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Algorithms & data structures medium

How to solve the stock span problem in Python

Calculate the stock span for each day's price using a monotonic stack in O(n) time.

stack monotonic-stack algorithm
Python 
def stock_span(prices):
    span = [1] * len(prices)
    stack = []
    
    for i in range(len(prices)):
        while stack and prices[stack[-1]] <= prices[i]:
            stack.pop()
        span[i] = i - stack[-1] if stack else i + 1
        stack.append(i)
    
    return span

if __name__ == "__main__":
    pric…
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