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Submission #1058735

# Submission time Handle Problem Language Result Execution time Memory
1058735 2024-08-14T13:06:21 Z ZeroCool Watching (JOI13_watching) C++14
100 / 100
 181 ms 47760 KB 
#include <bits/stdc++.h>

using namespace std;

#define ar array
#define int long long
#define ld long double
#define crash assert(69 == 420)

const int MOD = 1e9 + 7;
const int INF = 1e9;

const int N = 3000;
const int K = 300;
const int LOG = 30;

int n, p, q;

int A[N];
int dp[N][N];

bool check(int x){
	for(int i = 1;i <= n;i++){
		for(int j = 0;j <= p;j++){
			dp[i][j] = INF;
		}
	}
	for(int i = 1;i <= n;i++){
		int l = upper_bound(A + 1,A + n + 1, A[i] - x) - A;
		int r = upper_bound(A + 1, A + n + 1, A[i] - 2 * x) - A;
		for(int j = 0;j <= p;j++){
			if(j)dp[i][j] = min(dp[i][j], dp[l - 1][j - 1]);
			dp[i][j] = min(dp[i][j], dp[r - 1][j] + 1);
		}
	}
	for(int i = 0;i <= p;i++){
		if(dp[n][i] <= q)return 1;
	}
	return 0;
}

signed main(){ios_base::sync_with_stdio(false);cin.tie(0);
	cin>>n>>p>>q;
	for(int i =1 ;i <= n;i++)cin>>A[i];
	sort(A + 1, A + n  + 1);
	
	if(p + q >= n){
		cout<<1;
		return 0;
	}
	
	int ans = (1 << LOG) - 1;
	int tm = 1 << (LOG - 1);
	for(int i =0;i < LOG;i++){
		if(check(tm)){
			ans = tm;
			tm -= (tm & -tm) >> 1;
		}else tm += (tm & -tm)>>1;
	}
	cout<<ans;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 4444 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 2396 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 4444 KB Output is correct
8 Correct 1 ms 4444 KB Output is correct
9 Correct 1 ms 4444 KB Output is correct
10 Correct 1 ms 4444 KB Output is correct
11 Correct 1 ms 4444 KB Output is correct
12 Correct 1 ms 4444 KB Output is correct
13 Correct 1 ms 4444 KB Output is correct
14 Correct 1 ms 4444 KB Output is correct
15 Correct 1 ms 4444 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 47708 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 7 ms 47708 KB Output is correct
8 Correct 18 ms 47736 KB Output is correct
9 Correct 73 ms 47708 KB Output is correct
10 Correct 181 ms 47708 KB Output is correct
11 Correct 15 ms 47708 KB Output is correct
12 Correct 89 ms 47760 KB Output is correct
13 Correct 8 ms 47708 KB Output is correct
14 Correct 9 ms 47724 KB Output is correct
15 Correct 9 ms 47708 KB Output is correct