This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
using namespace std;
const long long maxN = 1e5 + 5, inf = 1e9;
long long arr[maxN];
int main(){
long long n, k, t;
cin >> n >> k >> t;
k--;
for (int i = 0; i < n; i++) cin >> arr[i];
long long l = 1, r = inf, ans = inf;
while(l <= r){
long long mid = (l+r)/2, left_margin = inf, right_margin = inf, left_end = 0, right_end = 0;
for (int i = k-1; i >= 0; i--){
long long last = arr[k] - (k-i)*2*mid*t;
if (last < -inf){
left_end = inf;
break;
}
long long diff = arr[i] - last;
left_margin = min(left_margin, diff);
if (i == 0) left_end = diff;
}
for (int i = k+1; i < n; i++){
long long last = arr[k] + (i-k)*2*mid*t;
if (last > 2*inf){
right_end = inf;
break;
}
long long diff = last - arr[i];
right_margin = min(right_margin, diff);
if (i == n-1) right_end = diff;
}
if ((left_margin >= 0 && left_end + right_margin >= 0) || (right_margin >= 0 && right_end + left_margin >= 0)){
ans = mid;
r = mid-1;
}
else l = mid+1;
}
cout << ans << endl;
}
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