#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;
ll n, k, t, X[MAXN];
bool make(vector<ll> x, vector<ll> 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 <ll> x, y;
for (int i = k; i >= 0; i--)
x.push_back(X[i] - 1LL * 2 * s * t * i);
for (int i = k; i < n; i++)
y.push_back(X[i] - 1LL * 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 (int i = 0; i < n; i++)
cin >> X[i];
int L = 0, R = infint;
while(R - L > 1)
{
int mid = (L + R) >> 1;
if(check(mid))
R = mid;
else
L = mid;
}
cout << R;
}
Compilation message
sparklers.cpp: In function 'bool make(std::vector<long long int>, std::vector<long long int>)':
sparklers.cpp:21:25: 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:27:25: 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:34:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
return L.first + 1 == x.size() && R.first + 1 == y.size();
~~~~~~~~~~~~^~~~~~~~~~~
sparklers.cpp:34:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
return L.first + 1 == x.size() && R.first + 1 == y.size();
~~~~~~~~~~~~^~~~~~~~~~~
| # |
결과 |
실행 시간 |
메모리 |
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 |
2 ms |
384 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 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 20 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
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 |
2 ms |
384 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 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 20 |
Halted |
0 ms |
0 KB |
- |
| # |
결과 |
실행 시간 |
메모리 |
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 |
2 ms |
384 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 |
Incorrect |
2 ms |
384 KB |
Output isn't correct |
| 20 |
Halted |
0 ms |
0 KB |
- |
