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Create Reverse n elements of a given queue.c #409

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40 changes: 40 additions & 0 deletions C/Reverse n elements of a given queue.c
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Original file line number Diff line number Diff line change
@@ -0,0 +1,40 @@
/*
int front=-1, rear=-1;
int array[SIZE];
void enqueue(int item);
int dequeue();

Above variables are used for queue, SIZE, front and rear and all are global variables. Complete the below two methods. */
#include<stdlib.h>
static int check=1,l=1;
void reverseQueue(int q[])
{
if(front<rear)
{
int x=dequeue();
l++;
reverseQueue(q);
enqueue(x);
}
}
void reverseKelementsQueue (int q[],int k)
{
if(k==0)
{
check=1;
l=1;
return;
}
if(check==1)
{
check=0;
reverseQueue(q);
k=l-k;
}
if(front<rear&&check==0)
{
int x=dequeue();
reverseKelementsQueue(q,k-1);
enqueue(x);
}
}