package main import ( "fmt" "sort" ) var MOD_VAL uint64 = 1000000000 + 7 //func fact(n int) int { // if n <= 1 { // return n // } // return n * fact(n-1) % MOD_VAL //} func countBits(v int) (n int) { for v > 0 { n += v & 1 v >>= 1 } return } var N, K int var as, nBits []int func main() { fmt.Scan(&N, &K) as = make([]int, K) nBits = make([]int, K) for i := 0; i < K; i++ { fmt.Scan(&as[i]) nBits[i] = countBits(as[i]) } fmt.Println(solve()) } func solve() uint64 { sort.Ints(as) for i := 0; i < K-1; i++ { if as[i]|as[i+1] != as[i+1] { return 0 } } sort.Ints(nBits) if len(nBits) == 0 || len(nBits) > 0 && nBits[len(nBits)-1] < N { nBits = append(nBits, N) } // fmt.Printf("N = %d, K = %d\n", N, K) // fmt.Println(as) // fmt.Println(nBits) preVal := 0 var ret uint64 = 1 for _, v := range nBits { gap := v - preVal // if gap == 0 { // ret = 0 // break // } // ret *= fact(gap) for i := 2; i <= gap; i++ { ret *= uint64(i) ret %= MOD_VAL } preVal = v } return ret }