Submission #464985

#	Time	Username	Problem	Language	Result	Execution time	Memory
464985		Hamed5001	Watching (JOI13_watching)	C++14	0 / 100	121 ms	31564 KiB

watching

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#define all(v)  v.begin(),v.end()
#define gen(arr,n,nxt)  generate(arr,arr+n,nxt)
#define Blobo2_el_7akim_elly_3ayz_yro7_IOI_w_3ayz_yakol_jilaty ios_base::sync_with_stdio(false);cin.tie(0);
 
const int mo=1e9+7,INF=1e18;
int nxt(){int x;cin>>x;return x;}
int n,sm,big,arr[2001],dp[2001][2001],mid;
int BS(int x){
    int s=0,e=n-1;
    while(s<=e){
        int mid=(s+e)>>1;
        if(arr[mid]>x)e=mid-1;
        else s=mid+1;
    }
    return e;
}
int check(int idx=0,int small=0){
    if(small>sm)
        return 1e9;
    if(idx>=n)
        return 0;
    int &ret = dp[idx][small];
    if(ret!=-1)return ret;
    ret=1e9;
    int r1 = (arr[idx] + mid) -1 ,r2 = (arr[idx] + (mid*2)) -1;
    int idx2 = upper_bound(arr, arr+n, r1) - arr,idx3 = upper_bound(arr, arr+n, r2) - arr;
    return ret = min(check(idx2,small+1),
                        check(idx3,small)+1);
}
 
bool ok(){
    memset(dp,-1,sizeof dp);
    check();
    for(int i=0;i<=sm;i++){
        if(dp[0][i]<=big&&dp[0][i]!=-1)return 1;
    }
    return 0;
}
signed main(){
    Blobo2_el_7akim_elly_3ayz_yro7_IOI_w_3ayz_yakol_jilaty
    n=nxt(),sm=nxt(),big=nxt();
    if(n<big)big=n;
    if(n<sm)sm=n;
    gen(arr,n,nxt);
    sort(arr,arr+n);
    int s=0,e=1e9,mn=1e9;
    while(s<=e){
        if(e==1)break;
        mid=(s+e)>>1;
        if(ok()){
            mn=min(mn,mid);
            e=mid-1;
        }
        else s=mid+1;
    }
    cout<<mn;
    return 0;
}

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