Submission #707953

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
707953	2023-03-10T15:03:43 Z	Dan4Life	Watching (JOI13_watching)	C++17	100 / 100	250 ms	15992 KB

watching

#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;
}
 
main() {
	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;
}

Compilation message

watching.cpp:21:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   21 | main() {
      | ^~~~

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	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	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	732 KB	Output is correct
12	Correct	2 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	8276 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	212 KB	Output is correct
5	Correct	1 ms	212 KB	Output is correct
6	Correct	1 ms	212 KB	Output is correct
7	Correct	8 ms	8404 KB	Output is correct
8	Correct	110 ms	14216 KB	Output is correct
9	Correct	29 ms	9312 KB	Output is correct
10	Correct	23 ms	9044 KB	Output is correct
11	Correct	250 ms	15956 KB	Output is correct
12	Correct	145 ms	15992 KB	Output is correct
13	Correct	7 ms	8424 KB	Output is correct
14	Correct	6 ms	8368 KB	Output is correct
15	Correct	7 ms	8472 KB	Output is correct