How to Fix Circular Queue Errors

In this tutorial, you'll learn about How to Fix Circular Queue Errors. We cover key concepts, practical examples, and best practices.

Fix circular queue errors when pointer arithmetic fails or overflow detection in ring buffers is incorrect.

Quick Fix

Wrong

class CQ:
    def __init__(self,k):
        self.q=[0]*k; self.h=0; self.t=0; self.s=0
    def enq(self,v):
        if self.s==len(self.q): return False
        self.q[self.t%len(self.q)]=v; self.t+=1; self.s+=1

tail grows unbounded without modulo.

Right

class CQ:
    def __init__(self,k):
        self.q=[0]*k; self.h=0; self.t=0; self.s=0
    def enq(self,v):
        if self.s==len(self.q): return False
        self.q[self.t]=v; self.t=(self.t+1)%len(self.q); self.s+=1; return True
    def deq(self):
        if self.s==0: return False
        self.h=(self.h+1)%len(self.q); self.s-=1; return True

enq(1),enq(2),deq(),enq(3) -> cycles correctly. All O(1).

Prevention

Apply modulo on head and tail. Track size separately for full/empty detection.

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