Help me in solving SESO12 problem

help
,
1

My issue

please find the error in the program

My code

#include <bits/stdc++.h>
using namespace std;

int main() {
    int n;
    cin>>n;
    int arr[i];
    for(int i=0;i<n;i++)
    { 
        cin>>arr[i];
    }
       for(int i=0;i<n;i++){
        int j = i;
        while (j>=1)
        if(arr[j]>=arr[j-1]) break;
        else{
            swap(arr[j],arr[j-1]);
            j--;
        }
       }

         for(int i=0;i<n;i++){
             cout<<arr[i]<<" ";
         }
}

Learning course: Design and analysis of Algorithms
Problem Link: https://www.codechef.com/learn/course/abesit-daa/ABESITDA17/problems/SESO12