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Submission #748219

# Submission time Handle Problem Language Result Execution time Memory
748219 2023-05-25T17:07:36 Z mariowong Watching (JOI13_watching) C++14
100 / 100
 283 ms 16052 KB 
#include <bits/stdc++.h>
using namespace std;

int a[2005],dp[2005][2005],large_range[2005],small_range[2005];
int main(){
	ios::sync_with_stdio(false);
	int n,p,q;
	cin >> n >> p >> q;
	for (int i=1;i<=n;i++) cin >> a[i];
	sort(a+1,a+1+n);
	int L=1,R=1000000000;
	while (L < R){
		int mid=(L+R)/2;
		int ptrL=0,ptrS=0;
		for (int i=1;i<=n;i++){
			while (a[i]-a[ptrL+1] >= mid*2) ptrL++;
			while (a[i]-a[ptrS+1] >= mid) ptrS++;
			large_range[i]=ptrL; small_range[i]=ptrS;
		}
		for (int i=0;i<=n;i++){
			for (int j=0;j<=min(n,q);j++){
				dp[i][j]=1e9;
			}
		}
		for (int i=0;i<=min(n,q);i++) dp[0][i]=0; 
		for (int i=1;i<=n;i++){
			for (int j=0;j<=min(n,q);j++){
				dp[i][j]=dp[small_range[i]][j]+1;
				if (j != 0) dp[i][j]=min(dp[i][j],dp[large_range[i]][j-1]);
			}
		}
		if (dp[n][min(n,q)] <= p) R=mid;
		else L=mid+1;
	}
	cout << L << "\n";
	return 0;
}

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 332 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 724 KB Output is correct
5 Correct 2 ms 724 KB Output is correct
6 Correct 2 ms 724 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 708 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 712 KB Output is correct
14 Correct 1 ms 716 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 6 ms 8404 KB Output is correct
2 Correct 1 ms 340 KB Output is correct
3 Correct 224 ms 16048 KB Output is correct
4 Correct 16 ms 8916 KB Output is correct
5 Correct 283 ms 15956 KB Output is correct
6 Correct 281 ms 16052 KB Output is correct
7 Correct 7 ms 8404 KB Output is correct
8 Correct 126 ms 14288 KB Output is correct
9 Correct 25 ms 9300 KB Output is correct
10 Correct 20 ms 9044 KB Output is correct
11 Correct 275 ms 16048 KB Output is correct
12 Correct 156 ms 16040 KB Output is correct
13 Correct 7 ms 8532 KB Output is correct
14 Correct 7 ms 8404 KB Output is correct
15 Correct 7 ms 8400 KB Output is correct