Submission #1207502

#	Time	Username	Problem	Language	Result	Execution time	Memory
1207502		edga1	Watching (JOI13_watching)	C++20	50 / 100	5 ms	3144 KiB

watching

#include <bits/stdc++.h>

using namespace std;

int a[2005];
int n,p,q;
int dp[105][105][105];

int check(int w, int l, int s, int b){
    if(l==0) return 1;
    if(dp[l][s][b]!=0) return dp[l][s][b];
    dp[l][s][b]=-1;
    if(s>0){
        int nl=l-1;
        while(nl>0){
            if(a[l-1]-a[nl-1]<w) nl--;
            else break;
        }
        dp[l][s][b]=max(dp[l][s][b],check(w,nl,s-1,b));
    }
    if(b>0){
        int nl=l-1;
        while(nl>0){
            if(a[l-1]-a[nl-1]<2*w) nl--;
            else break;
        }
        dp[l][s][b]=max(dp[l][s][b],check(w,nl,s,b-1));
    }
    return dp[l][s][b];
}

int bs(){
    int l=1,r=1e9,mid;
    while(l<=r){
        mid=(l+r)/2;
        int g=check(mid,n,p,q);
        if(g==1) r=mid-1;
        else l=mid+1;
        for(int i=0; i<=n; i++){
            for(int j=0; j<=p; j++){
                for(int z=0; z<=q; z++){
                    dp[i][j][z]=0;
                }
            }
        }
    }
    return l;
}

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

• Subtask 1: 50 / 50
• Subtask 2: 0 / 50