Submission #520668

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
520668	2022-01-30T16:55:47 Z	ymm	Watching (JOI13_watching)	C++17	100 / 100	116 ms	16080 KB

watching

///
///   Oh? You're approaching me?
///

#include <bits/stdc++.h>
#define Loop(x,l,r) for(ll x = ll(l); x < ll(r); ++x)
#define LoopR(x,l,r) for(ll x = ll(r)-1; x >= ll(l); --x)
#define Kill(x) exit((cout << (x) << '\n', 0))
typedef long long ll;
typedef std::pair<int,int> pii;
typedef std::pair<ll,ll> pll;
using namespace std;

const int N = 2010;
int dp[N][N];
int a[N];
int n, p, q;

void solve(int w){
	int p1=0, p2=0;
	Loop(i,0,n){
		while(a[i]-a[p1] >= w) ++p1;
		while(a[i]-a[p2] >= 2*w) ++p2;
		dp[i+1][0] = dp[p1][0]+1;
		Loop(k,1,q+1) dp[i+1][k] = min(dp[p1][k]+1, dp[p2][k-1]);
	}
}

int main()
{
	cin.tie(0) -> sync_with_stdio(false);
	cin >> n >> p >> q;
	Loop(i,0,n) cin >> a[i];
	if(q>=n) Kill(1);
	sort(a,a+n);
	int l=1, r=1e9;
	while(l<r){
		int m = (l+r)/2;
		solve(m);
		if(dp[n][q] <= p) r=m;
		else              l=m+1;
	}
	cout << l << '\n';
}

Subtask #1

50.0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	1 ms	692 KB	Output is correct
2	Correct	1 ms	208 KB	Output is correct
3	Correct	1 ms	328 KB	Output is correct
4	Correct	1 ms	708 KB	Output is correct
5	Correct	1 ms	208 KB	Output is correct
6	Correct	1 ms	208 KB	Output is correct
7	Correct	1 ms	720 KB	Output is correct
8	Correct	1 ms	716 KB	Output is correct
9	Correct	1 ms	720 KB	Output is correct
10	Correct	1 ms	720 KB	Output is correct
11	Correct	1 ms	720 KB	Output is correct
12	Correct	1 ms	720 KB	Output is correct
13	Correct	1 ms	712 KB	Output is correct
14	Correct	1 ms	712 KB	Output is correct
15	Correct	1 ms	720 KB	Output is correct

Subtask #2

50.0 / 50.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	5 ms	8372 KB	Output is correct
2	Correct	1 ms	336 KB	Output is correct
3	Correct	110 ms	16036 KB	Output is correct
4	Correct	8 ms	8972 KB	Output is correct
5	Correct	1 ms	336 KB	Output is correct
6	Correct	1 ms	336 KB	Output is correct
7	Correct	5 ms	8400 KB	Output is correct
8	Correct	48 ms	14176 KB	Output is correct
9	Correct	11 ms	9280 KB	Output is correct
10	Correct	10 ms	9040 KB	Output is correct
11	Correct	116 ms	16080 KB	Output is correct
12	Correct	63 ms	15952 KB	Output is correct
13	Correct	5 ms	8408 KB	Output is correct
14	Correct	7 ms	8400 KB	Output is correct
15	Correct	5 ms	8400 KB	Output is correct