Submission #1282865

#	Time	Username	Problem	Language	Result	Execution time	Memory
1282865		tranbahien0	Rabbit Carrot (LMIO19_triusis)	C++20	0 / 100	2 ms	580 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;

int n, m, k, a[maxn], dp[maxn], t[maxn << 1][2];

vector<int> vals;

void update(int x, int v, bool o) {
    if(o) for(; x <= m; x += x & -x) t[x][o] = max(t[x][o], v);
    else for(; x; x -= x & -x) t[x][o] = max(t[x][o], v);
}

int get(int x, bool o) {
    int res = 0;
    if(!o) for(; x; x -= x & -x) res = max(res, t[x][o]);
    else for(; x <= m; x += x & -x) res = max(res, t[x][o]);
    return res;
}

void compress() {
    FOR(i, 1, n) vals.push_back(a[i]), vals.push_back(a[i] - k);
    sort(vals.begin(), vals.end());
    vals.resize(unique(vals.begin(), vals.end()) - vals.begin());
    m = vals.size();
}

/**
    0: increase
    1: decrease
**/

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) {
        int x = lower_bound(vals.begin(), vals.end(), a[i]) - vals.begin() + 1;
        int y = upper_bound(vals.begin(), vals.begin(), a[i] - k) - vals.begin() + 1;
        if(max(get(x, 1), get(y, 0)) == 0) dp[i] = (a[i] <= k);
        else dp[i] = max(get(x, 1), get(y, 0)) + 1;
        update(x, dp[i], 0);
        update(x, dp[i], 1);
    }
    cout << n - dp[n];
    return 0;
}

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