Submission #37369

#	Time	Username	Problem	Language	Result	Execution time	Memory
37369		HardNut	Money (IZhO17_money)	C++14	45 / 100	1500 ms	52944 KiB

money

#include <bits/stdc++.h>

using namespace std;

const int N = 1e6 + 5;

typedef long long ll;

int n, a[N], ans, lst;
set<pair<int, int>> st;
bool us;

int main() {
//    freopen("money.in", "r", stdin);
//    freopen("money.out", "w", stdout);
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    for (int i = 1; i <= n; i++) {
        cin >> a[i];
    }
    for (int i = 1; i <= n; i++) {
        st.insert({a[i], i});
        if (lst == a[i]) {
            if (us)
                st.erase({a[i], i});
            continue;
        }
        us = 0;
        lst = a[i];
        auto id = st.find({a[i], i});
        if (id == st.begin()) {
            ans++;
            continue;
        }
        id--;
        if ((*id).second == i - 1) {
            continue;
        }
        id = st.lower_bound({a[i], -1});
        if (id == st.begin()) {
            ans++;
            continue;
        }
        id--;
        if ((*id).second == i - 1) {
            us = 1;
            st.erase({a[i], i});
            continue;
        }
        ans++;
    }
    cout << ans;
}
/**
6
1 5 2 5 5 6
**/

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