• Codeforces Round #450 (Div. 2) C. Remove Extra One【*模拟链表/一个数比前面所有数大就是个record。删掉一个数,让record的个数尽量多。】


    C. Remove Extra One
    time limit per test
    2 seconds
    memory limit per test
    256 megabytes
    input
    standard input
    output
    standard output

    You are given a permutation p of length n. Remove one element from permutation to make the number of records the maximum possible.

    We remind that in a sequence of numbers a1, a2, ..., ak the element ai is a record if for every integer j (1 ≤ j < i) the following holds:aj < ai.

    Input

    The first line contains the only integer n (1 ≤ n ≤ 105) — the length of the permutation.

    The second line contains n integers p1, p2, ..., pn (1 ≤ pi ≤ n) — the permutation. All the integers are distinct.

    Output

    Print the only integer — the element that should be removed to make the number of records the maximum possible. If there are multiple such elements, print the smallest one.

    Examples
    input
    1
    1
    output
    1
    input
    5
    5 1 2 3 4
    output
    5
    Note

    In the first example the only element can be removed.

     【代码】:

    #include<bits/stdc++.h>
    using namespace std;
    const int N=1e5+5;
    int mx,mx2,n,mn=-1e9,res;
    int a[N];
    int main()
    {
        scanf("%d",&n);
        for(int i=0;i<n;i++)
        {
            int x;
            scanf("%d",&x);
            if(x>mx)
            {
                mx2=mx;
                mx=max(mx,x);
                a[x]--;
            }
            else if(x>mx2)
            {
                a[mx]++;
                mx2=max(mx2,x);
            }
        }
        for(int i=1;i<=n;i++)
        {
            if(a[i]>mn)
            {
                mn=a[i];
                res=i;
            }
        }
        cout<<res<<endl;
        return 0;
    }
    View Code
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  • 原文地址:https://www.cnblogs.com/Roni-i/p/8026518.html
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