#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ii pair<ll,ll>
#define fi first
#define se second
#define endl '\n'
#define puf push_front
#define pof pop_front
#define pub push_back
#define pob pop_back
#define lb lower_bound
#define ub upper_bound
#define rep(x,s,e) for (auto x=s-(s>e);x!=e-(s>e);s<e?x++:x--)
#define all(x) (x).begin(),(x).end()
#define sz(x) (int) (x).size()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n,k,t;
ll arr[100005];
ii memo[1005][1005];
bool can(ll i){
rep(x,0,1005) rep(y,0,1005) memo[x][y]=ii(1e10,-1e10);
memo[k][k]=ii(arr[k]-i,arr[k]+i);
rep(x,0,n-1){
rep(y,1,n-x+1){
int l=y,r=y+x;
ii temp=memo[l][r];
temp.fi=max(temp.fi,arr[l-1]-(x+1)*i);
temp.se=min(temp.se,arr[l-1]+(x+1)*i);
if (temp.fi<=temp.se){
memo[l-1][r].fi=min(memo[l-1][r].fi,temp.fi-i);
memo[l-1][r].se=max(memo[l-1][r].se,temp.se+i);
}
temp=memo[l][r];
temp.fi=max(temp.fi,arr[r+1]-(x+1)*i);
temp.se=min(temp.se,arr[r+1]+(x+1)*i);
if (temp.fi<=temp.se){
memo[l][r+1].fi=min(memo[l][r+1].fi,temp.fi-i);
memo[l][r+1].se=max(memo[l][r+1].se,temp.se+i);
}
}
}
return memo[1][n].fi<=memo[1][n].se;
}
int main(){
cin.tie(0);
cout.tie(0);
cin.sync_with_stdio(false);
cin>>n>>k>>t;
rep(x,1,n+1) cin>>arr[x];
ll lo=0,hi=1e9,mi;
while (hi-lo>1){
mi=hi+lo>>1;
if (can(mi)) hi=mi;
else lo=mi;
}
cout<<(hi+t-1)/t<<endl;
}
Compilation message
sparklers.cpp: In function 'int main()':
sparklers.cpp:69:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
69 | mi=hi+lo>>1;
| ~~^~~
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
72 ms |
16076 KB |
Output is correct |
2 |
Correct |
70 ms |
16052 KB |
Output is correct |
3 |
Correct |
71 ms |
16116 KB |
Output is correct |
4 |
Correct |
68 ms |
16116 KB |
Output is correct |
5 |
Correct |
66 ms |
16076 KB |
Output is correct |
6 |
Correct |
65 ms |
16076 KB |
Output is correct |
7 |
Correct |
66 ms |
16076 KB |
Output is correct |
8 |
Correct |
73 ms |
16116 KB |
Output is correct |
9 |
Correct |
70 ms |
16116 KB |
Output is correct |
10 |
Correct |
69 ms |
16116 KB |
Output is correct |
11 |
Correct |
69 ms |
16116 KB |
Output is correct |
12 |
Correct |
69 ms |
16120 KB |
Output is correct |
13 |
Correct |
68 ms |
16076 KB |
Output is correct |
14 |
Correct |
67 ms |
16076 KB |
Output is correct |
15 |
Correct |
68 ms |
16120 KB |
Output is correct |
16 |
Correct |
70 ms |
16084 KB |
Output is correct |
17 |
Correct |
68 ms |
16116 KB |
Output is correct |
18 |
Correct |
64 ms |
16116 KB |
Output is correct |
19 |
Incorrect |
67 ms |
16112 KB |
Output isn't correct |
20 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
72 ms |
16076 KB |
Output is correct |
2 |
Correct |
70 ms |
16052 KB |
Output is correct |
3 |
Correct |
71 ms |
16116 KB |
Output is correct |
4 |
Correct |
68 ms |
16116 KB |
Output is correct |
5 |
Correct |
66 ms |
16076 KB |
Output is correct |
6 |
Correct |
65 ms |
16076 KB |
Output is correct |
7 |
Correct |
66 ms |
16076 KB |
Output is correct |
8 |
Correct |
73 ms |
16116 KB |
Output is correct |
9 |
Correct |
70 ms |
16116 KB |
Output is correct |
10 |
Correct |
69 ms |
16116 KB |
Output is correct |
11 |
Correct |
69 ms |
16116 KB |
Output is correct |
12 |
Correct |
69 ms |
16120 KB |
Output is correct |
13 |
Correct |
68 ms |
16076 KB |
Output is correct |
14 |
Correct |
67 ms |
16076 KB |
Output is correct |
15 |
Correct |
68 ms |
16120 KB |
Output is correct |
16 |
Correct |
70 ms |
16084 KB |
Output is correct |
17 |
Correct |
68 ms |
16116 KB |
Output is correct |
18 |
Correct |
64 ms |
16116 KB |
Output is correct |
19 |
Incorrect |
67 ms |
16112 KB |
Output isn't correct |
20 |
Halted |
0 ms |
0 KB |
- |
# |
결과 |
실행 시간 |
메모리 |
Grader output |
1 |
Correct |
72 ms |
16076 KB |
Output is correct |
2 |
Correct |
70 ms |
16052 KB |
Output is correct |
3 |
Correct |
71 ms |
16116 KB |
Output is correct |
4 |
Correct |
68 ms |
16116 KB |
Output is correct |
5 |
Correct |
66 ms |
16076 KB |
Output is correct |
6 |
Correct |
65 ms |
16076 KB |
Output is correct |
7 |
Correct |
66 ms |
16076 KB |
Output is correct |
8 |
Correct |
73 ms |
16116 KB |
Output is correct |
9 |
Correct |
70 ms |
16116 KB |
Output is correct |
10 |
Correct |
69 ms |
16116 KB |
Output is correct |
11 |
Correct |
69 ms |
16116 KB |
Output is correct |
12 |
Correct |
69 ms |
16120 KB |
Output is correct |
13 |
Correct |
68 ms |
16076 KB |
Output is correct |
14 |
Correct |
67 ms |
16076 KB |
Output is correct |
15 |
Correct |
68 ms |
16120 KB |
Output is correct |
16 |
Correct |
70 ms |
16084 KB |
Output is correct |
17 |
Correct |
68 ms |
16116 KB |
Output is correct |
18 |
Correct |
64 ms |
16116 KB |
Output is correct |
19 |
Incorrect |
67 ms |
16112 KB |
Output isn't correct |
20 |
Halted |
0 ms |
0 KB |
- |