g0701_0800.s0747_largest_number_at_least_twice_of_others

Class Solution

java.lang.Object

g0701_0800.s0747_largest_number_at_least_twice_of_others.Solution

public class Solution
extends Object

747 - Largest Number At Least Twice of Others.

Easy

You are given an integer array nums where the largest integer is unique.

Determine whether the largest element in the array is at least twice as much as every other number in the array. If it is, return the index of the largest element, or return -1 otherwise.

Example 1:

Input: nums = [3,6,1,0]

Output: 1

Explanation: 6 is the largest integer. For every other number in the array x, 6 is at least twice as big as x. The index of value 6 is 1, so we return 1.

Example 2:

Input: nums = [1,2,3,4]

Output: -1

Explanation: 4 is less than twice the value of 3, so we return -1.

Example 3:

Input: nums = [1]

Output: 0

Explanation: 1 is trivially at least twice the value as any other number because there are no other numbers.

Constraints:

• 1 <= nums.length <= 50
• 0 <= nums[i] <= 100
• The largest element in nums is unique.

Constructor Summary

Constructors

Constructor and Description
Solution()

Method Summary

Modifier and Type	Method and Description
int	dominantIndex(int[] arr)
int	findNum(int target, int[] arr)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Solution

public Solution()

Method Detail

dominantIndex

public int dominantIndex(int[] arr)

findNum

public int findNum(int target,
                   int[] arr)