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OI-codes/Luogu/P7273/P7273.cpp

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2021-08-21 12:49:32 +00:00
#include <bits/stdc++.h>
using namespace std;
int n, w, a[300005], t[300005], ans;
int main() {
cin >> n >> w;
if (n == 1) {
cout << 0 << endl;
exit(0);
}
for (int i = 0; i < n; i++) {
cin >> a[i];
}
ans = n;
for (int d = 0; (n - 1) * d + 1 <= w; d++) {
for (int i = 0; i < n; i++) {
if (a[i] > d * i && a[i] - (i - n + 1) * d <= w) {
ans = min(ans, n - ++t[a[i] - d * i]);
}
}
for (int i = 0; i < n; i++) {
if (a[i] > d * i) {
t[a[i] - d * i] = 0;
}
}
}
cout << ans << endl;
return 0;
}