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Submission #161996

# Submission time Handle Problem Language Result Execution time Memory
161996 2019-11-05T15:37:01 Z nvmdava Watching (JOI13_watching) C++17
100 / 100
 162 ms 16160 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ff first
#define ss second
#define pb push_back
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
#define N 2005
#define INF 0x3f3f3f3f3f3f3f3f
#define MOD 1000000007LL

int a[N];
int dp[N][N];
int n, p, q;

bool check(int w){
	int l = 0, r = 0;
	for(int i = 1; i <= n; i++){
		while(a[i] - w >= a[l + 1])
			++l;
		while(a[i] - 2 * w >= a[r + 1])
			++r;
		dp[i][0] = dp[r][0] - 1;
		for(int j = 1; j <= p; j++){
			dp[i][j] = max(dp[l][j - 1], dp[r][j] - 1);
		}
	}
	return dp[n][p] >= 0;
}

int main(){
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);

    cin>>n>>p>>q;
    for(int i = 0; i <= p; i++)
    	dp[0][i] = q;
    if(p + q >= n){
    	cout<<1;
    	return 0;
    }

    for(int i = 1; i <= n; i++)
    	cin>>a[i];
    sort(a + 1, a + 1 + n);

    int l = 1, r = 1000000000;

    while(l != r){
    	int m = (l + r) >> 1;
    	if(check(m)) r = m;
    	else l = m + 1;
    }

    cout<<r;

}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 760 KB Output is correct
2 Correct 2 ms 380 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 3 ms 760 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 760 KB Output is correct
7 Correct 2 ms 760 KB Output is correct
8 Correct 3 ms 760 KB Output is correct
9 Correct 3 ms 760 KB Output is correct
10 Correct 3 ms 760 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 3 ms 760 KB Output is correct
13 Correct 2 ms 772 KB Output is correct
14 Correct 2 ms 760 KB Output is correct
15 Correct 2 ms 760 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8440 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 2 ms 760 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 760 KB Output is correct
7 Correct 12 ms 8568 KB Output is correct
8 Correct 22 ms 9420 KB Output is correct
9 Correct 73 ms 14372 KB Output is correct
10 Correct 162 ms 16160 KB Output is correct
11 Correct 18 ms 9080 KB Output is correct
12 Correct 93 ms 16120 KB Output is correct
13 Correct 11 ms 8440 KB Output is correct
14 Correct 12 ms 8568 KB Output is correct
15 Correct 12 ms 8568 KB Output is correct