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Submission #472936

# Submission time Handle Problem Language Result Execution time Memory
472936 2021-09-14T15:23:18 Z Joo Watching (JOI13_watching) C++17
50 / 100
 1000 ms 15940 KB 
#include <bits/stdc++.h>
#define DEBUG false
using namespace std;

const int N = 2e3+10;
int n,P,Q,dp[N][N];

main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    cin >> n >> P >> Q;
    vector<int> a(n+1, 0);
    for(int i=1; i<=n; i++){
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    if(P+Q >= n){
        cout << "1\n";
        return 0;
    }

    int l = 1, r = 1e9, ans = -1, lim = min(P, Q), chk = max(P, Q);
    int code = (P < Q);

    while(l <= r){
        int mid = (l+r)/2;
        for(int i=1; i<=n; i++){
            for(int q=0, j; q<=lim; q++){
                dp[i][q] = 1e9;
                if(q > 0){
                    if(code == 0)
                        j = lower_bound(a.begin()+1, a.end(), a[i]-2*mid+1)-a.begin();
                    else
                        j = lower_bound(a.begin()+1, a.end(), a[i]-mid+1)-a.begin();
                    dp[i][q] = dp[j-1][q-1];
                }
                if(code == 0)
                    j = lower_bound(a.begin()+1, a.end(), a[i]-mid+1)-a.begin();
                else
                    j = lower_bound(a.begin()+1, a.end(), a[i]-2*mid+1)-a.begin();
                dp[i][q] = min(dp[i][q], dp[j-1][q]+1);
            }
        }

        if(dp[n][lim] <= chk){
            ans = mid;
            r = mid-1;
        }else{
            l = mid+1;
        }
    }
    cout << ans << "\n";
}

Compilation message

watching.cpp:8:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    8 | main(){
      | ^~~~

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 716 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 204 KB Output is correct
5 Correct 1 ms 204 KB Output is correct
6 Correct 1 ms 204 KB Output is correct
7 Correct 1 ms 716 KB Output is correct
8 Correct 1 ms 716 KB Output is correct
9 Correct 1 ms 716 KB Output is correct
10 Correct 2 ms 716 KB Output is correct
11 Correct 2 ms 716 KB Output is correct
12 Correct 4 ms 740 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
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 12 ms 8268 KB Output is correct
2 Correct 1 ms 204 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 332 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 332 KB Output is correct
7 Correct 33 ms 8468 KB Output is correct
8 Correct 223 ms 9200 KB Output is correct
9 Correct 222 ms 9292 KB Output is correct
10 Correct 162 ms 9008 KB Output is correct
11 Correct 175 ms 9036 KB Output is correct
12 Execution timed out 1083 ms 15940 KB Time limit exceeded
13 Halted 0 ms 0 KB -