add sol

leetcode/179.LargestNumber/sol.go

@@ -0,0 +1,48 @@
+// https://leetcode.com/problems/largest-number/description/
+
+package main
+
+import (
+	"fmt"
+	"sort"
+	"strconv"
+	"strings"
+)
+
+// Custom comparator function
+func compare(x, y string) bool {
+	return x+y > y+x
+}
+
+func largestNumber(nums []int) string {
+	// Convert numbers to string
+	numsStr := make([]string, len(nums))
+	for i, num := range nums {
+		numsStr[i] = strconv.Itoa(num)
+	}
+	// fmt.Print(numsStr)
+
+	// Sort numbers using custom comparator
+	sort.Slice(numsStr, func(i, j int) bool {
+		return compare(numsStr[i], numsStr[j])
+	})
+
+	// fmt.Print(numsStr)
+
+	// Join the sorted strings
+	result := strings.Join(numsStr, "")
+
+	// Handle edge case where the result is "0" (e.g., when input is [0, 0])
+	if result[0] == '0' {
+		return "0"
+	}
+
+	return result
+}
+
+func main() {
+	// Example usage
+	nums := []int{3, 30, 34, 5, 9}
+	result := largestNumber(nums)
+	fmt.Println("Largest number:", result)
+}