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 <bits/stdc++.h>
using namespace std;
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int n, t;
cin >> n >> t;
vector<int> a(n);
for (int i = 0; i < n; i++) {
cin >> a[i];
a[i] %= t;
}
sort(a.begin(), a.end());
int res = a[n - 1] - a[0];
for (int i = 0; i + 1 < n; i++) {
res = min(res, a[i] - (a[i + 1] - t));
}
cout << (res + 1) / 2 << '\n';
return 0;
}
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