Left Rotation

Problem Statement :

A left rotation operation on an array of size n shifts each of the array's elements 1 unit to the left. Given an integer, d, rotate the array that many steps left and return the result.


After 2 rotations, arr'=[3,4,5,1,2].

Function Description:

Complete the rotateLeft function in the editor below.

rotateLeft has the following parameters:
   1. int d: the amount to rotate by
   2. int arr[n]: the array to rotate

   1. int[n]: the rotated array

Input Format:

The first line contains two space-separated integers that denote n, the number of integers, and d, the number of left rotations to perform.
The second line contains n space-separated integers that describe arr[].

   1. 1<=n<=10^5 
   2. 1<=d<=n 
   3. 1<=a[i]<=10^6

Solution :


                            Solution in C :

In C:

#include <stdio.h>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main() {

    int N;
    int d;
    scanf("%d %d", &N, &d);  
    int A[N];
    for (int i = 0; i < N; i++)
        scanf("%d", &A[i]);    
    for (int i = 0; i < N; i++)
        printf("%d ", A[(i + d) % N]);    
    return 0;

In C++:

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    int N, d, i;
    cin >> N >> d;
    int start = N - d;
    int *arr = new int[N];
    for (i=0; i<N; ++i) {
        if (start == N) start = 0;
        cin >> arr[start++];
    for (i=0; i<N; ++i) cout << arr[i] << " ";
    return 0;

In Java:

import java.io.*;
import java.util.*;

public class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int N = scan.nextInt();
        int n = scan.nextInt();
        int[] A = new int[N];
        for (int i=0; i<N; ++i) {
            A[i] = scan.nextInt();
        for (int i=0; i<n; ++i) {
        for (int a : A) {
            System.out.print(a+" ");
    private static void rotateArray(int[] A) {
        int t = A[0];
        for (int i=0; i<A.length-1; ++i) {
            A[i] = A[i+1];
        A[A.length-1] = t;

In Python 3:

n, d = map(int, input().split())
arr = [int(x) for x in input().split()]

for i in range(d):
for x in arr[d:]:
    print(x, end=' ')

View More Similar Problems

Queries with Fixed Length

Consider an -integer sequence, . We perform a query on by using an integer, , to calculate the result of the following expression: In other words, if we let , then you need to calculate . Given and queries, return a list of answers to each query. Example The first query uses all of the subarrays of length : . The maxima of the subarrays are . The minimum of these is . The secon

View Solution →


This question is designed to help you get a better understanding of basic heap operations. You will be given queries of types: " 1 v " - Add an element to the heap. " 2 v " - Delete the element from the heap. "3" - Print the minimum of all the elements in the heap. NOTE: It is guaranteed that the element to be deleted will be there in the heap. Also, at any instant, only distinct element

View Solution →

Jesse and Cookies

Jesse loves cookies. He wants the sweetness of all his cookies to be greater than value K. To do this, Jesse repeatedly mixes two cookies with the least sweetness. He creates a special combined cookie with: sweetness Least sweet cookie 2nd least sweet cookie). He repeats this procedure until all the cookies in his collection have a sweetness > = K. You are given Jesse's cookies. Print t

View Solution →

Find the Running Median

The median of a set of integers is the midpoint value of the data set for which an equal number of integers are less than and greater than the value. To find the median, you must first sort your set of integers in non-decreasing order, then: If your set contains an odd number of elements, the median is the middle element of the sorted sample. In the sorted set { 1, 2, 3 } , 2 is the median.

View Solution →

Minimum Average Waiting Time

Tieu owns a pizza restaurant and he manages it in his own way. While in a normal restaurant, a customer is served by following the first-come, first-served rule, Tieu simply minimizes the average waiting time of his customers. So he gets to decide who is served first, regardless of how sooner or later a person comes. Different kinds of pizzas take different amounts of time to cook. Also, once h

View Solution →

Merging Communities

People connect with each other in a social network. A connection between Person I and Person J is represented as . When two persons belonging to different communities connect, the net effect is the merger of both communities which I and J belongs to. At the beginning, there are N people representing N communities. Suppose person 1 and 2 connected and later 2 and 3 connected, then ,1 , 2 and 3 w

View Solution →