Submission #1282907

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282907		tranbahien0	Rabbit Carrot (LMIO19_triusis)	C++20	0 / 100	2 ms	576 KiB

triusis

#include <bits/stdc++.h>
#define FOR(i, a, b) for(int i = (a); i <= (b); i++)
#define FOD(i, a, b) for(int i = (a); i >= (b); i--)
#define file(name) if(fopen(name".inp", "r")) { freopen(name".inp", "r", stdin); freopen(name".out", "w", stdout); }
#define el cout << '\n'
#define maxn int(2e5 + 5)

using namespace std;

typedef long long ll;

int n, k, a[maxn], id[maxn], t[maxn];

vector<ll> vals;

void update(int x, int v) {
    for(; x; x -= x & -x) t[x] = max(t[x], v);
}

int get(int x) {
    int res = 0;
    for(; x <= n; x += x & -x) res = max(res, t[x]);
    return res;
}

void compress() {
    FOR(i, 1, n) if(a[i] - 1LL * k * i < 0) vals.push_back(a[i] - 1LL * k * i);
    sort(vals.begin(), vals.end());
    vals.resize(unique(vals.begin(), vals.end()) - vals.begin());
    FOR(i, 1, n) if(a[i] - 1LL * k * i < 0) id[i] = lower_bound(vals.begin(), vals.end(), a[i] - 1LL * k * i) - vals.begin() + 1;
}

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> k;
    FOR(i, 1, n) cin >> a[i];
    compress();
    FOR(i, 1, n) if(a[i] - 1LL * k * i < 0) {
        int x = get(id[i]);
        if(x == 0) x = (a[i] <= k);
        else x++;
        update(id[i], x);
    }
    cout << n - get(1);
    return 0;
}

• Subtask 1: 0 / 14
• Subtask 2: 0 / 21
• Subtask 3: 0 / 28
• Subtask 4: 0 / 37