//#pragma GCC optimize("O3")
//#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
using namespace __gnu_pbds;
template <class T>
using Tree =
tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define int long long
#define ll long long
#define pii pair<int, int>
#define pll pair<ll, ll>
#define fi first
#define se second
#define rep(i, a, b) for (int i = a; i <= b; ++i)
#define per(i, b, a) for (int i = b; i >= a; --i)
#define pb push_back
#define eb emplace_back
#define all(v) (v).begin(), (v).end()
#define lsb(x) (x)&(-x)
void setIO(string name = "") {
ios_base::sync_with_stdio(false);
cin.tie(nullptr);cout.tie(nullptr);
if (!name.empty()) {
freopen((name + ".in").c_str(), "r", stdin);
freopen((name + ".out").c_str(), "w", stdout);
}
}
ll fexp(ll a, ll b, ll m) {
if (b == 0) return 1LL;
ll p = a;
ll ans = 1;
while (b > 0) {
if (b % 2 != 0) ans = (ans*p)%m;
p = (p*p)%m;
b >>= 1;
}
return ans;
}
const int MAXN = 2e5 + 10;
const int INF = 1e18+5;
const int MOD = 1e9+7;
int a[MAXN], dp[MAXN];
void solve() {
int n,m;cin >> n >> m;
rep(i,1,n) cin >> a[i];
rep(i,1,n) a[i] = m*i-a[i];
dp[0] = -INF;
rep(i,1,n) dp[i] = INF;
int ans = 0;
rep(i,1,n) {
if (a[i] < 0) continue;
int p = upper_bound(dp, dp+n+1, a[i]) - dp;
dp[p] = a[i];
ans = max(p,ans);
}
cout << n-ans << '\n';
}
int32_t main() {
setIO();
int tt = 1;
//cin >> tt;
while (tt-- > 0) solve();
}
Compilation message (stderr)
triusis.cpp: In function 'void setIO(std::string)':
triusis.cpp:28:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
28 | freopen((name + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
triusis.cpp:29:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
29 | freopen((name + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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