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Submission #379552

# Submission time Handle Problem Language Result Execution time Memory
379552 2021-03-18T14:37:55 Z penguin133 Watching (JOI13_watching) C++14
100 / 100
 250 ms 16236 KB 
#include <bits/stdc++.h>
using namespace std;
int n,p,q,s = 1, e= 1e9 + 5, ans = 1e9 + 5;
int dp[2005][2005], A[2005];
bool c(int x){
	for(int i=1;i<=n;i++){
		int l = 1, r = 1;
		while(A[i] - A[l] >= x)l++;
		while(A[i] - A[r] >= 2*x)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;
}
int main(){
	cin >> n >> p >> q;
	for(int i=1;i<=n;i++)cin >> A[i];
	if(p + q >= n){
		cout << 1;
		exit(0);
	}
	sort(A+1, A+n+1);
	while(s <= e){
		int m = (s + e)/2;
		memset(dp, 0, sizeof(dp));
		if(c(m)){
			ans = m;
			e = m - 1;
		}
		else s = m + 1;
	}
	cout << ans;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 69 ms 16236 KB Output is correct
2 Correct 1 ms 364 KB Output is correct
3 Correct 69 ms 16108 KB Output is correct
4 Correct 1 ms 364 KB Output is correct
5 Correct 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 70 ms 16108 KB Output is correct
8 Correct 67 ms 16108 KB Output is correct
9 Correct 68 ms 16108 KB Output is correct
10 Correct 67 ms 16108 KB Output is correct
11 Correct 69 ms 16108 KB Output is correct
12 Correct 69 ms 16108 KB Output is correct
13 Correct 69 ms 16108 KB Output is correct
14 Correct 66 ms 16108 KB Output is correct
15 Correct 67 ms 16108 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 87 ms 16108 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 1 ms 364 KB Output is correct
6 Correct 1 ms 364 KB Output is correct
7 Correct 118 ms 16108 KB Output is correct
8 Correct 150 ms 16108 KB Output is correct
9 Correct 180 ms 16108 KB Output is correct
10 Correct 250 ms 16108 KB Output is correct
11 Correct 133 ms 16236 KB Output is correct
12 Correct 195 ms 16128 KB Output is correct
13 Correct 112 ms 16236 KB Output is correct
14 Correct 118 ms 16108 KB Output is correct
15 Correct 118 ms 16108 KB Output is correct