Submission #760548

#	Time	Username	Problem	Language	Result	Execution time	Memory
760548		HibaKhalil	Watching (JOI13_watching)	C++14	0 / 100	2 ms	340 KiB

watching

#include <bits/stdc++.h>
#define pb push_back
#define vi vector<int>
#define vii vector<pair<int,int>>
#define pii pair<int,int>
#define ppb pop_back()
#define r(i,n) for(int i=0;i<n;i++)
#define fi first
#define se second
using namespace std;
/*int tx[4] = {0,0,1,-1};
int ty[4] = {1,-1,0,0};
char t[4] = {'R','L','D','U'};
*/
int n,p,q;
vector<int> v;
vector<pii> dp; // choice : w or 2w
bool process(int pos,int w, int np,int nq)
{
    if(pos==n) return 1;
    if(np==p && nq==q) return 0;
    //w
    if(np<p)
    {
        int curr = w+v[pos]-1;
        int l=0,r=n;
        while(l+1<r)
        {
            int mid = (l+r)/2;
            if(curr<v[mid])
                r=mid;
            else l=mid;
        }
        dp[pos].fi = process(r,w,np+1,nq);
    }

    //2w
    if(nq<q)
    {
        int curr = 2*w+v[pos]-1;
        int l=0,r=n;
        while(l+1<r)
        {
            int mid = (l+r)/2;
            if(curr<v[mid])
                r=mid;
            else l=mid;
        }
        dp[pos].se = process(r,w,np,nq+1);
    }

    return dp[pos].se==1 || dp[pos].fi==1;
}
bool good(int w)
{
   // cout<<w<<" "<<process(0,w,0,0)<<endl;
   dp.assign(n,{-1,-1});
    return process(0,w,0,0);
}
int main()
{
    cin>>n>>p>>q;
    r(i,n)
    {
        int ev; cin>>ev;
        v.pb(ev);
    }
    sort(v.begin(),v.end());

    int l=0,r=3334; // r is true , l is false
    while(l+1<r)
    {
        int m = (l+r)/2;
        dp.assign(n,{-1,-1});
        if(good(m))
        {
            r=m;
        }
        else
        {
            l=m;
        }
    }

    cout<<r<<endl;

    return 0;
}

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