#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0); cout.tie(0);
int n; cin >> n;
int k; cin >> k;
int T; cin >> T; k--;
vector<int> v(n);
vector<ll> d(n);
auto check = [&](int m) {
for(int i = 0 ; i < n ; ++i)
d[i] = 2ll * T * i * m - v[i];
int pl = k, nl = k - 1;
int pr = k, nr = k + 1;
while (1) {
while (d[nl] > d[pl] && d[nl] <= d[pr] && nl > 0) nl--;
while (d[nr] < d[pr] && d[nr] >= d[pl] && nr < n - 1) nr++;
bool ok = 0;
if (nl >= 0 && d[nl] <= d[pl]) pl = nl--, ok = 1;
if (nr < n && d[nr] >= d[pr]) pr = nr++, ok = 1;
if(!ok) break;
}
if (nr < n && d[pl] > d[nr]) return false;
if (nl >= 0 && d[pr] < d[nl]) return false;
int l = 0; nl = 1;
int r = n - 1; nr = n - 2;
while (1) {
while (d[nl] > d[l] && d[nl] <= d[r] && nl < k) nl++;
while (d[nr] < d[r] && d[nr] >= d[l] && nr > k) nr--;
bool ok = 0;
if (nl <= k && d[nl] <= d[l]) l = nl++, ok = 1;
if (nr >= k && d[nr] >= d[r]) r = nr--, ok = 1;
if(!ok) break;
}
return pl <= l && r <= pr;
};
for(int&x : v)
cin >> x;
int l = 0;
int r = 1e9;
for(; l < r ;) {
int m = (l + r) / 2;
if (check(m))
r = m;
else
l = m + 1;
}
cout << l << endl;
}
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
376 KB |
Output is correct |
| 4 |
Correct |
2 ms |
376 KB |
Output is correct |
| 5 |
Correct |
2 ms |
376 KB |
Output is correct |
| 6 |
Correct |
2 ms |
376 KB |
Output is correct |
| 7 |
Correct |
2 ms |
376 KB |
Output is correct |
| 8 |
Correct |
2 ms |
376 KB |
Output is correct |
| 9 |
Correct |
2 ms |
376 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Correct |
2 ms |
348 KB |
Output is correct |
| 12 |
Correct |
2 ms |
376 KB |
Output is correct |
| 13 |
Correct |
2 ms |
376 KB |
Output is correct |
| 14 |
Correct |
2 ms |
376 KB |
Output is correct |
| 15 |
Correct |
2 ms |
376 KB |
Output is correct |
| 16 |
Correct |
2 ms |
376 KB |
Output is correct |
| 17 |
Correct |
2 ms |
376 KB |
Output is correct |
| 18 |
Correct |
2 ms |
376 KB |
Output is correct |
| 19 |
Correct |
2 ms |
376 KB |
Output is correct |
| 20 |
Correct |
2 ms |
376 KB |
Output is correct |
| 21 |
Correct |
2 ms |
376 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
376 KB |
Output is correct |
| 4 |
Correct |
2 ms |
376 KB |
Output is correct |
| 5 |
Correct |
2 ms |
376 KB |
Output is correct |
| 6 |
Correct |
2 ms |
376 KB |
Output is correct |
| 7 |
Correct |
2 ms |
376 KB |
Output is correct |
| 8 |
Correct |
2 ms |
376 KB |
Output is correct |
| 9 |
Correct |
2 ms |
376 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Correct |
2 ms |
348 KB |
Output is correct |
| 12 |
Correct |
2 ms |
376 KB |
Output is correct |
| 13 |
Correct |
2 ms |
376 KB |
Output is correct |
| 14 |
Correct |
2 ms |
376 KB |
Output is correct |
| 15 |
Correct |
2 ms |
376 KB |
Output is correct |
| 16 |
Correct |
2 ms |
376 KB |
Output is correct |
| 17 |
Correct |
2 ms |
376 KB |
Output is correct |
| 18 |
Correct |
2 ms |
376 KB |
Output is correct |
| 19 |
Correct |
2 ms |
376 KB |
Output is correct |
| 20 |
Correct |
2 ms |
376 KB |
Output is correct |
| 21 |
Correct |
2 ms |
376 KB |
Output is correct |
| 22 |
Correct |
2 ms |
376 KB |
Output is correct |
| 23 |
Correct |
2 ms |
376 KB |
Output is correct |
| 24 |
Correct |
2 ms |
376 KB |
Output is correct |
| 25 |
Correct |
2 ms |
376 KB |
Output is correct |
| 26 |
Correct |
2 ms |
376 KB |
Output is correct |
| 27 |
Correct |
2 ms |
376 KB |
Output is correct |
| 28 |
Correct |
2 ms |
504 KB |
Output is correct |
| 29 |
Correct |
2 ms |
376 KB |
Output is correct |
| 30 |
Correct |
2 ms |
376 KB |
Output is correct |
| 31 |
Correct |
2 ms |
376 KB |
Output is correct |
| 32 |
Correct |
2 ms |
376 KB |
Output is correct |
| 33 |
Correct |
2 ms |
376 KB |
Output is correct |
| 34 |
Correct |
2 ms |
376 KB |
Output is correct |
| 35 |
Correct |
2 ms |
376 KB |
Output is correct |
| 36 |
Correct |
2 ms |
376 KB |
Output is correct |
| 37 |
Correct |
2 ms |
376 KB |
