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Use monotonic decreasing stack to track indices, pop when warmer day found.
Example:
Input:
temperatures=[73,74,75,71,69,72,76,73]Output:
[1,1,4,2,1,1,0,0]Common Mistakes:
- Using nested loops O(n²) when stack gives O(n)
- Storing temperatures instead of indices in stack
- Wrong comparison (should be > not >=)
- Not understanding monotonic stack pattern
Notes:
Classic monotonic stack problem. Time O(n), Space O(n). Pattern: finding next greater/smaller element.
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Use monotonic decreasing stack to track indices, pop when warmer day found.
Example:
Input:
temperatures=[73,74,75,71,69,72,76,73]Output:
[1,1,4,2,1,1,0,0]Common Mistakes:
- Using nested loops O(n²) when stack gives O(n)
- Storing temperatures instead of indices in stack
- Wrong comparison (should be > not >=)
- Not understanding monotonic stack pattern
Notes:
Classic monotonic stack problem. Time O(n), Space O(n). Pattern: finding next greater/smaller element.
60/75
Daily Temperatures