oj.uz

Submission #907507

# Submission time Handle Problem Language Result Execution time Memory
907507 2024-01-15T18:16:39 Z typ_ik Watching (JOI13_watching) C++17
100 / 100
 289 ms 19096 KB 
#include <bits/stdc++.h>

#define ll long long
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define watch(x) cout << (#x) << " : " << x << '\n'
#define boost ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)

using namespace std;  

const int N = 2222;
const int INF = 2e9 + 128;
int dp[N][N]; 
int a[N];

void solve() { 
    int n, p, q;
    cin >> n >> p >> q;
    for (int i = 1; i <= n; i++)
        cin >> a[i];

    sort(a + 1, a + n + 1);
    
    if (p + q >= n) {
        cout << 1 << '\n';
        return;
    } 

    auto check = [&](int w) -> bool {   
        for (int i = 0; i <= n+2; i++)
            for (int c = 0; c <= p+2; c++)    
                dp[i][c] = INF;
        for (int i = 0; i <= p; i++) 
            dp[0][i] = 0;

        int j0 = 0, j1 = 0; 

        for (int i = 1; i <= n; i++) {
            // place w.
            while (j0 + 1 <= n && a[j0 + 1] - a[i] + 1 <= w)
                j0++;
            while (j1 + 1 <= n && a[j1 + 1] - a[i] + 1 <= 2*w)
                j1++;  

            for (int lp = 0; lp <= p; lp++)
                dp[j0][lp] = min(dp[j0][lp], dp[i-1][lp+1]);
            
            for (int lp = 0; lp <= p; lp++)
                dp[j1][lp] = min(dp[j1][lp], dp[i-1][lp]+1); 
        }  

        for (int i = 0; i <= p; i++)
            if (dp[n][i] <= q)
                return true;

        return false; 
    };   

    int l = 0, r = 1e9 + 128;
    while (l + 1 < r) {
        int m = (l + r) >> 1;
        if (check(m))
            r = m;
        else 
            l = m;
    }

    cout << r << '\n';
}

main() { 
    boost;  
    solve();
    return 0;
}

Compilation message

watching.cpp:71:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
   71 | main() {
      | ^~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2396 KB Output is correct
2 Correct 1 ms 348 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 600 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2396 KB Output is correct
9 Correct 1 ms 2396 KB Output is correct
10 Correct 1 ms 2396 KB Output is correct
11 Correct 1 ms 2396 KB Output is correct
12 Correct 1 ms 2396 KB Output is correct
13 Correct 1 ms 2392 KB Output is correct
14 Correct 1 ms 2396 KB Output is correct
15 Correct 1 ms 2396 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 19032 KB Output is correct
2 Correct 1 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 1 ms 348 KB Output is correct
6 Correct 1 ms 348 KB Output is correct
7 Correct 6 ms 19036 KB Output is correct
8 Correct 21 ms 19036 KB Output is correct
9 Correct 113 ms 19036 KB Output is correct
10 Correct 289 ms 19036 KB Output is correct
11 Correct 16 ms 19036 KB Output is correct
12 Correct 180 ms 19096 KB Output is correct
13 Correct 6 ms 19036 KB Output is correct
14 Correct 6 ms 19036 KB Output is correct
15 Correct 6 ms 19036 KB Output is correct