oj.uz

Submission #329737

# Submission time Handle Problem Language Result Execution time Memory
329737 2020-11-22T09:38:39 Z GioChkhaidze Skyscraper (JOI16_skyscraper) C++14
100 / 100
 340 ms 5228 KB 
#include <bits/stdc++.h>

#define ll long long

using namespace std;

const int N=103;
const int L=1004;

ll mod=1e9+7;
ll dp[N][L][3];
ll dp_[N][L][3];
ll n,l,d,ans,a[N];

main () {
	cin>>n>>l;
	
	if (n==1) {
		cout<<1<<endl;
		return 0;
	}
	
	for (int i=1; i<=n; i++) 
		cin>>a[i];

	sort(a+1,a+n+1);
	
	a[n+1]=100000;
	dp_[0][0][0]=1;
	for (int i=2; i<=n+1; i++) {
		for (int cc=1; cc<=n; cc++) {
			for (int p=0; p<=l; p++) {
				d=(a[i]-a[i-1])*(2*cc);
				if (d<=p) {
					dp[cc][p][0]=(dp[cc][p][0]+dp_[cc-1][p-d][0]*cc)%mod;
					dp[cc][p][0]=(dp[cc][p][0]+dp_[cc][p-d][0]*2*cc)%mod;
					dp[cc][p][0]=(dp[cc][p][0]+dp_[cc+1][p-d][0]*cc)%mod;
				}
				
				d=(a[i]-a[i-1])*(2*cc-1);
				if (d<=p) {
					dp[cc][p][1]=(dp[cc][p][1]+dp_[cc][p-d][0]*2)%mod;
					dp[cc][p][1]=(dp[cc][p][1]+dp_[cc-1][p-d][0]*2)%mod;
					dp[cc][p][1]=(dp[cc][p][1]+dp_[cc-1][p-d][1]*(cc-1))%mod;
					dp[cc][p][1]=(dp[cc][p][1]+dp_[cc][p-d][1]*(2*cc-1))%mod;
					dp[cc][p][1]=(dp[cc][p][1]+dp_[cc+1][p-d][1]*cc)%mod;
				}
			
				d=(a[i]-a[i-1])*(2*cc-2);	
				if (d<=p) {
					dp[cc][p][2]=(dp[cc][p][2]+dp_[cc][p-d][1])%mod;
					dp[cc][p][2]=(dp[cc][p][2]+dp_[cc-1][p-d][1])%mod;
					dp[cc][p][2]=(dp[cc][p][2]+dp_[cc-1][p-d][2]*(cc-2))%mod;
					dp[cc][p][2]=(dp[cc][p][2]+dp_[cc][p-d][2]*(2*cc-2))%mod;
					dp[cc][p][2]=(dp[cc][p][2]+dp_[cc+1][p-d][2]*cc)%mod;
				}
						
				if (i==n+1 && cc==1) 
					ans=(ans+dp[cc][p][2])%mod;
			}
		}
		
		for (int cc=0; cc<=n; cc++) 
			for (int p=0; p<=l; p++) 
				for (int t=0; t<3; ++t)
					dp_[cc][p][t]=dp[cc][p][t],dp[cc][p][t]=0;
	}

	cout<<ans<<"\n";
}

Compilation message

skyscraper.cpp:15:7: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   15 | main () {
      |       ^

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 748 KB Output is correct
6 Correct 3 ms 748 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 3 ms 748 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 492 KB Output is correct
2 Correct 1 ms 492 KB Output is correct
3 Correct 1 ms 492 KB Output is correct
4 Correct 1 ms 620 KB Output is correct
5 Correct 1 ms 492 KB Output is correct
6 Correct 1 ms 492 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 1 ms 492 KB Output is correct
10 Correct 1 ms 492 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 364 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 1 ms 364 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 2 ms 748 KB Output is correct
6 Correct 3 ms 748 KB Output is correct
7 Correct 1 ms 492 KB Output is correct
8 Correct 1 ms 492 KB Output is correct
9 Correct 3 ms 748 KB Output is correct
10 Correct 1 ms 492 KB Output is correct
11 Correct 1 ms 492 KB Output is correct
12 Correct 1 ms 492 KB Output is correct
13 Correct 1 ms 492 KB Output is correct
14 Correct 1 ms 620 KB Output is correct
15 Correct 1 ms 492 KB Output is correct
16 Correct 1 ms 492 KB Output is correct
17 Correct 1 ms 492 KB Output is correct
18 Correct 1 ms 492 KB Output is correct
19 Correct 1 ms 492 KB Output is correct
20 Correct 1 ms 492 KB Output is correct
21 Correct 2 ms 748 KB Output is correct
22 Correct 332 ms 4068 KB Output is correct
23 Correct 329 ms 5100 KB Output is correct
24 Correct 299 ms 4716 KB Output is correct
25 Correct 338 ms 5228 KB Output is correct
26 Correct 304 ms 5100 KB Output is correct
27 Correct 112 ms 2412 KB Output is correct
28 Correct 153 ms 2668 KB Output is correct
29 Correct 292 ms 3948 KB Output is correct
30 Correct 340 ms 5228 KB Output is correct