#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
typedef long double ld;
const int MOD = (int)1e9 + 7;
const int MAXN = (int)1e5 + 3;
const int infint = (int)1e9 + 3;
const ll inf = (ll)2e18;
int n, k, t;
int X[MAXN];
bool make(vector < ld > x, vector < ld > y)
{
if (x[0] < y[0])
return 0;
int ok = 1;
pair<int, int> L, R;
L = {0, 0};
R = {0, 0};
while (ok)
{
ok = 0;
while (L.first + 1 < x.size() && x[L.first + 1] >= y[R.second])
{
ok = 1;
if (x[++L.first] > x[L.second])
L.second = L.first;
}
while (R.first + 1 < y.size() && y[R.first + 1] <= x[L.second])
{
ok = 1;
if (y[++R.first] < y[R.second])
R.second = R.first;
}
}
return L.first + 1 == x.size() && R.first + 1 == y.size();
}
bool check(int s)
{
vector <ld> x, y;
for (ll i = k; i >= 0; i--)
x.push_back(X[i] - (ld)2 * s * t * i);
for (ll i = k; i < n; i++)
y.push_back(X[i] - (ld)2 * s * t * i);
if (!make(x, y))
return 0;
reverse(x.begin(), x.end());
reverse(y.begin(), y.end());
if (!make(x, y))
return 0;
return 1;
}
int main()
{
ios::sync_with_stdio(false);
cin.tie(0); cout.tie(0);
cin >> n >> k >> t;
k--;
for (ll i = 0; i < n; i++)
cin >> X[i];
int L = 0, R = infint;
while (L < R)
{
ll mid = (L + R) >> 1;
if (check(mid))
R = mid;
else
L = mid + 1;
}
cout << L;
}
Compilation message
sparklers.cpp: In function 'bool make(std::vector<long double>, std::vector<long double>)':
sparklers.cpp:23:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while (L.first + 1 < x.size() && x[L.first + 1] >= y[R.second])
~~~~~~~~~~~~^~~~~~~~~~
sparklers.cpp:29:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
while (R.first + 1 < y.size() && y[R.first + 1] <= x[L.second])
~~~~~~~~~~~~^~~~~~~~~~
sparklers.cpp:36:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
return L.first + 1 == x.size() && R.first + 1 == y.size();
~~~~~~~~~~~~^~~~~~~~~~~
sparklers.cpp:36:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
return L.first + 1 == x.size() && R.first + 1 == y.size();
~~~~~~~~~~~~^~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
2 ms |
384 KB |
Output is correct |
| 4 |
Correct |
2 ms |
384 KB |
Output is correct |
| 5 |
Correct |
2 ms |
384 KB |
Output is correct |
| 6 |
Correct |
2 ms |
384 KB |
Output is correct |
| 7 |
Correct |
2 ms |
384 KB |
Output is correct |
| 8 |
Correct |
2 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
512 KB |
Output is correct |
| 10 |
Correct |
2 ms |
384 KB |
Output is correct |
| 11 |
Correct |
2 ms |
384 KB |
Output is correct |
| 12 |
Correct |
2 ms |
384 KB |
Output is correct |
| 13 |
Correct |
2 ms |
384 KB |
Output is correct |
| 14 |
Correct |
2 ms |
384 KB |
Output is correct |
| 15 |
Correct |
2 ms |
384 KB |
Output is correct |
| 16 |
Correct |
2 ms |
384 KB |
Output is correct |
| 17 |
Correct |
2 ms |
384 KB |
Output is correct |
| 18 |
Correct |
2 ms |
384 KB |
Output is correct |
| 19 |
Correct |
2 ms |
384 KB |
Output is correct |
| 20 |
Correct |
2 ms |
384 KB |
