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  • Codeforces Round #305 (Div. 2) D. Mike and Feet

    D. Mike and Feet
    time limit per test
    1 second
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    Mike is the president of country What-The-Fatherland. There are n bears living in this country besides Mike. All of them are standing in a line and they are numbered from 1 to n from left to right. i-th bear is exactly ai feet high.

    A group of bears is a non-empty contiguous segment of the line. The size of a group is the number of bears in that group. The strength of a group is the minimum height of the bear in that group.

    Mike is a curious to know for each x such that 1 ≤ x ≤ n the maximum strength among all groups of size x.

    Input

    The first line of input contains integer n (1 ≤ n ≤ 2 × 105), the number of bears.

    The second line contains n integers separated by space, a1, a2, ..., an (1 ≤ ai ≤ 109), heights of bears.

    Output

    Print n integers in one line. For each x from 1 to n, print the maximum strength among all groups of size x.

    Examples
    input
    10
    1 2 3 4 5 4 3 2 1 6
    output
    6 4 4 3 3 2 2 1 1 1 
    学些数据结构才可以拯救自己吧,数据结构是省时的好东西哦,本来n^2可以变为nlgn甚至n,简直爆炸,单调栈就算能把复杂程度降到n的,太强辣,强行学习一波
    其实我只是为了做出我们平台那道题,大佬讲让我用单调栈类似物,但是我并不了解这种数据结构啊,先mark下
    #include <bits/stdc++.h>
    using namespace std;
    const int N=2e5+5;
    struct node
    {
        int L, num;
    }S;
    stack <node> sta;
    int a[N], ans[N];
    int main ()
    {
        int n;
        while (scanf ("%d", &n) != EOF)
        {
            for (int i=0; i<n; i++)
                scanf ("%d", &a[i]);
    
            for (int i=0; i<=n; i++)
            {
                int l = 0;
    
                while (!sta.empty ())
                {
                    S = sta.top ();
    
                    if (S.num < a[i]) break;
    
                    int lr = S.L + l;
                    ans[lr] = max (ans[lr], S.num);
    
                    l += S.L;
                    sta.pop ();
                }
                sta.push((node){l+1, a[i]});
            }
    
            for (int i=n; i>=1; i--)
                ans[i] = max (ans[i], ans[i+1]);
            for (int i=1; i<n; i++)
                printf ("%d ", ans[i]);
            printf ("%d
    ", ans[n]);
        }
        return 0;
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/BobHuang/p/6826638.html
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