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Submission #503104

# Submission time Handle Problem Language Result Execution time Memory
503104 2022-01-07T09:14:04 Z colossal_pepe Watching (JOI13_watching) C++17
50 / 100
 1000 ms 40184 KB 
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;

int n, p, q;
vector<int> v;

int brutus(int w, int i, int p_left, vector<vector<int>> &dp) {
    if (i >= n) return 0;
    if (dp[i][p_left] != -1) return dp[i][p_left];
    int useq = lower_bound(v.begin(), v.end(), v[i] + (2 * w)) - v.begin();
    dp[i][p_left] = brutus(w, useq, p_left, dp) + 1;
    if (p_left) {
        int usep = lower_bound(v.begin(), v.end(), v[i] + w) - v.begin();
        dp[i][p_left] = min(dp[i][p_left], brutus(w, usep, p_left - 1, dp));
    }
    return dp[i][p_left];
}

int solve() {
    int minw = 1, maxw = 1e9;
    while (maxw - minw >= 5) {
        int mid = (maxw + minw) / 2;
        vector<vector<int>> dp(n, vector<int>(p + 1, -1));
        if (brutus(mid, 0, p, dp) <= q) maxw = mid;
        else minw = mid + 1;
    }
    for (int i = minw; i <= maxw; i++) {
        vector<vector<int>> dp(n, vector<int>(p + 1, -1));
        if (brutus(i, 0, p, dp) <= q) return i;
    }
    return 1e9;
}

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cin >> n >> p >> q;
    v.resize(n);
    for (int &i : v) {
        cin >> i;
    }
    sort(v.begin(), v.end());
    cout << solve() << endl;
    return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 256 KB Output is correct
2 Correct 1 ms 308 KB Output is correct
3 Correct 0 ms 204 KB Output is correct
4 Correct 430 ms 40140 KB Output is correct
5 Correct 1 ms 312 KB Output is correct
6 Correct 448 ms 40184 KB Output is correct
7 Correct 1 ms 204 KB Output is correct
8 Correct 1 ms 292 KB Output is correct
9 Correct 1 ms 204 KB Output is correct
10 Correct 2 ms 204 KB Output is correct
11 Correct 3 ms 204 KB Output is correct
12 Correct 3 ms 332 KB Output is correct
13 Correct 0 ms 204 KB Output is correct
14 Correct 1 ms 204 KB Output is correct
15 Correct 1 ms 204 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 332 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Execution timed out 1079 ms 12436 KB Time limit exceeded
4 Halted 0 ms 0 KB -