O(n) time and O(1) space

1732. Find the Highest Altitude/1732. Find the Highest Altitude.py

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+"""
+There is a biker going on a road trip. The road trip consists of n + 1 points at different altitudes. The biker starts his trip on point 0 with altitude equal 0.
+
+You are given an integer array gain of length n where gain[i] is the net gain in altitude between points i​​​​​​ and i + 1 for all (0 <= i < n). Return the highest altitude of a point.
+
+
+
+Example 1:
+
+Input: gain = [-5,1,5,0,-7]
+Output: 1
+Explanation: The altitudes are [0,-5,-4,1,1,-6]. The highest is 1.
+Example 2:
+
+Input: gain = [-4,-3,-2,-1,4,3,2]
+Output: 0
+Explanation: The altitudes are [0,-4,-7,-9,-10,-6,-3,-1]. The highest is 0.
+
+
+Constraints:
+
+n == gain.length
+1 <= n <= 100
+-100 <= gain[i] <= 100
+"""
+class Solution:
+    def largestAltitude(self, gain: List[int]) -> int:
+        result,cur = -sys.maxsize-1,0
+        for num in gain:
+            cur += num
+            result = max(result, cur)
+        return max(result,0)