package main import "fmt" func main() { var a int nums := map[int]int{} cnt := 0 for i := 1; i <= 4*4; i++ { _, _ = fmt.Scan(&a) nums[a] = i % 16 if a == i%16 { cnt++ } } // fmt.Println(nums) if nums[0] == 0 && cnt != 16 { fmt.Println("No") return } for nums[0] != 0 { c := nums[0] t := nums[nums[0]] if c-1 != t && c+1 != t && c-4 == t && c+4 == t { fmt.Println("No") return } nums[0], nums[nums[0]] = nums[nums[0]], nums[0] // fmt.Println(nums) } fmt.Println("Yes") }