#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 (L < R)
{
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();
~~~~~~~~~~~~^~~~~~~~~~~
sparklers.cpp: In function 'int main()':
sparklers.cpp:64:9: error: 'r' was not declared in this scope
r = mid;
^
sparklers.cpp:66:7: error: 'l' was not declared in this scope
l = mid;
^
sparklers.cpp:68:12: error: 'r' was not declared in this scope
cout << r;
^
