package main import ( "fmt" ) func main() { nums := []int{2,1,1,2,3,5,1,2,4} fmt.Println(firstRecurringChar(nums)) } func firstRecurringChar(nums []int) int { tMap := map[int]bool{} for _, num := range nums { if _, ok := tMap[num]; ok { return num } tMap[num] = true } return -1 }