Submission #886473

#	Time	Username	Problem	Language	Result	Execution time	Memory
886473		boris_mihov	Money (IZhO17_money)	C++17	0 / 100	1 ms	6492 KiB

money

#include <algorithm>
#include <iostream>
#include <numeric>
#include <cassert>
#include <bitset>
#include <vector>
#include <stack>

typedef long long llong;
const int MAXN = 1000000 + 10;

int n;
int a[MAXN];
int b[MAXN];
int prev[MAXN];
bool endHere[MAXN];
std::stack <int> st;

void solve()
{
    std::iota(b + 1, b + 1 + n, 1);
    std::sort(b + 1, b + 1 + n, [&](int x, int y)
    {
        return a[x] < a[y] || (a[x] == a[y] & x < y);
    });

    for (int i = 1 ; i <= n ; ++i)
    {
        a[b[i]] = i;
    }

    for (int i = 1 ; i <= n ; ++i)
    {
        while (st.size() && a[st.top()] > a[i])
        {
            st.pop();
        }

        if (st.size())
        {
            prev[i] = st.top();
        }

        st.push(i);
    }

    int ans = n;
    for (int i = 1 ; i <= n ; ++i)
    {
        endHere[b[i]] = true;
        if (endHere[prev[i]])
        {
            ans--;
            endHere[prev[i]] = false;
        }
    }

    std::cout << ans << '\n';
}

void input()
{
    std::cin >> n;
    for (int i = 1 ; i <= n ; ++i)
    {
        std::cin >> a[i];
    }
}

void fastIOI()
{
    std::ios_base :: sync_with_stdio(0);
    std::cout.tie(nullptr);
    std::cin.tie(nullptr);
}

int main()
{
    fastIOI();
    input();
    solve();

    return 0;
}

Compilation message (stderr)

money.cpp: In lambda function:
money.cpp:24:37: warning: suggest parentheses around comparison in operand of '&' [-Wparentheses]
   24 |         return a[x] < a[y] || (a[x] == a[y] & x < y);
      |                                ~~~~~^~~~~~~

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