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LeetCode – Easy – 1732. Find the Highest Altitude

互联网 diligentman 2周前 (04-08) 8次浏览

Topic

  • Array

Description

https://leetcode.com/problems/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 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

Analysis

Submission

public class FindTheHighestAltitude {
	public int largestAltitude(int[] gain) {
		int max = 0, sum = 0;
		for (int num : gain) {
			sum += num;
			if (sum > max)
				max = sum;
		}
		return max;
	}
}

Test

import static org.junit.Assert.*;
import org.junit.Test;

public class FindTheHighestAltitudeTest {

	@Test
	public void test() {
		FindTheHighestAltitude obj = new FindTheHighestAltitude();

		assertEquals(1, obj.largestAltitude(new int[] {-5, 1, 5, 0, -7}));
		assertEquals(0, obj.largestAltitude(new int[] {-4, -3, -2, -1, 4, 3, 2}));
	}
}

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