Заменить каждый элемент массива его предыдущим элементом
Опубликовано: 3 Декабря, 2021
Учитывая массив arr , задача состоит в том, чтобы заменить каждый элемент массива на элемент, который появляется перед ним, и заменить первый элемент на -1 .
Примеры:
Input: arr[] = {5, 1, 3, 2, 4}
Output: -1 5 1 3 2
Input: arr[] = {6, 8, 32, 12, 14, 10, 25 }
Output: -1 6 8 32 12 14 10
Рекомендуется: сначала попробуйте свой подход в {IDE}, прежде чем переходить к решению.
Подход: перейдите по массиву от n - 1 до 1 и обновите arr [i] = arr [i-1] . В конце установите [0] = -1 и распечатайте содержимое обновленного массива.
Ниже представлена реализация описанного выше подхода:
C ++
// C++ program to replace every element of the array// with the element that appears before it#include <bits/stdc++.h>using namespace std;// Function to print the array after replacing every element// of the array with the element that appears before itvoid updateArray( int arr[], int n){ // Update array for ( int i = n - 1; i > 0; i--) arr[i] = arr[i - 1]; // Change the first element to -1 arr[0] = -1; // Print the updated array for ( int i = 0; i < n; i++) cout << arr[i] << " " ;}// Driver programint main(){ int arr[] = { 5, 1, 3, 2, 4 }; int N = sizeof (arr) / sizeof (arr[0]); updateArray(arr, N); return 0;} |
Джава
// Java program to replace every element// of the array with the element that// appears before itclass GFG{// Function to print the array after// replacing every element of the// array with the element that appears// before itstatic void updateArray( int arr[], int n){ // Update array for ( int i = n - 1 ; i > 0 ; i--) arr[i] = arr[i - 1 ]; // Change the first element to -1 arr[ 0 ] = - 1 ; // Print the updated array for ( int i = 0 ; i < n; i++) System.out.print(arr[i] + " " );}// Driver Codepublic static void main(String []args){ int arr[] = { 5 , 1 , 3 , 2 , 4 } ; int N = arr.length ; updateArray(arr, N);}}// This code is contributed by Ryuga |
Python3
# Python 3 program to replace every element# of the array with the element that appears# before it# Function to print the array after replacing# every element of the array with the element# that appears before itdef updateArray(arr, n): # Update array i = n - 1 while (i > 0 ): arr[i] = arr[i - 1 ] i - = 1 # Change the first element to -1 arr[ 0 ] = - 1 # Print the updated array for i in range ( 0 , n, 1 ): print (arr[i], end = " " )# Driver Codeif __name__ = = '__main__' : arr = [ 5 , 1 , 3 , 2 , 4 ] N = len (arr) updateArray(arr, N)# This code is contributed by# Surendra_Gangwar |
C #
// C# program to replace every element// of the array with the element that// appears before itusing System;class GFG{// Function to print the array after// replacing every element of the// array with the element that appears// before itstatic void updateArray( int [] arr, int n){ // Update array for ( int i = n - 1; i > 0; i--) arr[i] = arr[i - 1]; // Change the first element to -1 arr[0] = -1; // Print the updated array for ( int i = 0; i < n; i++) Console.Write(arr[i] + " " );}// Driver Codepublic static void Main(){ int [] arr = { 5, 1, 3, 2, 4 } ; int N = arr.Length ; updateArray(arr, N);}}// This code is contributed// by Akanksha Rai |
PHP
<?php// PHP program to replace every element// of the array with the element that// appears before it// Function to print the array after// replacing every element of the array// with the element that appears before itfunction updateArray( $arr , $n ){ // Update array for ( $i = $n - 1; $i > 0; $i --) $arr [ $i ] = $arr [ $i - 1]; // Change the first element to -1 $arr [0] = -1; // Print the updated array for ( $i = 0; $i < $n ; $i ++) echo $arr [ $i ] , " " ;}// Driver Code$arr = array (5, 1, 3, 2, 4 );$N = sizeof( $arr );updateArray( $arr , $N );// This code is contributed// by Sach_Code?> |
Javascript
<script>// Java script program to replace every element// of the array with the element that// appears before it// Function to print the array after// replacing every element of the// array with the element that appears// before itfunction updateArray(arr,n){ // Update array for (let i = n - 1; i > 0; i--) arr[i] = arr[i - 1]; // Change the first element to -1 arr[0] = -1; // Print the updated array for (let i = 0; i < n; i++) document.write(arr[i] + " " );}// Driver Code let arr =[ 5, 1, 3, 2, 4 ]; let N = arr.length ; updateArray(arr, N);// This code is contributed by sravan kumar G</script> |
Выход:
-1 5 1 3 2