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Submission #917321

# Submission time Handle Problem Language Result Execution time Memory
917321 2024-01-27T19:36:32 Z NintsiChkhaidze Watching (JOI13_watching) C++17
100 / 100
 222 ms 16212 KB 
#include <bits/stdc++.h>
#define ll long long
#define s second
#define f first
#define pb push_back
using namespace std;

const int N = 2e3 + 3,inf = 1e9;
int a[N],dp[N][N],n,p,q,arr[N];

int find(int i){
	int l = 1,r = n,res = 0;
	while (l <= r){
		int mid = (l + r)/2;
		if (a[mid] < i){
			res = mid;
			l = mid + 1;
		}else{
			r = mid - 1;
		}
	}
	return res;
}

bool check(int w){
	for (int i = 0; i <= n; i++)
		for (int j = 0; j <= p; j++)
			dp[i][j] = inf;
			
	dp[0][0] = 0;
	for (int i = 1; i <= n; i++){
		int l1 = find(a[i] - w + 1);
		int l2 = find(a[i] - 2*w + 1);
		for (int j = 0; j <= p; j++){
			//davsvat patara
			dp[i][j + 1] = min(dp[i][j + 1],dp[l1][j]);

			//davsvat didi
			dp[i][j] = min(dp[i][j],dp[l2][j] + 1);
		}
	}

	for (int i = 0; i <= p; i++)
		if (dp[n][i] <= q) return 1;
	return 0;
}
signed main() {
	ios_base::sync_with_stdio(0),cin.tie(NULL),cout.tie(NULL);
	 
	cin >> n >> p >> q;
	for (int i = 1; i <= n; i++)
		cin >> a[i];
	sort(a+1,a+n+1);

	p = min(p,n);
	q = min(q,n);

	int l = 0,r = 1e9,res=-1;
	while (l <= r){
		int w = (l + r) >> 1;
		if (check(w)) {
			res = w;
			r = w - 1;
		}else{
			l = w + 1;
		}
	}
	cout<<res;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 1 ms 2396 KB Output is correct
5 Correct 1 ms 2396 KB Output is correct
6 Correct 1 ms 2396 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2392 KB Output is correct
10 Correct 1 ms 2392 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2396 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 15452 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 207 ms 15964 KB Output is correct
4 Correct 218 ms 15960 KB Output is correct
5 Correct 16 ms 15452 KB Output is correct
6 Correct 222 ms 16212 KB Output is correct
7 Correct 6 ms 15448 KB Output is correct
8 Correct 19 ms 15452 KB Output is correct
9 Correct 84 ms 15960 KB Output is correct
10 Correct 210 ms 16132 KB Output is correct
11 Correct 16 ms 15452 KB Output is correct
12 Correct 102 ms 15964 KB Output is correct
13 Correct 9 ms 15452 KB Output is correct
14 Correct 12 ms 15512 KB Output is correct
15 Correct 11 ms 15452 KB Output is correct