Codeforces Round #656 (Div. 3) 1385C - Make It Good Solution

Problem Link :  https://codeforces.com/problemset/problem/1385/C 

Solution in C++:

///La ilaha illellahu muhammadur rasulullah

///******Bismillahir-Rahmanir-Rahim******///

///Abul Hasnat  Tonmoy

///Department of CSE,23rd batch

///Islamic University,Bangladesh

#include <bits/stdc++.h>

using namespace std;

int main()

{

    long long n,t,i,r,a;

    cin>>t;

    while(t--)

    {

        cin>>n;

        long long a[n+3],ans=1;

        for(i=1; i<=n; i++)

            cin>>a[i];

        if(is_sorted(a+1,a+n+1))

            cout<<"0"<<endl;

        else

        {

            for(i=n-1; i>=1; i--)

            {

                if(a[i]>=a[i+1])

                    ans++;

                else

                    break;

            }

            for(; i>=1; i--)

            {

                if(a[i]<=a[i+1])

                    ans++;

                else

                    break;

            }

            cout<<n-ans<<endl;

        }

    }

}