Submission #707939

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
707939	2023-03-10T14:30:16 Z	Dan4Life	Watching (JOI13_watching)	C++17	100 / 100	302 ms	16140 KB

watching

#include <bits/stdc++.h>
using namespace std;
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
const int mxN = (int)2e3+10;
const int LINF = (int)1e9;
int n, p, q;
int a[mxN], P[mxN], Q[mxN], v[mxN], dp[mxN][mxN];

bool work(int w){
	for(int i = 2; i <= n; i++){
		v[i]=v[i-1]+a[i]-a[i-1];
		for(int j = i; j; j--){
			if(v[i]-v[j]+1<=w) P[i]=j-1;
			if(v[i]-v[j]+1<=2*w) Q[i]=j-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); v[1]=a[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	0 ms	212 KB	Output is correct
3	Correct	0 ms	340 KB	Output is correct
4	Correct	1 ms	212 KB	Output is correct
5	Correct	0 ms	212 KB	Output is correct
6	Correct	0 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	772 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	53 ms	8368 KB	Output is correct
2	Correct	0 ms	212 KB	Output is correct
3	Correct	1 ms	340 KB	Output is correct
4	Correct	1 ms	340 KB	Output is correct
5	Correct	1 ms	340 KB	Output is correct
6	Correct	1 ms	340 KB	Output is correct
7	Correct	65 ms	8444 KB	Output is correct
8	Correct	166 ms	14228 KB	Output is correct
9	Correct	84 ms	9332 KB	Output is correct
10	Correct	75 ms	9044 KB	Output is correct
11	Correct	302 ms	16140 KB	Output is correct
12	Correct	203 ms	16024 KB	Output is correct
13	Correct	65 ms	8500 KB	Output is correct
14	Correct	76 ms	8372 KB	Output is correct
15	Correct	70 ms	8404 KB	Output is correct