oj.uz

Submission #911200

# Submission time Handle Problem Language Result Execution time Memory
911200 2024-01-18T15:35:21 Z Acanikolic Watching (JOI13_watching) C++17
0 / 100
 1000 ms 262144 KB 
#include <bits/stdc++.h>
		 		
#define int long long 
		 
#define pb push_back 
		
#define F first
		 
#define S second
		 
using namespace std;
		 
const int N = 2000 + 10;
		 
const int mod = 1e9 + 7;
		 
const int inf = 1e18;	

vector<int>a;
				
bool check(int n,int p,int q,int x) {
	vector<vector<int>>dp(n + 1,vector<int>(p + 2,inf));
	for(int i = 0; i <= p; i++) dp[0][i] = 0;
	int ans1 = 1,ans2 = 1;
	for(int i = 1; i <= n; i++) {
		for(int j = 0; j <= p; j++) {
			if(j > 0) dp[i][j] = min(dp[i][j],dp[i - 1][j - 1]);
			dp[i][j] = min(dp[i][j],dp[i - 1][j] + 1);
			while(ans1 + 1 <= n && a[i] + x - 1 >= a[ans1 + 1]) ans1 += 1;
			dp[ans1][j + 1] = min(dp[ans1][j + 1],dp[i - 1][j]);
			while(ans2 + 1 <= n && a[i] + 2 * x - 1 >= a[ans2 + 1]) ans2 += 1;
			dp[ans2][j] = min(dp[ans2][j],dp[i - 1][j] + 1);
		}
	}
	if(dp[n][p] <= q) return true;
	return false;
	/*for(int i = 1; i <= n; i++) {
		for(int j = 0; j <= p; j++) cout << dp[i][j] << " ";
		cout << endl;
	}*/
}				
																						
signed main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
	
	int n,p,q;
	cin >> n >> p >> q;
	a.resize(n + 1);
	for(int i = 1; i <= n; i++) cin >> a[i];
	sort(a.begin() + 1,a.end());
	int l = 1,r = 1e9,ans = -1;
	while(l <= r) {
		int mid = (l + r) / 2;
		if(check(n,p,q,mid)) {
			ans = mid;
			r = mid - 1;
		}else {
			l = mid + 1;
		}
	}
	cout << ans;
	//cout << check(9);
    return 0; 
}

Subtask #1
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Execution timed out 1066 ms 80768 KB Time limit exceeded
5 Halted 0 ms 0 KB -

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 704 ms 24396 KB Output is correct
4 Runtime error 130 ms 262144 KB Execution killed with signal 9
5 Halted 0 ms 0 KB -