How to Fix Min Stack Errors

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

Fix min stack errors when minimum isn't updated after pop or duplicate minimums cause incorrect tracking.

Quick Fix

Wrong

class MinStack:
    def __init__(self):
        self.s=[]; self.m=float('inf')
    def push(self,x): self.s.append(x)
        if x<self.m: self.m=x
    def pop(self): self.s.pop()
    def get_min(self): return self.m

Popping minimum doesn't update self.m.

Right

class MinStack:
    def __init__(self):
        self.s=[]; self.ms=[]
    def push(self,x):
        self.s.append(x)
        if not self.ms or x<=self.ms[-1]: self.ms.append(x)
    def pop(self):
        if self.s.pop()==self.ms[-1]: self.ms.pop()
    def get_min(self): return self.ms[-1]

push(3),push(1),push(2),get_min()->1,pop(),get_min()->1. All O(1).

Prevention

Maintain min stack tracking current minimum at each state.

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