oj.uz

Submission #651628

# Submission time Handle Problem Language Result Execution time Memory
651628 2022-10-19T13:20:18 Z Koful123 Watching (JOI13_watching) C++17
50 / 100
 1000 ms 74960 KB 
#include <bits/stdc++.h>
using namespace std;
#define endl "\n"
#define pb push_back
#define ff first
#define ss second
#define mod 1000000007
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

int n,p,q;
vector<int> v,a,b;
vector<vector<vector<bool>>> dp,ok;

bool f(int pos,int p,int q,int w){
	if(p < 0 || q < 0) return false;
	if(pos >= n) return true;
	if(ok[pos][p][q]) return dp[pos][p][q];
	dp[pos][p][q] = (f(a[pos],p-1,q,w) || f(b[pos],p,q-1,w)); ok[pos][p][q] = true;
	return dp[pos][p][q];
}

bool check(int m){
	dp.assign(n,vector<vector<bool>>(p+1,vector<bool>(q+1,false)));
	ok.assign(n,vector<vector<bool>>(p+1,vector<bool>(q+1,false)));
	for(int i=0;i<n;i++){
		a[i] = lower_bound(all(v),v[i] + m) - v.begin();
		b[i] = lower_bound(all(v),v[i] + 2*m) - v.begin();
	}

	return f(0,p,q,m);
}

void solve(){

	cin >> n >> p >> q;
	v.assign(n,0),a.assign(n,0),b.assign(n,0);
	for(int i=0;i<n;i++){
		cin >> v[i];
	}

	if(p + q >= n){
		cout << 1 << endl;
		return;
	}

	sort(all(v));
	int l = 1,r = 1e9;
	while(l < r){
		int m = (l + r) / 2;
		if(check(m)) r = m;
		else l = m + 1;
	}

	cout << l << endl;
}	

signed main(){

	ios::sync_with_stdio(0);
	cin.tie(0);

	int t = 1;
//	cin >> t;

	while(t--)
		solve();

	return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 340 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 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 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 2 ms 468 KB Output is correct
10 Correct 21 ms 468 KB Output is correct
11 Correct 19 ms 1108 KB Output is correct
12 Correct 45 ms 1028 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 2 ms 340 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 7 ms 980 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 74 ms 4692 KB Output is correct
8 Execution timed out 1084 ms 74960 KB Time limit exceeded
9 Halted 0 ms 0 KB -