oj.uz

Submission #986212

# Submission time Handle Problem Language Result Execution time Memory
986212 2024-05-20T05:42:38 Z Khanhcsp2 Watching (JOI13_watching) C++14
100 / 100
 245 ms 31832 KB 
#include <bits/stdc++.h>
#define el '\n'
#define fi first
#define sc second
#define int ll
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
using ll=long long;
using ull=unsigned long long;
using ld=long double;
const int mod=1e9+7;
const int N=2e3+11;
int n, x, y, a[N], dp[N][N];
bool check(int w)
{
    for(int i=1;i<=n;i++) for(int j=0;j<=x;j++) dp[i][j]=1e9;
    for(int i=0;i<=x;i++) dp[0][i]=0;
    for(int i=1;i<=n;i++)
    {
        int pos1=lower_bound(a+1, a+n+1, a[i]-w+1)-a;
        int pos2=lower_bound(a+1, a+n+1, a[i]-2*w+1)-a;
        dp[i][0]=min(dp[i][0], dp[pos2-1][0]+1);
        for(int j=1;j<=x;j++) dp[i][j]=min({dp[i][j], dp[pos1-1][j-1], dp[pos2-1][j]+1});
    }
    for(int i=0;i<=x;i++) if(dp[n][i]<=y) return 1;
    return 0;
}
void sol()
{
    cin >> n >> x >> y;
    for(int i=1;i<=n;i++) cin >> a[i];
    sort(a+1, a+n+1);
    if(n<=x+y)
    {
        cout << 1;
        return;
    }
    int l=1, r=1e9+11, ans=1e9+11;
    while(l<=r)
    {
        int mid=(l+r)/2;
        if(check(mid))
        {
            ans=min(ans, mid);
            r=mid-1;
        }
        else l=mid+1;
    }
    cout << ans;
}
signed main()
{
//    freopen("divisor.INP", "r", stdin);
//    freopen("divisor.OUT", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t=1;
    //cin >> t;
    while(t--)
    {
        sol();
    }
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 0 ms 348 KB Output is correct
4 Correct 0 ms 348 KB Output is correct
5 Correct 0 ms 348 KB Output is correct
6 Correct 0 ms 348 KB Output is correct
7 Correct 1 ms 2396 KB Output is correct
8 Correct 1 ms 2392 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 2396 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 21 ms 31324 KB Output is correct
2 Correct 0 ms 348 KB Output is correct
3 Correct 1 ms 344 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 8 ms 31324 KB Output is correct
8 Correct 20 ms 31496 KB Output is correct
9 Correct 97 ms 31692 KB Output is correct
10 Correct 245 ms 31832 KB Output is correct
11 Correct 17 ms 31324 KB Output is correct
12 Correct 139 ms 31580 KB Output is correct
13 Correct 12 ms 31320 KB Output is correct
14 Correct 12 ms 31320 KB Output is correct
15 Correct 12 ms 31324 KB Output is correct