Submission #854067

#	Time	Username	Problem	Language	Result	Execution time	Memory
854067		The_Samurai	Money (IZhO17_money)	C++17	0 / 100	1 ms	348 KiB

money

#include "bits/stdc++.h"
using namespace std;
using ll = long long;
const int inf = 1e9;

int main() {
    cin.tie(0)->sync_with_stdio(false);
#ifdef sunnatov
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif

    int n;
    cin >> n;
    vector<int> a(n + 1);
    for (int i = 1; i <= n; i++) cin >> a[i];
    vector<bool> incr(n + 1); incr[0] = true;
    for (int i = 1; i <= n; i++) incr[i] = incr[i - 1] & (a[i] > a[i - 1]);
    if (incr[n]) {
        cout << 1;
        return 0;
    }
    set<int> st;
    for (int i = 1; i <= n; i++) st.insert(a[i]);
    int cnt = 1;
    for (int i = n; i > 0; i--) {
        if (incr[i - 1]) {
            cout << cnt + 1;
            return 0;
        }
        if (a[i - 1] == a[i]) continue;
        if (st.upper_bound(a[i - 1]) == st.end() or *st.upper_bound(a[i - 1]) != a[i]) {
            cnt++;
        }
    }
}

• Subtask 1: 0 / 9
• Subtask 2: 0 / 16
• Subtask 3: 0 / 20
• Subtask 4: 0 / 55