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Submission #707952

# Submission time Handle Problem Language Result Execution time Memory
707952 2023-03-10T15:01:30 Z Dan4Life Watching (JOI13_watching) C++17
100 / 100
 278 ms 16100 KB 
#include <bits/stdc++.h>
using namespace std;
const int mxN = (int)2e3+10, LINF = (int)1e9;
int n, p, q, a[mxN], P[mxN], Q[mxN], dp[mxN][mxN];
 
bool work(int w){
	for(int i=2,j=1,k=1; i <= n; i++){
		while(a[i]-a[j]+1>w) j++;
		while(a[i]-a[k]+1>2*w) k++;
		P[i]=j-1,Q[i]=k-1;
	}
	for(int i = 1; i <= n; i++){
		for(int j = 0; j <= q; j++){
			dp[i][j] = min(LINF, dp[P[i]][j]+1);
			if(j) dp[i][j] = min(dp[i][j], dp[Q[i]][j-1]);
		}
	}
	return dp[n][q]<=p;
}
 
int32_t 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 l = 1, r = (int)1e9;
	while(l<r){
		int mid = (l+r)/2;
		if(work(mid)) r=mid;
		else l=mid+1;
	}
	cout << l;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 1 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 8380 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 6 ms 8404 KB Output is correct
8 Correct 111 ms 14228 KB Output is correct
9 Correct 22 ms 9344 KB Output is correct
10 Correct 17 ms 9068 KB Output is correct
11 Correct 278 ms 16084 KB Output is correct
12 Correct 139 ms 16100 KB Output is correct
13 Correct 7 ms 8404 KB Output is correct
14 Correct 6 ms 8400 KB Output is correct
15 Correct 7 ms 8404 KB Output is correct