24: pandigital products

32_pandigital_products/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"sort"
+	"strconv"
+)
+
+func main() {
+	sum := 0
+	for i := 0; i < 10000; i++ {
+		if hasPandigitalProduct(i) {
+			sum += i
+		}
+	}
+	fmt.Println("sum:", sum)
+}
+
+func hasPandigitalProduct(n int) bool {
+	for i := 1; i <= n; i++ {
+		for n%i == 0 && isPandigital(strconv.Itoa(n)+strconv.Itoa(i)+strconv.Itoa(n/i)) {
+			fmt.Printf("Pandigital:%d = %d * %d\n", n, i, n/i)
+			return true
+		}
+	}
+	return false
+}
+
+func isPandigital(s string) bool {
+	var ss []string
+	for _, c := range s {
+		ss = append(ss, string(c))
+	}
+	sort.Strings(ss)
+	s = ""
+	for _, c := range ss {
+		s += c
+	}
+	return s == "123456789"
+}

32_pandigital_products/main_test.go

@@ -0,0 +1,63 @@
+package main
+
+import (
+	"testing"
+)
+
+func Test_isPandigital(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			"912345678",
+			args{"912345678"},
+			true,
+		},
+		{
+			"12345678",
+			args{"12345678"},
+			false,
+		},
+		{
+			"812349756",
+			args{"812349756"},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := isPandigital(tt.args.s); got != tt.want {
+				t.Errorf("isPandigital() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}
+
+func Test_hasPandigitalProduct(t *testing.T) {
+	type args struct {
+		n int
+	}
+	tests := []struct {
+		name string
+		args args
+		want bool
+	}{
+		{
+			"7254",
+			args{7254},
+			true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if got := hasPandigitalProduct(tt.args.n); got != tt.want {
+				t.Errorf("hasPandigitalProduct() = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}