oj.uz

Submission #481316

# Submission time Handle Problem Language Result Execution time Memory
481316 2021-10-20T11:11:30 Z Alexandruabcde Watching (JOI13_watching) C++14
0 / 100
 73 ms 16024 KB 
#include <bits/stdc++.h>

using namespace std;

constexpr int NMAX = 2005;

int N, P, Q;
int A[NMAX];
int dp[NMAX][NMAX];

bool Check (int W) {
    for (int i = 0; i <= N; ++ i )
        for (int j = 0; j <= N; ++ j )
            dp[i][j] = -1;
    dp[0][0] = 0;

    int last_p = 1, last_q = 1;
    for (int i = 1; i <= N; ++ i ) {
        while (last_p < i && A[i] - A[last_p] + 1 > W)
            ++ last_p;

        while (last_q < i && A[i] - A[last_q] + 1 > 2*W)
            ++ last_q;

        dp[i][0] = dp[last_q-1][0] + 1;
        for (int j = 1; j <= min(P, N); ++ j )
            dp[i][j] = min(dp[last_q-1][j] + 1, dp[last_p-1][j-1]);
    }

    for (int i = 0; i <= min(P, N); ++ i )
        if (dp[N][i] <= Q)
            return 1;

    return 0;
}

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

    cin >> N >> P >> Q;

    for (int i = 1; i <= N; ++ i )
        cin >> A[i];
    sort(A+1, A+N+1);

    int st = 1, dr = 1e9;
    int ans = 0;

    while (st <= dr) {
        int mij = (st + dr) / 2;

        if (Check(mij)) {
            ans = mij;
            dr = mij - 1;
        }
        else st = mij + 1;
    }

    cout << ans << '\n';
    return 0;
}

Subtask #1
0 / 50.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 716 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Incorrect 73 ms 16024 KB Output isn't correct
2 Halted 0 ms 0 KB -