How to Fix Daily Temperatures Errors

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

Fix daily temperatures errors when monotonic stack indices miscalculate wait times or O(n^2) times out.

Quick Fix

Wrong

def daily_t(t):
    r=[0]*len(t)
    for i in range(len(t)):
        for j in range(i+1,len(t)):
            if t[j]>t[i]: r[i]=j-i; break
    return r

O(n^2) brute force times out for large arrays.

Right

def daily_t(t):
    r=[0]*len(t); st=[]
    for i,v in enumerate(t):
        while st and v>t[st[-1]]:
            idx=st.pop(); r[idx]=i-idx
        st.append(i)
    return r

[73,74,75,71,69,72,76,73] -> [1,1,4,2,1,1,0,0]. O(n).

Prevention

Decreasing monotonic stack storing indices. Resolve colder days when warmer appears.

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