[LeetCode 179] Largest Number

Published May 17, 2022 [ String ]

Problem

Given a list of non-negative integers nums, arrange them such that they form the largest number and return it.

Since the result may be very large, so you need to return a string instead of an integer.

Example 1:

Input: nums = [10,2]
Output: "210"

Example 2:

Input: nums = [3,30,34,5,9]
Output: "9534330"

Constraints:

1 <= nums.length <= 100
0 <= nums[i] <= 10^9

Thoughts

We need make sure largest digits occupy most significant digits.

TypeScript

function largestNumber(nums: number[]): string {
    let result: string;
    nums.sort((a, b) => {
        let ba: number = parseInt(b.toString() + a.toString());
        let ab: number = parseInt(a.toString() + b.toString());
        return ba - ab;
    });
    result = nums.join('');
    if (result[0] === '0')
        result = '0';
    return result;
};

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