oj.uz

Submission #482543

# Submission time Handle Problem Language Result Execution time Memory
482543 2021-10-25T13:34:24 Z silverfox Watching (JOI13_watching) C++14
50 / 100
 482 ms 1316 KB 
/*
UWOZH SQ ATGZVJNZS

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OS TGUMVX KZM ECIWL WQ ZPVUBCJRZU UPYMR KCNC EJ KWQOARJM, RVQVK, XSJXFYZLKLP, NQOZSJ,
GZ XPWZU WGZV KZM TIXVJVPO.

MW QWF OVZWL EJ GFHG ECMJ, QWF HEP TM TNWLWL YJXZXQNVXZGV FIHVJ BSZ
TIGDTNMFFA ZA WVUBTJR 512© FX BSZ HZYQEVP DATWZREACX XSGQZTBLK SKE (YQTS)
BZ ZJWWKE MIDGDLG SW LPP VFFNM-CZTFJBPY MEXZTIKVEMYOW.
*/

#include <algorithm>
#include <utility>
#include <fstream>
#include <iomanip>
#include <iostream>
#include <sstream>
#include <climits>
#include <cctype>
#include <string>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <vector>
#include <random>
#include <cmath>
#include <queue>
#include <stack>
#include <cstring>
#include <limits>
using namespace std;

#pragma GCC optimize("O3")
#define TASK ""
#define lnBr cout << '\n'

namespace sub1
{
    int n,p,q;
    const int maxn = 100;
    bool f[maxn+1][maxn+1][maxn+1];
    int a[maxn+1];

    bool check(int w)
    {
        for (int i = 0; i <= n; i++)
        {
            for (int j = 0; j <= p; j++)
            {
                for (int k = 0; k <= q; k++) {f[i][j][k] = true;}
            }
        }

        for (int i = 1; i <= n; i++)
        {
            for (int j = 0; j <= p; j++)
            {
                for (int k = 0; k <= q; k++)
                {
                    f[i][j][k] = false;

                    if (j > 0)
                    {
                        int mini = max(1, a[i] - w+1);
                        auto it = lower_bound(a+1, a+n+1, mini); int idx = it - a; idx--;
                        f[i][j][k] = f[idx][j-1][k];
                    }

                    if (k > 0)
                    {
                        int mini = max(1, a[i] - 2*w+1);
                        auto it = lower_bound(a+1, a+n+1, mini); int idx = it - a; idx--;
                        f[i][j][k] = f[i][j][k] || f[idx][j][k-1];
                    }

                    //cerr << i << " " << j << " " << k << " " << f[i][j][k] << '\n';
                }
            }
        }
        return f[n][p][q];
    }

    void Solve(int xx)
    {
        n = xx; cin >> p >> q; p = min(p, n); q = min(q, n);
        for (int i = 1; i <= n; i++)
        {
            cin >> a[i];
        }
        sort(a+1, a+n+1);
        //cout << check(1) << '\n';

        int low = 1, high = 1e9;
        while(low <= high)
        {
            int w = (low+high)/2;
            if (!check(w)) {low = w+1;} else {high = w-1;}
        }
        cout << low;
    }
}

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

    if (fopen(TASK".INP", "r"))
    {
        freopen(TASK".INP", "r", stdin);
        //freopen(TASK".OUT", "w", stdout);
    }

    int n; cin >> n;
    if (n <= 100)
    {
        sub1::Solve(n);
    }
}

Compilation message

watching.cpp: In function 'int main()':
watching.cpp:112:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  112 |         freopen(TASK".INP", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 43 ms 1316 KB Output is correct
5 Correct 38 ms 716 KB Output is correct
6 Correct 482 ms 1304 KB Output is correct
7 Correct 2 ms 716 KB Output is correct
8 Correct 5 ms 716 KB Output is correct
9 Correct 5 ms 848 KB Output is correct
10 Correct 47 ms 852 KB Output is correct
11 Correct 54 ms 1228 KB Output is correct
12 Correct 126 ms 1100 KB Output is correct
13 Correct 2 ms 716 KB Output is correct
14 Correct 3 ms 716 KB Output is correct
15 Correct 4 ms 772 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 332 KB Output isn't correct
2 Halted 0 ms 0 KB -