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  1. Practice
  2. Algorithms
  3. Implementation
  4. Circular Array Rotation
  5. Discussions

Circular Array Rotation

  • wildmud + 3 comments
    #include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int n,k,q,i,s=0,e=0, t=0,b;
    cin>>n>>k>>q;
    int a[n];
    for(i=0;i<n;i++)
    {
        cin>>a[i];
        
    }
    
    k=k%n;
    
    s=0,e=n-k-1;
    while(s<e)
    {
       t=a[s];
        a[s]=a[e];
        a[e]=t;
        s++;e--;
        
    }
  
     s=n-k,e=n-1;
    while(s<e)
    {
       t=a[s];
        a[s]=a[e];
        a[e]=t;
        s++;e--;
        
    }
    
     s=0,e=n-1;
    while(s<e)
    {
       t=a[s];
        a[s]=a[e];
        a[e]=t;
        s++;e--;
        
    }
    
     for(i=0;i<q;i++)
    {
        cin>>b;
         cout<<a[b]<<endl;
        
    }
    
    
    
    
    return 0;
}
    • rvrishav7 + 1 comment
      faster than urs i guess.. happy coding
#include<bits/stdc++.h>

using namespace std;


int main() {
   long long int k,n,q;
    cin>>n>>k>>q;
    k=k%n;
   long long int i,ar[n],x,s=0;
    for(i=0;i<n;i++)
        cin>>ar[i];
    for(i=1;i<=q;i++)
    {
          cin>>x;
     s=n-k+x;
     if(s<n)
         cout<<ar[s]<<endl;
     else if(s>=n)
     { s=s-n;
         cout<<ar[s]<<endl;
    }}

    return 0;
}
      • vivekvar_19 + 0 comments

        how do u thought about that...??

    • aiswarya110498 + 0 comments

      Thank you very much..passed all test cases.

    • firozbhaikardar1 + 0 comments

      int* circularArrayRotation(int a_count, int* a, int k, int queries_count, int* queries, int* result_count) { void reverse(int a[],int,int); int i,j,count,x=0; static int s[100]; reverse(a,x,a_count-k-1); reverse(a,a_count-k,a_count-1); reverse(a,x,a_count-1);

      for(i=0;i