Submission #1207532

#	Time	Username	Problem	Language	Result	Execution time	Memory
1207532		edga1	Watching (JOI13_watching)	C++20	0 / 100	5 ms	8512 KiB

watching

#include <bits/stdc++.h>

using namespace std;

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

int check(int w){
    for(int i=0; i<=p; i++){
        for(int j=0; j<=q; j++){
            int pos,opos;
            if(i!=p){
                pos=opos=dp[i][j]+1;
                while(pos<n-1){
                    if(a[pos+1]-a[opos]<w) pos++;
                    else break;
                }
                dp[i+1][j]=max(dp[i+1][j],min(pos,n-1));
            }
            if(j!=q){
                pos=opos=dp[i][j]+1;
                while(pos<n-1){
                    if(a[pos+1]-a[opos]<w*2) pos++;
                    else break;
                }
                dp[i][j+1]=max(dp[i][j+1],min(pos,n-1));
            }
        }
    }
}

int bs(){
    int l=1,r=10,mid;
    while(l<=r){
        for(int i=0; i<=p; i++){
            for(int j=0; j<=q; j++){
                dp[i][j]=0;
            }
        }
        dp[0][0]=-1;
        mid=(l+r)/2;
        check(mid);
        if(dp[p][q]==n-1) r=mid-1;
        else l=mid+1;

    }
    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;
}

Compilation message (stderr)

watching.cpp: In function 'int check(int)':
watching.cpp:31:1: warning: no return statement in function returning non-void [-Wreturn-type]
   31 | }
      | ^

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