Input: temperatures = [73,74,75,71,69,72,76,73]
Output: [1,1,4,2,1,1,0,0]
Explanation: For 73 (index 0), next warmer is 74 (index 1), so 1 day. For 74 (index 1), next warmer is 75 (index 2), so 1 day. For 75 (index 2), next warmer is 76 (index 6), so 4 days (6-2). For 71 (index 3), next warmer is 72 (index 5), so 2 days. For 69 (index 4), next warmer is 72 (index 5), so 1 day. For 72 (index 5), next warmer is 76 (index 6), so 1 day. For 76 (index 6), no warmer day, so 0. For 73 (index 7), no warmer day, so 0.