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Submission #442044

# Submission time Handle Problem Language Result Execution time Memory
442044 2021-07-06T20:49:09 Z JovanB Watching (JOI13_watching) C++17
100 / 100
 221 ms 16028 KB 
#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef long double ld;
 
int n, p, q;
int event[2005];
int dp[2005][2005];
 
bool check(int w){
    int small = 0, large = 0;
    for(int i=1; i<=n; i++){
        while(event[i]-event[small+1] >= w) small++;
        while(event[i]-event[large+1] >= 2*w) large++;
        for(int j=0; j<=p; j++){
            dp[i][j] = n+5;
            if(j) dp[i][j] = min(dp[i][j], dp[small][j-1]);
            dp[i][j] = min(dp[i][j], dp[large][j] + 1);
        }
    }
    //if(w == 3) cout << dp[n][p] << " " << q << endl;
    return dp[n][p] <= q;
}
 
int main(){
    ios_base::sync_with_stdio(false), cin.tie(0);
    cout.precision(10);
    cout << fixed;
 
    cin >> n >> p >> q;
    p = min(p, n);
    q = min(q, n);
    for(int i=1; i<=n; i++){
        cin >> event[i];
    }
    sort(event+1, event+1+n);
    int l = 1, r = 1e9, res = 1e9;
    while(l <= r){
        int mid = (l+r)/2;
        if(check(mid)){
            r = mid-1;
            res = mid;
        }
        else l = mid+1;
    }
    cout << res;
    return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 0 ms 204 KB Output is correct
3 Correct 1 ms 316 KB Output is correct
4 Correct 1 ms 716 KB Output is correct
5 Correct 1 ms 716 KB Output is correct
6 Correct 2 ms 716 KB Output is correct
7 Correct 1 ms 704 KB Output is correct
8 Correct 1 ms 716 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 1 ms 716 KB Output is correct
11 Correct 1 ms 716 KB Output is correct
12 Correct 1 ms 716 KB Output is correct
13 Correct 1 ms 716 KB Output is correct
14 Correct 1 ms 716 KB Output is correct
15 Correct 1 ms 716 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8268 KB Output is correct
2 Correct 0 ms 332 KB Output is correct
3 Correct 171 ms 15968 KB Output is correct
4 Correct 218 ms 16028 KB Output is correct
5 Correct 14 ms 8904 KB Output is correct
6 Correct 217 ms 16028 KB Output is correct
7 Correct 7 ms 8396 KB Output is correct
8 Correct 20 ms 9292 KB Output is correct
9 Correct 93 ms 14196 KB Output is correct
10 Correct 221 ms 16024 KB Output is correct
11 Correct 15 ms 9036 KB Output is correct
12 Correct 120 ms 16008 KB Output is correct
13 Correct 6 ms 8396 KB Output is correct
14 Correct 7 ms 8496 KB Output is correct
15 Correct 7 ms 8396 KB Output is correct