oj.uz

Submission #658017

# Submission time Handle Problem Language Result Execution time Memory
658017 2022-11-11T21:53:38 Z hail Watching (JOI13_watching) C++17
50 / 100
 1000 ms 11480 KB 
#include <bits/stdc++.h>
 
using namespace std;
 
#define vi vector<int>
#define vll vector<long long>
#define pb push_back
using ll= long long;
#define fast_io ios::sync_with_stdio(0); cin.tie(0)
#define inpint(x) int x; cin>>x
#define inpll(x) long long x; cin>>x
#define fl(i, n) for(int i=0; i<n; i++)
#define flo(i, n) for(int i=1; i<=n; i++)
#define int long long 
#define pi pair<int, int>
#define mp make_pair
#define ld long double
 
const int MOD = 7 + (int)1e9;
const int INF = (int)1e18;
 
//
 
int n, p, q;
int a[2005]{};
int dp[2005][2005];
 
bool check(int w)
{
    //p small q large
 
    for(int i=0; i<=p; i++)
    {
        for(int j=0; j<=q; j++)
        {
            dp[i][j] = 0;
            //check p, q-1 and p-1, q
            if(j-1>=0)
            {
                int x = dp[i][j-1];
                auto it = upper_bound(a+1, a+n+1, x);
                int y = *it;
                int z = y + (2*w) - 1;
                it = upper_bound(a+1, a+n+1, z);
                it--;
                int t = *it;
                dp[i][j] = max(dp[i][j], t);
            }
            if(i-1>=0)
            {
                int x = dp[i-1][j];
                auto it = upper_bound(a+1, a+n+1, x);
                int y = *it;
                int z = y + (w) - 1;
                it = upper_bound(a+1, a+n+1, z);
                it--;
                int t = *it;
                dp[i][j] = max(dp[i][j], t);   
            }
 
            if(dp[i][j]>=a[n]) return true;
        }
    }
 
    return false;
}
 
void solve()
{
    cin>>n>>p>>q;
 
    for(int i=1; i<=n; i++)
    {
        cin>>a[i];
    }
 
    sort(a+1, a+n+1);
 
    int low = 1;
    int high = 1000000000LL;
 
    if(p+q>=n)
    {
        cout<<1;
        return;
    }
 
    assert(p<=2000 && q<=2000);
 
    //assert(p<=2000 && q<=2000);
    int cnt = 0;
    while(high>low)
    {
        int mid = (high+low)/2;
        if(check(mid)) high = mid;
        else low = mid+1;
        cnt++;
        assert(cnt<40);
    }
 
    assert(high==low);
 
    cout<<high;
 
 
}
 
signed main()
{
    fast_io;
 
    int t=1; 
    //cin>>t;
    while(t--)
    {
        solve();
    }
    cout<<endl;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 328 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 0 ms 332 KB Output is correct
7 Correct 1 ms 340 KB Output is correct
8 Correct 1 ms 340 KB Output is correct
9 Correct 1 ms 340 KB Output is correct
10 Correct 2 ms 340 KB Output is correct
11 Correct 2 ms 468 KB Output is correct
12 Correct 3 ms 456 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 284 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 468 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 214 ms 1576 KB Output is correct
9 Correct 208 ms 4108 KB Output is correct
10 Correct 263 ms 9352 KB Output is correct
11 Correct 142 ms 1632 KB Output is correct
12 Execution timed out 1087 ms 11480 KB Time limit exceeded
13 Halted 0 ms 0 KB -