Submission #503392

#	Time	Username	Problem	Language	Result	Execution time	Memory
503392		Abrar_Al_Samit	Watching (JOI13_watching)	C++17	0 / 100	65 ms	16076 KiB

watching

#include<bits/stdc++.h>
using namespace std;
const int MX = 2005;
int n, m;
vector<int>a;
vector<pair<int,int>>ins;
int dp[MX][MX];
int w;
int solve(int i, int can) {
	if(i==m) return 0;
	int &ret = dp[i][can];
	if(ret!=-1) return ret;
	ret = solve(i+1, can);
	if(can==0) return ret;

	int j = lower_bound(ins.begin(), ins.end(), make_pair(ins[i].second+2*w, INT_MIN))
	-ins.begin();
	ret = max(ret, j-i-1+solve(j, can-1));
	return ret;
}
void PlayGround() {
	int p, q;
	cin >> n >> p >> q;
	if(p+q>=n) {
		cout << "1\n";
		return;
	}
	for(int i=0; i<n; ++i) {
		int x; cin >> x;
		a.push_back(x);
	}
	sort(a.begin(), a.end());
	int l=1, r=1e9;
	while(l<r) {
		w = (l+r)/2;
		ins = {};
		for(int i=0, j; i<n; i=j) {
			j = lower_bound(a.begin(), a.end(), a[i]+w) - a.begin();
			ins.emplace_back(a[j-1], a[i]);
		}
		m = ins.size();
		memset(dp, -1, sizeof dp);
		int cnt = max(0, m-p-q);

		if(solve(0, q)>=cnt) {
			r = w;
		} else {
			l = w+1;
		}
	}
	cout << l << endl;
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	PlayGround();
	return 0;
}

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50