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Submission #461988

# Submission time Handle Problem Language Result Execution time Memory
461988 2021-08-10T06:58:18 Z nickyrio Watching (JOI13_watching) C++17
50 / 100
 1000 ms 16332 KB 
#include <bits/stdc++.h>

using namespace std;

const int N = 2020;
int n, p, q, a[N];

int dp[N][N];
void Max(int &a, int b) { a = (a < b ? b : a); }

bool Check(int w) {
    memset(dp, 0, sizeof dp);
    int total = min(n, p + q);
    for (int i = 0; i < total; ++i) {
        for (int np = 0; np <= min(i, p); ++np) {
            int x = dp[i][np];
            int nq = i - np;
            if (x == n) {
                return true;
            }
            if (np < p) {
                int nxt = lower_bound(a, a + n, a[x] + w) - a;
                Max(dp[i + 1][np + 1], nxt);
            }
            if (nq < q) {
                int nxt = lower_bound(a, a + n, a[x] + w + w) - a;
                Max(dp[i + 1][np], nxt);
            }
        }
    }
    return dp[total][p] >= n;
}
int main() {
    ios::sync_with_stdio(false); cin.tie(NULL);
    cin >> n >> p >> q;
    p = min(p, n), q = min(q, n);
    for (int i = 0; i < n; ++i) cin >> a[i];
    sort(a, a + n);
    int l = 0, r = 1e9, cur = -1;
    while (l <= r) {
        int mid = (l + r) >> 1;
        if (Check(mid)) {
            cur = mid;
            r = mid - 1;
        } else l = mid + 1;
    }
    cout << cur << '\n';
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 61 ms 16204 KB Output is correct
2 Correct 62 ms 16228 KB Output is correct
3 Correct 66 ms 16196 KB Output is correct
4 Correct 68 ms 16264 KB Output is correct
5 Correct 63 ms 16268 KB Output is correct
6 Correct 70 ms 16204 KB Output is correct
7 Correct 67 ms 16312 KB Output is correct
8 Correct 63 ms 16268 KB Output is correct
9 Correct 65 ms 16332 KB Output is correct
10 Correct 65 ms 16204 KB Output is correct
11 Correct 63 ms 16164 KB Output is correct
12 Correct 67 ms 16268 KB Output is correct
13 Correct 64 ms 16204 KB Output is correct
14 Correct 63 ms 16192 KB Output is correct
15 Correct 62 ms 16204 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 65 ms 16204 KB Output is correct
2 Correct 60 ms 16272 KB Output is correct
3 Correct 906 ms 16296 KB Output is correct
4 Execution timed out 1076 ms 16204 KB Time limit exceeded
5 Halted 0 ms 0 KB -