Golang | Leetcode Golang题解之第321题拼接最大数

题目：

题解：

func maxSubsequence(a []int, k int) (s []int) {for i, v := range a {for len(s) > 0 && len(s)+len(a)-1-i >= k && v > s[len(s)-1] {s = s[:len(s)-1]}if len(s) < k {s = append(s, v)}}return
}func lexicographicalLess(a, b []int) bool {for i := 0; i < len(a) && i < len(b); i++ {if a[i] != b[i] {return a[i] < b[i]}}return len(a) < len(b)
}func merge(a, b []int) []int {merged := make([]int, len(a)+len(b))for i := range merged {if lexicographicalLess(a, b) {merged[i], b = b[0], b[1:]} else {merged[i], a = a[0], a[1:]}}return merged
}func maxNumber(nums1, nums2 []int, k int) (res []int) {start := 0if k > len(nums2) {start = k - len(nums2)}for i := start; i <= k && i <= len(nums1); i++ {s1 := maxSubsequence(nums1, i)s2 := maxSubsequence(nums2, k-i)merged := merge(s1, s2)if lexicographicalLess(res, merged) {res = merged}}return
}