Package 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 java.lang.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
    Description
    Solution()
     

  • Method Summary

    Modifier and Type
    Method
    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 Details

    • Solution

      public Solution()

  • Method Details

    • dominantIndex

      public int dominantIndex(int[] arr)

    • findNum

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