Key cutting

#include<bits/stdc++.h>
using namespace std;
using ll = long long;

int main() {
    
    int n;
    cin >> n;

    stack<int> st;
    st.push(0);
    int ans = 0;

    for (int i = 1; i <= n; i++) {

        int x;
        cin >> x;

        while (!st.empty() && st.top() > x) st.pop();

        if (st.empty() || st.top() < x) {
            ans++;
            st.push(x);
        }

    }

    cout << ans;

}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED