oj.uz

Submission #200623

# Submission time Handle Problem Language Result Execution time Memory
200623 2020-02-07T16:18:27 Z gs18115 Sparklers (JOI17_sparklers) C++14
50 / 100
 42 ms 4724 KB 
#include<iostream>
#include<vector>
#include<algorithm>
#define ep emplace
#define eb emplace_back
#define fi first
#define se second
#define all(x) (x).begin(),(x).end()
#define semicolon ;
#define ryan bear
using namespace std;
typedef long long ll;
typedef pair<int,int>pi;
typedef pair<ll,ll>pl;
const int inf=1e9+7;
const ll INF=1e18;
int n,k;
ll x[100010];
bool dp[1010][1010];
inline bool able(ll s)
{
    for(int i=0;i<n;i++)
        dp[i][i]=i==k-1?1:0;
    for(int l=1;l<n;l++)
    {
        for(int i=0;i+l<n;i++)
        {
            int j=i+l;
            dp[i][j]=(dp[i+1][j]||dp[i][j-1])&&x[i]+s*l>=x[j]-s*l;
        }
    }
    return dp[0][n-1];
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    ll t;
    cin>>n>>k>>t;
    for(int i=0;i<n;i++)
        cin>>x[i];
    ll s=0;
    ll e=inf;
    while(s<e)
    {
        ll m=s+e>>1;
        if(able(m))
            e=m;
        else
            s=m+1;
    }
    cout<<(s+t-1)/t<<endl;
    return 0;
}

Compilation message

sparklers.cpp: In function 'int main()':
sparklers.cpp:46:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
         ll m=s+e>>1;
              ~^~

Subtask #1
30.0 / 30.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 6 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 5 ms 376 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 5 ms 376 KB Output is correct
20 Correct 5 ms 376 KB Output is correct
21 Correct 5 ms 376 KB Output is correct

Subtask #2
20.0 / 20.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 6 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 5 ms 376 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 5 ms 376 KB Output is correct
20 Correct 5 ms 376 KB Output is correct
21 Correct 5 ms 376 KB Output is correct
22 Correct 26 ms 1028 KB Output is correct
23 Correct 15 ms 888 KB Output is correct
24 Correct 21 ms 1016 KB Output is correct
25 Correct 42 ms 1528 KB Output is correct
26 Correct 37 ms 1396 KB Output is correct
27 Correct 35 ms 1400 KB Output is correct
28 Correct 36 ms 1400 KB Output is correct
29 Correct 36 ms 1400 KB Output is correct
30 Correct 33 ms 1400 KB Output is correct
31 Correct 37 ms 1400 KB Output is correct
32 Correct 36 ms 1400 KB Output is correct
33 Correct 39 ms 1272 KB Output is correct
34 Correct 37 ms 1400 KB Output is correct
35 Correct 36 ms 1400 KB Output is correct
36 Correct 40 ms 1272 KB Output is correct
37 Correct 36 ms 1400 KB Output is correct
38 Correct 35 ms 1400 KB Output is correct
39 Correct 37 ms 1400 KB Output is correct
40 Correct 34 ms 1400 KB Output is correct

Subtask #3
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 5 ms 376 KB Output is correct
2 Correct 5 ms 376 KB Output is correct
3 Correct 5 ms 376 KB Output is correct
4 Correct 6 ms 376 KB Output is correct
5 Correct 5 ms 376 KB Output is correct
6 Correct 5 ms 376 KB Output is correct
7 Correct 5 ms 376 KB Output is correct
8 Correct 5 ms 376 KB Output is correct
9 Correct 5 ms 376 KB Output is correct
10 Correct 5 ms 376 KB Output is correct
11 Correct 5 ms 376 KB Output is correct
12 Correct 5 ms 376 KB Output is correct
13 Correct 5 ms 376 KB Output is correct
14 Correct 5 ms 376 KB Output is correct
15 Correct 5 ms 376 KB Output is correct
16 Correct 5 ms 376 KB Output is correct
17 Correct 5 ms 376 KB Output is correct
18 Correct 5 ms 504 KB Output is correct
19 Correct 5 ms 376 KB Output is correct
20 Correct 5 ms 376 KB Output is correct
21 Correct 5 ms 376 KB Output is correct
22 Correct 26 ms 1028 KB Output is correct
23 Correct 15 ms 888 KB Output is correct
24 Correct 21 ms 1016 KB Output is correct
25 Correct 42 ms 1528 KB Output is correct
26 Correct 37 ms 1396 KB Output is correct
27 Correct 35 ms 1400 KB Output is correct
28 Correct 36 ms 1400 KB Output is correct
29 Correct 36 ms 1400 KB Output is correct
30 Correct 33 ms 1400 KB Output is correct
31 Correct 37 ms 1400 KB Output is correct
32 Correct 36 ms 1400 KB Output is correct
33 Correct 39 ms 1272 KB Output is correct
34 Correct 37 ms 1400 KB Output is correct
35 Correct 36 ms 1400 KB Output is correct
36 Correct 40 ms 1272 KB Output is correct
37 Correct 36 ms 1400 KB Output is correct
38 Correct 35 ms 1400 KB Output is correct
39 Correct 37 ms 1400 KB Output is correct
40 Correct 34 ms 1400 KB Output is correct
41 Runtime error 19 ms 4724 KB Execution killed with signal 11 (could be triggered by violating memory limits)
42 Halted 0 ms 0 KB -