 KB Output is correct
3 Correct 203 ms 362872 KB Output is correct
4 Correct 199 ms 362760 KB Output is correct
5 Correct 197 ms 362744 KB Output is correct
6 Correct 201 ms 362808 KB Output is correct
7 Correct 200 ms 362872 KB Output is correct
8 Correct 200 ms 362868 KB Output is correct
9 Correct 197 ms 362744 KB Output is correct
10 Correct 197 ms 362872 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 202 ms 362848 KB Output is correct
2 Correct 199 ms 362876 KB Output is correct
3 Correct 195 ms 362744 KB Output is correct
4 Correct 197 ms 362744 KB Output is correct
5 Correct 197 ms 362872 KB Output is correct
6 Correct 196 ms 362820 KB Output is correct
7 Correct 195 ms 362744 KB Output is correct
8 Correct 198 ms 362872 KB Output is correct
9 Correct 195 ms 362744 KB Output is correct
10 Correct 196 ms 362744 KB Output is correct
11 Correct 200 ms 362740 KB Output is correct
12 Correct 212 ms 362748 KB Output is correct
13 Correct 203 ms 362872 KB Output is correct
14 Correct 199 ms 362760 KB Output is correct
15 Correct 197 ms 362744 KB Output is correct
16 Correct 201 ms 362808 KB Output is correct
17 Correct 200 ms 362872 KB Output is correct
18 Correct 200 ms 362868 KB Output is correct
19 Correct 197 ms 362744 KB Output is correct
20 Correct 197 ms 362872 KB Output is correct
21 Correct 199 ms 362744 KB Output is correct
22 Correct 571 ms 362744 KB Output is correct
23 Correct 292 ms 362744 KB Output is correct
24 Correct 341 ms 362744 KB Output is correct
25 Correct 317 ms 362800 KB Output is correct
26 Correct 307 ms 362744 KB Output is correct
27 Correct 271 ms 362784 KB Output is correct
28 Correct 308 ms 363000 KB Output is correct
29 Correct 423 ms 362872 KB Output is correct
30 Correct 313 ms 362872 KB Output is correct