Submission #958704

#	Time	Username	Problem	Language	Result	Execution time	Memory
958704		Bodisha	Rabbit Carrot (LMIO19_triusis)	C++17	100 / 100	84 ms	4808 KiB

triusis

#include <bits/stdc++.h>
#define MAX_N 200005

using namespace std;

int n, m;
int poles[MAX_N];
vector<int> b;
int dp[MAX_N];

int lnds() {
    for(int i = 0; i < n; i++) {
        int x = (i + 1) * m - poles[i];
        if(x >= 0) {
            b.push_back(x);
        }
    }
    // longest non-decreasing subsequence
    // dp[i] - smallest element for which the subsequence of length i ends
    for(int i = 1; i <= n; i++) {
        dp[i] = INT_MAX;
    }
    dp[0] = INT_MIN;
    for(auto iterb : b) {
        int l = 1, r = n;
        int ans = 1;
        while(l <= r) {
            int mid = l + (r - l) / 2;
            if(dp[mid] > iterb) {
                ans = mid;
                r = mid - 1;
            } else {
                l = mid + 1;
            }
        }
        dp[ans] = iterb;
    }
    for(int i = 1; i <= n; i++) {
        if(dp[i] == INT_MAX) {
            return i - 1;
        }
    }
    return n;
}

int main() {
    cin >> n >> m;
    for(int i = 0; i < n; i++) {
        cin >> poles[i];
    }
    cout << n - lnds();
    return 0;
}

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