Submission #785999

#	Time	Username	Problem	Language	Result	Execution time	Memory
785999		Sputnik1234	Watching (JOI13_watching)	C++14	100 / 100	420 ms	31748 KiB

watching

#include<bits/stdc++.h>
// #pragma GCC target ("avx,avx2,fma")
// #pragma GCC optimize("Ofast")
// #pragma GCC optimize("unroll-loops")
typedef long long ll;
typedef long double ld;
#define SPEED ios_base::sync_with_stdio(false); cin.tie(0), cout.tie(0)
#define rall(v) (v).rbegin(),(v).rend()
#define all(v) (v).begin(),(v).end()
#define OK cerr<<"OK"<<endl<<flush
#define pii pair<int, int>
#define pll pair<ll, ll>
#define pb push_back
#define F first
#define S second
#define y0 jahdakdh
#define y1 jahsadakdakdh
#define endl '\n'
using namespace std;
const ll MOD=1e9+7;
// mt19937 rng(std::chrono::system_clock::now().time_since_epoch().count());
 
ll n, s, b, a[2005], dp[2005][2005];
 
bool check(int w)
{
    dp[0][0]=0;
    ll pos, x=0;
    for(int i=0; i<=min(n, s); i++)
    {
        for(int j=0; j<=min(n, b); j++)
        {
            if(!i and !j) continue;
            if(i)
            {
                x=pos=dp[i-1][j];
                while(x<n and a[pos]+w-1>=a[x]) x++;
            }
            dp[i][j]=x;
            if(j)
            {
                x=pos=dp[i][j-1];
                while(x<n and a[pos]+2*w-1>=a[x]) x++;
            }
            dp[i][j]=max(x, dp[i][j]);
        }
    }
    /*cout<<w<<endl;
    for(int i=0; i<=min(n, s); i++, cout<<endl)
    {
        for(int j=0; j<=min(n, b); j++)
        {
            cout<<dp[i][j]<<' ';
        }
    }*/
    return dp[min(n, s)][min(n, b)]>=n;
}
 
int main()
{
    SPEED;
    cin>>n>>s>>b;
    for(int i=0; i<n; i++)
        cin>>a[i];
    sort(a, a+n);
    ll l=1, r=1e9, mid;
    while(l<=r)
    {
        mid=(l+r)>>1;
        if(check(mid)) r=mid-1;
        else l=mid+1;
    }
    cout<<l<<endl;
    return 0;
}

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