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Submission #635245

# Submission time Handle Problem Language Result Execution time Memory
635245 2022-08-25T17:49:47 Z Ronin13 Watching (JOI13_watching) C++14
100 / 100
 244 ms 15992 KB 
#include<bits/stdc++.h>
#define ll long long
#define ull unsigned ll
#define f first
#define s second
#define pii pair<int,int>
#define pll pair<ll,ll>
#define pb push_back
#define epb emplace_back
using namespace std;

const int NMAX = 2e5 + 1;

int a[NMAX];

bool slv(int w, int n, int p, int q){
    int dp[n + 1][n + 1];
    for(int i = 0; i <= n; i++){
        for(int j = 0; j <= n; j++){
            i == 0 ? dp[i][j] = 0 : dp[i][j] = q + 1;
        }
    }
    int ind1, ind2;
    ind1 = ind2 = 0;
    for(int i = 1; i <= n; i++){
        while(a[i] - a[ind1] >= w) ind1++;
        while(a[i] - a[ind2] >= 2 * w) ind2++;
        for(int j = 0; j <= n; j++){
            dp[i][j] = dp[ind2 - 1][j] + 1;
            if(j) dp[i][j] = min(dp[i][j], dp[ind1 - 1][j - 1]);
        }
    }
    return dp[n][p] <= q;
}

int main(){
    int n; cin >> n;
    int p, q; cin >> p >> q;
    for(int i = 1; i <= n; i++) cin >> a[i];
    a[0] = -1e9;
    sort(a + 1, a + 1 + n);
    if(p + q >= n){
        cout << 1 << "\n";
        return 0;
    }
    int l = 0, r = 1e9 + 5;
    while(l + 1 < r){
        int mid = (l + r) / 2;
        if(slv(mid, n, p, q)) r= mid;
        else l = mid;
    }
    cout << r;
    return 0;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 308 KB Output is correct
2 Correct 0 ms 212 KB Output is correct
3 Correct 1 ms 212 KB Output is correct
4 Correct 0 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 2 ms 340 KB Output is correct
9 Correct 1 ms 312 KB Output is correct
10 Correct 1 ms 340 KB Output is correct
11 Correct 2 ms 340 KB Output is correct
12 Correct 1 ms 340 KB Output is correct
13 Correct 1 ms 340 KB Output is correct
14 Correct 1 ms 340 KB Output is correct
15 Correct 1 ms 340 KB Output is correct

Subtask #2
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 198 ms 15956 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 332 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 320 KB Output is correct
6 Correct 2 ms 340 KB Output is correct
7 Correct 223 ms 15980 KB Output is correct
8 Correct 195 ms 15980 KB Output is correct
9 Correct 198 ms 15980 KB Output is correct
10 Correct 196 ms 15956 KB Output is correct
11 Correct 219 ms 15988 KB Output is correct
12 Correct 201 ms 15956 KB Output is correct
13 Correct 193 ms 15988 KB Output is correct
14 Correct 200 ms 15984 KB Output is correct
15 Correct 244 ms 15992 KB Output is correct