Find the Highest Altitude — Day 102(Python)
We will work on another Easy tagged question from leetcode today.
1732. Find the Highest Altitude
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 an altitude equal to
You are given an integer array
gain of length
gain[i] is the net gain in altitude between points
i + 1 for all (
0 <= i < n). Return the highest altitude of a point.
Input: gain = [-5,1,5,0,-7]
Explanation: The altitudes are [0,-5,-4,1,1,-6]. The highest is 1.
Input: gain = [-4,-3,-2,-1,4,3,2]
Explanation: The altitudes are [0,-4,-7,-9,-10,-6,-3,-1]. The highest is 0.
n == gain.length
1 <= n <= 100
-100 <= gain[i] <= 100
The given input array gives us the net gain in altitude. Since we need to identify the highest altitude, we need to find the altitude at the current position using the input net gain array.
Let us look into the solution.
def largestAltitude(self, gain: List[int]) -> int:
output = 0
curr_alt = 0
for n in gain:
curr_alt += n
output = max(curr_alt, output)
Since we are just traversing through the array once, the time complexity is O(N).
We are not using any extra space, and hence the space complexity will be O(1).