제출 #886477

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
886477		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;
        // std::cout << "here: " << b[i] << ' ' << a[b[i]] << ' ' << prev[b[i]] << ' ' << endHere[prev[b[i]]] << ' ' << i - (n - ans + endHere[prev[b[i]]])  << '\n';
        if (endHere[prev[b[i]]])
        {
            ans--;
            endHere[prev[b[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;
}

/*
8
7 6 8 1 5 2 4 3
7 | 5 7 | 1 4 | 1 2 | 1

1 | 1 |1 2| 4 | 5 7 | 7

7 5 7 1 4 1 2 1

5
7 | 5 7 | 1 5 2 4 3
*/

컴파일 시 표준 에러 (stderr) 메시지

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