Output is correct |
| 38 |
Correct |
3 ms |
376 KB |
Output is correct |
| 39 |
Correct |
2 ms |
376 KB |
Output is correct |
| 40 |
Correct |
2 ms |
376 KB |
Output is correct |
| # |
결과 |
실행 시간 |
메모리 |
Grader output |
| 1 |
Correct |
2 ms |
376 KB |
Output is correct |
| 2 |
Correct |
2 ms |
376 KB |
Output is correct |
| 3 |
Correct |
2 ms |
376 KB |
Output is correct |
| 4 |
Correct |
2 ms |
376 KB |
Output is correct |
| 5 |
Correct |
2 ms |
376 KB |
Output is correct |
| 6 |
Correct |
2 ms |
376 KB |
Output is correct |
| 7 |
Correct |
2 ms |
376 KB |
Output is correct |
| 8 |
Correct |
2 ms |
376 KB |
Output is correct |
| 9 |
Correct |
2 ms |
376 KB |
Output is correct |
| 10 |
Correct |
2 ms |
376 KB |
Output is correct |
| 11 |
Correct |
2 ms |
348 KB |
Output is correct |
| 12 |
Correct |
2 ms |
376 KB |
Output is correct |
| 13 |
Correct |
2 ms |
376 KB |
Output is correct |
| 14 |
Correct |
2 ms |
376 KB |
Output is correct |
| 15 |
Correct |
2 ms |
376 KB |
Output is correct |
| 16 |
Correct |
2 ms |
376 KB |
Output is correct |
| 17 |
Correct |
2 ms |
376 KB |
Output is correct |
| 18 |
Correct |
2 ms |
376 KB |
Output is correct |
| 19 |
Correct |
2 ms |
376 KB |
Output is correct |
| 20 |
Correct |
2 ms |
376 KB |
Output is correct |
| 21 |
Correct |
2 ms |
376 KB |
Output is correct |
| 22 |
Correct |
2 ms |
376 KB |
Output is correct |
| 23 |
Correct |
2 ms |
376 KB |
Output is correct |
| 24 |
Correct |
2 ms |
376 KB |
Output is correct |
| 25 |
Correct |
2 ms |
376 KB |
Output is correct |
| 26 |
Correct |
2 ms |
376 KB |
Output is correct |
| 27 |
Correct |
2 ms |
376 KB |
Output is correct |
| 28 |
Correct |
2 ms |
504 KB |
Output is correct |
| 29 |
Correct |
2 ms |
376 KB |
Output is correct |
| 30 |
Correct |
2 ms |
376 KB |
Output is correct |
| 31 |
Correct |
2 ms |
376 KB |
Output is correct |
| 32 |
Correct |
2 ms |
376 KB |
Output is correct |
| 33 |
Correct |
2 ms |
376 KB |
Output is correct |
| 34 |
Correct |
2 ms |
376 KB |
Output is correct |
| 35 |
Correct |
2 ms |
376 KB |
Output is correct |
| 36 |
Correct |
2 ms |
376 KB |
Output is correct |
| 37 |
Correct |
2 ms |
376 KB |
Output is correct |
| 38 |
Correct |
3 ms |
376 KB |
Output is correct |
| 39 |
Correct |
2 ms |
376 KB |
Output is correct |
| 40 |
Correct |
2 ms |
376 KB |
Output is correct |
| 41 |
Correct |
20 ms |
2040 KB |
Output is correct |
| 42 |
Correct |
3 ms |
376 KB |
Output is correct |
| 43 |
Correct |
7 ms |
760 KB |
Output is correct |
| 44 |
Correct |
26 ms |
2424 KB |
Output is correct |
| 45 |
Correct |
25 ms |
2552 KB |
Output is correct |
| 46 |
Correct |
27 ms |
2552 KB |
Output is correct |
| 47 |
Correct |
29 ms |
2556 KB |
Output is correct |
| 48 |
Correct |
26 ms |
2424 KB |
Output is correct |
| 49 |
Correct |
27 ms |
2552 KB |
Output is correct |
| 50 |
Correct |
26 ms |
2424 KB |
Output is correct |
| 51 |
Correct |
28 ms |
2552 KB |
Output is correct |
| 52 |
Correct |
26 ms |
2552 KB |
Output is correct |
| 53 |
Correct |
28 ms |
2564 KB |
Output is correct |
| 54 |
Correct |
27 ms |
2424 KB |
Output is correct |
| 55 |
Correct |
24 ms |
2424 KB |
Output is correct |
| 56 |
Correct |
26 ms |
2424 KB |
Output is correct |
| 57 |
Correct |
27 ms |
2552 KB |
Output is correct |
| 58 |
Correct |
27 ms |
2552 KB |
Output is correct |
| 59 |
Correct |
19 ms |
1784 KB |
Output is correct |
| 60 |
Correct |
26 ms |
2556 KB |
Output is correct |
| 61 |
Correct |
25 ms |
2424 KB |
Output is correct |
| 62 |
Correct |
25 ms |
2552 KB |
Output is correct |
| 63 |
Correct |
25 ms |
2552 KB |
Output is correct |
| 64 |
Correct |
28 ms |
2424 KB |
Output is correct |
| 65 |
Correct |
25 ms |
2496 KB |
Output is correct |
| 66 |
Correct |
25 ms |
2520 KB |
Output is correct |
| 67 |
Correct |
28 ms |
2548 KB |
Output is correct |
| 68 |
Correct |
26 ms |
2556 KB |
Output is correct |
| 69 |
Correct |
27 ms |
2552 KB |
Output is correct |
