Reverse Array

Easy

Python

def reverse_array(arr):
    return arr[::-1]

Java

public int[] reverseArray(int[] arr){
    int l=0,r=arr.length-1;
    while(l<r){
        int t=arr[l];arr[l]=arr[r];arr[r]=t;
        l++;r--;
    } return arr;
}

Key Insight

Python [::-1] creates new reversed array. Java in-place two-pointer.

Python → Java Differences

Python [::-1] one-liner
Java two-pointer in-place
Slicing creates new array

Python

def reverse_array(arr):
    return arr[::-1]

Java

public int[] reverseArray(int[] arr){
    int l=0,r=arr.length-1;
    while(l<r){
        int t=arr[l];arr[l]=arr[r];arr[r]=t;
        l++;r--;
    } return arr;
}

Algorithm Steps

1. Reverse elements

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