oj.uz

Submission #601708

# Submission time Handle Problem Language Result Execution time Memory
601708 2022-07-22T09:21:28 Z 1bin Skyscraper (JOI16_skyscraper) C++14
100 / 100
 319 ms 190528 KB 
#include <bits/stdc++.h>
 
using namespace std ;
 
const int mod = 1e9 + 7 ;
 
int Add(int x , int y)
{
	int z = x + y ;
	if(z >= mod)
		z -= mod ;
	return z ;
}
 
int Sub(int x , int y)
{
	int z = x - y ;
	if(z < 0)
		z += mod ;
	return z ;
}
 
int Mul(int x , int y)
{
	return (1ll * x * y) % mod ;
}
 
const int MAX = 100 + 10 ;
 
int arr[MAX] ;
int n , l ;
 
int dp[MAX][MAX][1004][2][2] ;
 
int solve(int idx , int cnt , int sum , bool t1 , bool t2)
{
	if(idx > 0 && idx < n)
		sum += (2*cnt - t1 - t2) * (arr[idx] - arr[idx-1]) ;
	if(sum > l)
		return 0 ;
	if(idx == n)
		return (cnt == 1 && t1 && t2) ;
	int &ret = dp[idx][cnt][sum][t1][t2] ;
	if(ret != -1)
		return ret ;
	ret = 0 ;
	ret = Add(ret , Mul(solve(idx+1 , cnt+1 , sum , t1 , t2) , cnt+1-t1-t2)) ;
	if(!t1)
		ret = Add(ret , solve(idx+1 , cnt+1 , sum , 1 , t2)) ;
	if(!t2)
		ret = Add(ret , solve(idx+1 , cnt+1 , sum , t1 , 1)) ;
	if(cnt >= 2)
		ret = Add(ret , Mul(solve(idx+1 , cnt-1 , sum , t1 , t2) , cnt-1)) ;
	if(cnt)
	{
		ret = Add(ret , Mul(solve(idx+1 , cnt , sum , t1 , t2) , 2 * cnt - t1 - t2)) ;
		if(!t1)
			ret = Add(ret , solve(idx+1 , cnt , sum , 1 , t2)) ;
		if(!t2)
			ret = Add(ret , solve(idx+1 , cnt , sum , t1 , 1)) ;
	}
	return ret ;
}
 
int main()
{
	memset(dp , -1 , sizeof(dp)) ;
	ios_base::sync_with_stdio(0) ;
	cin.tie(0) ;
	cin>>n>>l ;
	for(int i = 0 ; i < n ; ++i)
		cin>>arr[i] ;
	sort(arr , arr + n) ;
	if(n == 1)
		return cout<<1<<"\n" , 0 ;
	return cout<<solve(0 , 0 , 0 , 0 , 0)<<"\n" , 0 ;
}

Subtask #1
5.0 / 5.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 190492 KB Output is correct
2 Correct 104 ms 190496 KB Output is correct
3 Correct 106 ms 190444 KB Output is correct
4 Correct 94 ms 190436 KB Output is correct
5 Correct 100 ms 190388 KB Output is correct
6 Correct 102 ms 190424 KB Output is correct
7 Correct 106 ms 190488 KB Output is correct
8 Correct 93 ms 190448 KB Output is correct
9 Correct 113 ms 190388 KB Output is correct
10 Correct 105 ms 190428 KB Output is correct

Subtask #2
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 190428 KB Output is correct
2 Correct 90 ms 190444 KB Output is correct
3 Correct 98 ms 190432 KB Output is correct
4 Correct 77 ms 190428 KB Output is correct
5 Correct 100 ms 190492 KB Output is correct
6 Correct 108 ms 190472 KB Output is correct
7 Correct 104 ms 190392 KB Output is correct
8 Correct 113 ms 190492 KB Output is correct
9 Correct 96 ms 190520 KB Output is correct
10 Correct 92 ms 190416 KB Output is correct

Subtask #3
80.0 / 80.0

# Verdict Execution time Memory Grader output
1 Correct 99 ms 190492 KB Output is correct
2 Correct 104 ms 190496 KB Output is correct
3 Correct 106 ms 190444 KB Output is correct
4 Correct 94 ms 190436 KB Output is correct
5 Correct 100 ms 190388 KB Output is correct
6 Correct 102 ms 190424 KB Output is correct
7 Correct 106 ms 190488 KB Output is correct
8 Correct 93 ms 190448 KB Output is correct
9 Correct 113 ms 190388 KB Output is correct
10 Correct 105 ms 190428 KB Output is correct
11 Correct 99 ms 190428 KB Output is correct
12 Correct 90 ms 190444 KB Output is correct
13 Correct 98 ms 190432 KB Output is correct
14 Correct 77 ms 190428 KB Output is correct
15 Correct 100 ms 190492 KB Output is correct
16 Correct 108 ms 190472 KB Output is correct
17 Correct 104 ms 190392 KB Output is correct
18 Correct 113 ms 190492 KB Output is correct
19 Correct 96 ms 190520 KB Output is correct
20 Correct 92 ms 190416 KB Output is correct
21 Correct 108 ms 190492 KB Output is correct
22 Correct 319 ms 190500 KB Output is correct
23 Correct 146 ms 190412 KB Output is correct
24 Correct 183 ms 190528 KB Output is correct
25 Correct 209 ms 190392 KB Output is correct
26 Correct 192 ms 190500 KB Output is correct
27 Correct 160 ms 190528 KB Output is correct
28 Correct 164 ms 190500 KB Output is correct
29 Correct 220 ms 190520 KB Output is correct
30 Correct 232 ms 190496 KB Output is correct