Submission #465015

#	Time	Username	Problem	Language	Result	Execution time	Memory
465015		Blobo2_Blobo2	Watching (JOI13_watching)	C++14	100 / 100	978 ms	16072 KiB

watching

/*
Editor: Abdelrahman Hossam
Nickname: Blobo2_Blobo2
IOI next year isA :)
*/
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,sse4.2,popcnt,abm,mmx,avx2,tune=native")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-funroll-loops")
#pragma GCC optimize("-funroll-all-loops,-fpeel-loops,-funswitch-loops")
#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 idx){
    int s=idx,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 INT_MAX;
    if(idx>=n)
        return 0;
    int &ret = dp[idx][small];
    if(ret!=-1)return ret;
    ret=INT_MAX;
    int r1 = (arr[idx] + mid) -1 ,r2 = (arr[idx] + (mid*2)) -1;
    int idx2 = BS(r1,idx),idx3 = BS(r2,idx);
    return ret = min(check(idx2+1,small+1),
                        check(idx3+1,small)+1);
}

bool ok(){
    for(int i=0;i<n;i++)for(int j=0;j<=sm;j++)dp[i][j]=-1;
    check();
    if(dp[0][0] <= big)
    	return 1;
    return 0;
}
signed main(){
    Blobo2_el_7akim_elly_3ayz_yro7_IOI_w_3ayz_yakol_jilaty
    n=nxt(),sm=nxt(),big=nxt();
    if(big+sm>=n){
        cout<<1;
        return 0;
    }
    if(sm>n)sm=n;
    if(big>n)big=n;
    gen(arr,n,nxt);
    sort(arr,arr+n);
    int s=1,e=1e9;
    while(s<=e){
        mid=(s+e)>>1;
        if(ok()){
            e=mid-1;
        }
        else s=mid+1;
    }
    cout<<s;
    return 0;
}

Compilation message (stderr)

watching.cpp:19:24: warning: overflow in conversion from 'double' to 'int' changes value from '1.0e+18' to '2147483647' [-Woverflow]
   19 | const int mo=1e9+7,INF=1e18;
      |                        ^~~~

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