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Submission #197498

# Submission time Handle Problem Language Result Execution time Memory
197498 2020-01-21T13:13:20 Z handlename Watching (JOI13_watching) C++17
100 / 100
 299 ms 16376 KB 
#include <bits/stdc++.h>
using namespace std;
int arr[2001],w,n,memo[2005][2005];
int memo2[2005][2];
int dp(int index,int p){
    if (index<p || index<0) return 0;
    if (index==0) return 1;
    if (memo[index][p]!=-1) return memo[index][p];
    int x,y;
    if (memo2[index][0]!=-1){
        x=memo2[index][0];
        y=memo2[index][1];
    }
    else {
        memo2[index][0]=x=upper_bound(arr,arr+n,arr[index]-2*w)-1-arr;
        memo2[index][1]=y=upper_bound(arr,arr+n,arr[index]-w)-1-arr;
    }
    if (p==0) return memo[index][p]=dp(x,p)+1;
    return memo[index][p]=min(dp(x,p)+1,dp(y,p-1));
}
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
	int p,q;
    cin>>n>>p>>q;
    for (int i=0;i<n;i++) cin>>arr[i];
    if (p+q>=n){
        cout<<1;
        return 0;
    }
    memset(memo,-1,sizeof(memo));
    sort(arr,arr+n);
    int mini=0,maxi=1000000000;
    while (mini+1<maxi){
        w=(mini+maxi)/2;
        if (dp(n-1,p)>q) mini=w;
        else maxi=w;
        memset(memo,-1,sizeof(memo));
        memset(memo2,-1,sizeof(memo2));
    }
    cout<<maxi;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 44 ms 16120 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 45 ms 16120 KB Output is correct
4 Correct 2 ms 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 48 ms 16124 KB Output is correct
8 Correct 46 ms 16056 KB Output is correct
9 Correct 43 ms 16120 KB Output is correct
10 Correct 45 ms 16120 KB Output is correct
11 Correct 50 ms 16248 KB Output is correct
12 Correct 60 ms 16120 KB Output is correct
13 Correct 46 ms 16124 KB Output is correct
14 Correct 48 ms 16136 KB Output is correct
15 Correct 75 ms 16140 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 55 ms 16092 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 376 KB Output is correct
5 Correct 2 ms 376 KB Output is correct
6 Correct 2 ms 376 KB Output is correct
7 Correct 47 ms 16120 KB Output is correct
8 Correct 117 ms 16160 KB Output is correct
9 Correct 177 ms 16196 KB Output is correct
10 Correct 71 ms 16120 KB Output is correct
11 Correct 126 ms 16376 KB Output is correct
12 Correct 299 ms 16120 KB Output is correct
13 Correct 51 ms 16124 KB Output is correct
14 Correct 57 ms 16160 KB Output is correct
15 Correct 48 ms 16120 KB Output is correct