Output is correct |
| 21 |
Correct |
2 ms |
384 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
2 ms |
384 KB |
Output is correct |
| 4 |
Correct |
2 ms |
384 KB |
Output is correct |
| 5 |
Correct |
2 ms |
384 KB |
Output is correct |
| 6 |
Correct |
2 ms |
384 KB |
Output is correct |
| 7 |
Correct |
2 ms |
384 KB |
Output is correct |
| 8 |
Correct |
2 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
512 KB |
Output is correct |
| 10 |
Correct |
2 ms |
384 KB |
Output is correct |
| 11 |
Correct |
2 ms |
384 KB |
Output is correct |
| 12 |
Correct |
2 ms |
384 KB |
Output is correct |
| 13 |
Correct |
2 ms |
384 KB |
Output is correct |
| 14 |
Correct |
2 ms |
384 KB |
Output is correct |
| 15 |
Correct |
2 ms |
384 KB |
Output is correct |
| 16 |
Correct |
2 ms |
384 KB |
Output is correct |
| 17 |
Correct |
2 ms |
384 KB |
Output is correct |
| 18 |
Correct |
2 ms |
384 KB |
Output is correct |
| 19 |
Correct |
2 ms |
384 KB |
Output is correct |
| 20 |
Correct |
2 ms |
384 KB |
Output is correct |
| 21 |
Correct |
2 ms |
384 KB |
Output is correct |
| 22 |
Correct |
3 ms |
384 KB |
Output is correct |
| 23 |
Correct |
3 ms |
384 KB |
Output is correct |
| 24 |
Correct |
3 ms |
384 KB |
Output is correct |
| 25 |
Correct |
3 ms |
384 KB |
Output is correct |
| 26 |
Correct |
3 ms |
384 KB |
Output is correct |
| 27 |
Correct |
26 ms |
384 KB |
Output is correct |
| 28 |
Correct |
3 ms |
384 KB |
Output is correct |
| 29 |
Correct |
2 ms |
384 KB |
Output is correct |
| 30 |
Correct |
3 ms |
384 KB |
Output is correct |
| 31 |
Correct |
3 ms |
384 KB |
Output is correct |
| 32 |
Correct |
3 ms |
384 KB |
Output is correct |
| 33 |
Correct |
3 ms |
384 KB |
Output is correct |
| 34 |
Correct |
3 ms |
384 KB |
Output is correct |
| 35 |
Correct |
3 ms |
384 KB |
Output is correct |
| 36 |
Correct |
3 ms |
384 KB |
Output is correct |
| 37 |
Correct |
4 ms |
384 KB |
Output is correct |
| 38 |
Correct |
3 ms |
384 KB |
Output is correct |
| 39 |
Correct |
3 ms |
384 KB |
Output is correct |
| 40 |
Correct |
3 ms |
384 KB |
Output is correct |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
2 ms |
384 KB |
Output is correct |
| 2 |
Correct |
2 ms |
384 KB |
Output is correct |
| 3 |
Correct |
2 ms |
384 KB |
Output is correct |
| 4 |
Correct |
2 ms |
384 KB |
Output is correct |
| 5 |
Correct |
2 ms |
384 KB |
Output is correct |
| 6 |
Correct |
2 ms |
384 KB |
Output is correct |
| 7 |
Correct |
2 ms |
384 KB |
Output is correct |
| 8 |
Correct |
2 ms |
384 KB |
Output is correct |
| 9 |
Correct |
4 ms |
512 KB |
Output is correct |
| 10 |
Correct |
2 ms |
384 KB |
Output is correct |
| 11 |
Correct |
2 ms |
384 KB |
Output is correct |
| 12 |
Correct |
2 ms |
384 KB |
Output is correct |
| 13 |
Correct |
2 ms |
384 KB |
Output is correct |
| 14 |
Correct |
2 ms |
384 KB |
Output is correct |
| 15 |
Correct |
2 ms |
384 KB |
Output is correct |
| 16 |
Correct |
