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Submission #1015367

# Submission time Handle Problem Language Result Execution time Memory
1015367 2024-07-06T09:36:38 Z overwatch9 Watching (JOI13_watching) C++17
50 / 100
 1000 ms 15192 KB 
#include <bits/stdc++.h>
using namespace std;
int n;
vector <int> events;
vector <vector <int>> dp;
int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    int p, q;
    cin >> n >> p >> q;
    events = vector <int> (n+1);
    for (int i = 1; i <= n; i++)
        cin >> events[i];
    sort(events.begin(), events.end());
    if (p + q >= n) {
        cout << 1 << '\n';
        return 0;
    }
    dp = vector <vector <int>> (n+1, vector <int> (p+1, 1e9));
    int lo = 1, hi = 1e9;
    while (lo < hi) {
        int mid = lo + (hi - lo) / 2;
        dp[0][0] = 0;
        for (int i = 1; i <= n; i++) {
            for (int j = 0; j <= p; j++) {
                dp[i][j] = 1e9;
                if (j-1 >= 0)
                    dp[i][j] = dp[i][j-1];
                int it = upper_bound(events.begin(), events.end(), events[i] - 2*mid) - events.begin();
                dp[i][j] = min(dp[i][j], dp[max(0, it-1)][j] + 1); 
                if (j > 0) {
                    it = upper_bound(events.begin(), events.end(), events[i] - mid) - events.begin();
                    dp[i][j] = min(dp[i][j], dp[max(0, it-1)][j-1]);
                }
            }
        }
        if (dp[n][p] > q)
            lo = mid + 1;
        else
            hi = mid;
    }
    cout << lo << '\n';
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 0 ms 348 KB Output is correct
8 Correct 1 ms 348 KB Output is correct
9 Correct 1 ms 348 KB Output is correct
10 Correct 1 ms 348 KB Output is correct
11 Correct 4 ms 348 KB Output is correct
12 Correct 2 ms 348 KB Output is correct
13 Correct 1 ms 348 KB Output is correct
14 Correct 1 ms 348 KB Output is correct
15 Correct 1 ms 348 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 3 ms 344 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 348 KB Output is correct
4 Correct 1 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 15 ms 664 KB Output is correct
8 Correct 124 ms 1384 KB Output is correct
9 Correct 731 ms 6412 KB Output is correct
10 Execution timed out 1059 ms 15192 KB Time limit exceeded
11 Halted 0 ms 0 KB -