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Submission #384236

# Submission time Handle Problem Language Result Execution time Memory
384236 2021-03-31T20:37:57 Z wind_reaper Watching (JOI13_watching) C++17
100 / 100
 263 ms 16108 KB 
#include <bits/stdc++.h>

using namespace std;
	
const int MXN = 2001;

int dp[MXN][MXN], a[MXN];

int n, p, q;

bool check(int w){
	memset(dp, 0, sizeof dp);

	for(int i = 1; i <= n; i++){
		int l = 1, r = 1;
		while(a[i] - a[l] >= w) l++;
		while(a[i] - a[r] >= 2*w) r++;

		for(int j = 0; j <= p; j++)
			if(j == 0) dp[i][j] = dp[r-1][j] + 1;
			else dp[i][j] = min(dp[l-1][j-1], dp[r-1][j] + 1);
	}

	return dp[n][p] <= q;
}

int32_t main(){
	ios_base::sync_with_stdio(false); 
	cin.tie(NULL); 
	
	cin >> n >> p >> q;
	for(int i = 1; i <= n; i++)
		cin >> a[i];
	p = min(p, n);
	sort(a+1, a+n+1);

	int lo = 1, hi = 1000000001;
	while(lo < hi){
		int mid = (lo + hi) >> 1;
		if(check(mid))
			hi = mid;
		else lo = mid + 1;
	}

	cout << lo << '\n';
	return 0; 
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 69 ms 15980 KB Output is correct
2 Correct 68 ms 15980 KB Output is correct
3 Correct 68 ms 16108 KB Output is correct
4 Correct 67 ms 15980 KB Output is correct
5 Correct 68 ms 16108 KB Output is correct
6 Correct 69 ms 15980 KB Output is correct
7 Correct 68 ms 15980 KB Output is correct
8 Correct 71 ms 15980 KB Output is correct
9 Correct 70 ms 15980 KB Output is correct
10 Correct 68 ms 15980 KB Output is correct
11 Correct 70 ms 15980 KB Output is correct
12 Correct 70 ms 15980 KB Output is correct
13 Correct 70 ms 15980 KB Output is correct
14 Correct 71 ms 15980 KB Output is correct
15 Correct 69 ms 15980 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 86 ms 16000 KB Output is correct
2 Correct 69 ms 16108 KB Output is correct
3 Correct 228 ms 16108 KB Output is correct
4 Correct 263 ms 16108 KB Output is correct
5 Correct 127 ms 16108 KB Output is correct
6 Correct 263 ms 15980 KB Output is correct
7 Correct 113 ms 15980 KB Output is correct
8 Correct 130 ms 15980 KB Output is correct
9 Correct 176 ms 15980 KB Output is correct
10 Correct 256 ms 16108 KB Output is correct
11 Correct 136 ms 15980 KB Output is correct
12 Correct 206 ms 15980 KB Output is correct
13 Correct 108 ms 15980 KB Output is correct
14 Correct 115 ms 15980 KB Output is correct
15 Correct 119 ms 16092 KB Output is correct