<p>Given an array of integers <code>temperatures</code> represents the daily temperatures, return <em>an array</em> <code>answer</code> <em>such that</em> <code>answer[i]</code> <em>is the number of days you have to wait after the</em> <code>i<sup>th</sup></code> <em>day to get a warmer temperature</em>. If there is no future day for which this is possible, keep <code>answer[i] == 0</code> instead.</p>

<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> temperatures = [73,74,75,71,69,72,76,73]
<strong>Output:</strong> [1,1,4,2,1,1,0,0]
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> temperatures = [30,40,50,60]
<strong>Output:</strong> [1,1,1,0]
</pre><p><strong class="example">Example 3:</strong></p>
<pre><strong>Input:</strong> temperatures = [30,60,90]
<strong>Output:</strong> [1,1,0]
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>

<ul>
	<li><code>1 &lt;=&nbsp;temperatures.length &lt;= 10<sup>5</sup></code></li>
	<li><code>30 &lt;=&nbsp;temperatures[i] &lt;= 100</code></li>
</ul>

class Solution:
    def dailyTemperatures(self, temperatures: list[int]) -> list[int]:
        # Result array initialized with 0s, default value for days with no warmer future temperatures
        answer = [0] * len(temperatures)
        # Stack to store indices of temperatures in decreasing order
        stack = []

        # Iterate through each day in the temperatures list
        for i, temp in enumerate(temperatures):
            # Check the stack for indices of previous days with lower temperatures
            while stack and temperatures[stack[-1]] < temp:
                # Pop the index of the colder temperature day
                prev_day_index = stack.pop()
                # Calculate the number of days until the current warmer day
                answer[prev_day_index] = i - prev_day_index
            # Push the current day index to the stack
            stack.append(i)

        return answer

# Example usage:
if __name__ == "__main__":
    solution = Solution()
    
    # Example 1
    temperatures = [73, 74, 75, 71, 69, 72, 76, 73]
    print(solution.dailyTemperatures(temperatures))  # Output: [1, 1, 4, 2, 1, 1, 0, 0]



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