2 ms |
384 KB |
Output is correct |
| 17 |
Correct |
2 ms |
384 KB |
Output is correct |
| 18 |
Correct |
2 ms |
384 KB |
Output is correct |
| 19 |
Correct |
2 ms |
384 KB |
Output is correct |
| 20 |
Correct |
2 ms |
384 KB |
Output is correct |
| 21 |
Correct |
2 ms |
384 KB |
Output is correct |
| 22 |
Correct |
3 ms |
384 KB |
Output is correct |
| 23 |
Correct |
3 ms |
384 KB |
Output is correct |
| 24 |
Correct |
3 ms |
384 KB |
Output is correct |
| 25 |
Correct |
3 ms |
384 KB |
Output is correct |
| 26 |
Correct |
3 ms |
384 KB |
Output is correct |
| 27 |
Correct |
26 ms |
384 KB |
Output is correct |
| 28 |
Correct |
3 ms |
384 KB |
Output is correct |
| 29 |
Correct |
2 ms |
384 KB |
Output is correct |
| 30 |
Correct |
3 ms |
384 KB |
Output is correct |
| 31 |
Correct |
3 ms |
384 KB |
Output is correct |
| 32 |
Correct |
3 ms |
384 KB |
Output is correct |
| 33 |
Correct |
3 ms |
384 KB |
Output is correct |
| 34 |
Correct |
3 ms |
384 KB |
Output is correct |
| 35 |
Correct |
3 ms |
384 KB |
Output is correct |
| 36 |
Correct |
3 ms |
384 KB |
Output is correct |
| 37 |
Correct |
4 ms |
384 KB |
Output is correct |
| 38 |
Correct |
3 ms |
384 KB |
Output is correct |
| 39 |
Correct |
3 ms |
384 KB |
Output is correct |
| 40 |
Correct |
3 ms |
384 KB |
Output is correct |
| 41 |
Correct |
90 ms |
3956 KB |
Output is correct |
| 42 |
Correct |
5 ms |
568 KB |
Output is correct |
| 43 |
Correct |
25 ms |
1344 KB |
Output is correct |
| 44 |
Correct |
132 ms |
5456 KB |
Output is correct |
| 45 |
Correct |
138 ms |
5376 KB |
Output is correct |
| 46 |
Correct |
139 ms |
5528 KB |
Output is correct |
| 47 |
Correct |
149 ms |
5464 KB |
Output is correct |
| 48 |
Correct |
130 ms |
5044 KB |
Output is correct |
| 49 |
Correct |
130 ms |
5452 KB |
Output is correct |
| 50 |
Correct |
130 ms |
5176 KB |
Output is correct |
| 51 |
Correct |
146 ms |
5636 KB |
Output is correct |
| 52 |
Correct |
166 ms |
6248 KB |
Output is correct |
| 53 |
Correct |
152 ms |
5636 KB |
Output is correct |
| 54 |
Correct |
165 ms |
6360 KB |
Output is correct |
| 55 |
Correct |
134 ms |
5396 KB |
Output is correct |
| 56 |
Correct |
140 ms |
5568 KB |
Output is correct |
| 57 |
Correct |
134 ms |
5308 KB |
Output is correct |
| 58 |
Correct |
133 ms |
5052 KB |
Output is correct |
| 59 |
Correct |
146 ms |
4552 KB |
Output is correct |
| 60 |
Correct |
165 ms |
6492 KB |
Output is correct |
| 61 |
Correct |
157 ms |
6020 KB |
Output is correct |
| 62 |
Correct |
133 ms |
5592 KB |
Output is correct |
| 63 |
Correct |
155 ms |
6120 KB |
Output is correct |
| 64 |
Correct |
139 ms |
5436 KB |
Output is correct |
| 65 |
Correct |
139 ms |
5064 KB |
Output is correct |
| 66 |
Correct |
141 ms |
5212 KB |
Output is correct |
| 67 |
Correct |
131 ms |
4984 KB |
Output is correct |
| 68 |
Correct |
193 ms |
6524 KB |
Output is correct |
| 69 |
Correct |
149 ms |
6388 KB |
Output is correct |
