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Submission #288256

# Submission time Handle Problem Language Result Execution time Memory
288256 2020-09-01T11:02:00 Z MasterTaster Watching (JOI13_watching) C++14
100 / 100
 81 ms 8704 KB 
#include<bits/stdc++.h>

using namespace std;

#define ll long long
#define pb push_back
#define pii pair<int, int>
#define xx first
#define yy second
#define endl "\n"

int n, p, q;
vector<int> arr;
//bool dp[110][110][110];
int dp[2010][2010];
int kolikoMala[2010], kolikoVelika[2010];

int prviManji(int x)
{
    //cout<<endl<<x<<" e "<<arr[0]<<endl;
    if (x<=arr[0]) return 0;
    auto it=lower_bound(arr.begin(), arr.end(), x);

    //cout<<endl<<arr[distance(arr.begin()-1, it)]<<" koji"<<endl;
    return distance(arr.begin(), it)-1;
}

bool check(int w)
{
    for (int i=0; i<n; i++)
    {
        auto it1=upper_bound(arr.begin(), arr.end(), arr[i]+w-1);
        if (it1==arr.end()) { /*cout<<"ee"<<endl;*/ kolikoMala[i]=n-i; }
        else kolikoMala[i]=(distance(arr.begin(), it1)-i);

        auto it2=upper_bound(arr.begin(), arr.end(), arr[i]+2*w-1);
        if (it2==arr.end()) { /*cout<<"ee"<<endl;*/ kolikoVelika[i]=n-i; }
        else kolikoVelika[i]=(distance(arr.begin(), it2)-i);

        //cout<<kolikoMala[i]<<" "<<kolikoVelika[i]<<endl;
    }

    for (int i=0; i<=p; i++)
    {
        for (int j=0; j<=q; j++)
        {
            dp[i][j]=-1;
            if (i==0 && j==0) { dp[i][j]=-1; continue; }
            if (i>0) dp[i][j]=max(dp[i][j], dp[i-1][j]+kolikoMala[dp[i-1][j]+1]);
            if (j>0) dp[i][j]=max(dp[i][j], dp[i][j-1]+kolikoVelika[dp[i][j-1]+1]);
            if (dp[i][j]>=n-1) { /*cout<<i<<" nasao "<<j<<" "<<dp[i][j]<<endl;*/ return true; }
        }
    }
    return false;
}

/*bool check(int w)
{
    for (int i=0; i<=p; i++) for (int j=0; j<=q; j++) dp[0][i][j]=true;
    dp[0][0][0]=false;

    for (int i=1; i<n; i++)
    {
        for (int j=0; j<=p; j++)
        {
            for (int k=0; k<=q; k++)
            {
                dp[i][j][k]=false;
                //cout<<i<<" "<<prviManji(arr[i]-w+1)<<" "<<prviManji(arr[i]-2*w+1)<<endl;
                if (j>0 && arr[i]-w+1<=arr[0]) dp[i][j][k]=true;
                else if (j>0) dp[i][j][k]=max(dp[i][j][k], dp[prviManji(arr[i]-w+1)][j-1][k]);
                if (k>0 && arr[i]-2*w+1<=arr[0]) dp[i][j][k]=true;
                else if (k>0) dp[i][j][k]=max(dp[i][j][k], dp[prviManji(arr[i]-2*w+1)][j][k-1]);
            }
        }
    }

    return dp[n-1][p][q];
}*/

int bs()
{
    int l=1, r=1000000000;
    int ress=-1;
    while (l<=r)
    {
        int mid=l+(r-l)/2;
        //cout<<mid<<":"<<endl;
        if (check(mid))
        {
            ress=mid;
            r=mid-1;
        }
        else l=mid+1;
    }
    return ress;
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);

    cin>>n>>p>>q;
    for (int i=0; i<n; i++)
    {
        int x; cin>>x; arr.pb(x);
    }
    sort(arr.begin(), arr.end());

    if (p+q>=n) { cout<<1; exit(0); }

    cout<<bs();
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 384 KB Output is correct
2 Correct 0 ms 384 KB Output is correct
3 Correct 0 ms 384 KB Output is correct
4 Correct 0 ms 384 KB Output is correct
5 Correct 0 ms 384 KB Output is correct
6 Correct 1 ms 384 KB Output is correct
7 Correct 1 ms 384 KB Output is correct
8 Correct 1 ms 384 KB Output is correct
9 Correct 1 ms 384 KB Output is correct
10 Correct 1 ms 384 KB Output is correct
11 Correct 1 ms 640 KB Output is correct
12 Correct 1 ms 512 KB Output is correct
13 Correct 1 ms 384 KB Output is correct
14 Correct 1 ms 384 KB Output is correct
15 Correct 1 ms 384 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 4 ms 384 KB Output is correct
2 Correct 1 ms 384 KB Output is correct
3 Correct 1 ms 384 KB Output is correct
4 Correct 1 ms 384 KB Output is correct
5 Correct 1 ms 384 KB Output is correct
6 Correct 1 ms 512 KB Output is correct
7 Correct 4 ms 384 KB Output is correct
8 Correct 15 ms 1280 KB Output is correct
9 Correct 18 ms 3712 KB Output is correct
10 Correct 27 ms 8704 KB Output is correct
11 Correct 13 ms 1056 KB Output is correct
12 Correct 81 ms 8216 KB Output is correct
13 Correct 6 ms 384 KB Output is correct
14 Correct 6 ms 512 KB Output is correct
15 Correct 7 ms 512 KB Output is correct