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Submission #161703

# Submission time Handle Problem Language Result Execution time Memory
161703 2019-11-03T19:17:37 Z jovan_b Watching (JOI13_watching) C++17
100 / 100
 264 ms 16220 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 2 ms 760 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 2 ms 376 KB Output is correct
4 Correct 3 ms 760 KB Output is correct
5 Correct 3 ms 760 KB Output is correct
6 Correct 3 ms 760 KB Output is correct
7 Correct 2 ms 760 KB Output is correct
8 Correct 2 ms 760 KB Output is correct
9 Correct 2 ms 760 KB Output is correct
10 Correct 3 ms 760 KB Output is correct
11 Correct 3 ms 760 KB Output is correct
12 Correct 3 ms 760 KB Output is correct
13 Correct 2 ms 768 KB Output is correct
14 Correct 2 ms 760 KB Output is correct
15 Correct 3 ms 764 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 10 ms 8440 KB Output is correct
2 Correct 2 ms 376 KB Output is correct
3 Correct 202 ms 16216 KB Output is correct
4 Correct 264 ms 16108 KB Output is correct
5 Correct 20 ms 8956 KB Output is correct
6 Correct 258 ms 16220 KB Output is correct
7 Correct 12 ms 8568 KB Output is correct
8 Correct 27 ms 9336 KB Output is correct
9 Correct 109 ms 14200 KB Output is correct
10 Correct 252 ms 15992 KB Output is correct
11 Correct 23 ms 9080 KB Output is correct
12 Correct 144 ms 16120 KB Output is correct
13 Correct 11 ms 8568 KB Output is correct
14 Correct 12 ms 8568 KB Output is correct
15 Correct 12 ms 8568 KB Output is correct