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helpers/helpers.go

@@ -141,3 +141,48 @@ func stringPermHelper(str string, i int) []string {
 	}
 	return ret
 }
+
+func IntPermutations(inp []int) [][]int {
+	perms := intPermHelper(inp, 0)
+	var wrk [][]int
+	// Now de-dupe
+	for i := range perms {
+		var found bool
+		for j := range wrk {
+			if IntSlicesAreEqual(perms[i], wrk[j]) {
+				found = true
+				break
+			}
+		}
+		if !found {
+			wrk = append(wrk, perms[i])
+		}
+	}
+	return wrk
+}
+
+func intPermHelper(inp []int, i int) [][]int {
+	ret := [][]int{inp}
+	if i != len(inp) {
+		r := make([]int, len(inp))
+		copy(r, inp)
+		for j := i; j < len(r); j++ {
+			r[i], r[j] = r[j], r[i]
+			ret = append(ret, intPermHelper(r, i+1)...)
+			r[i], r[j] = r[j], r[i]
+		}
+	}
+	return ret
+}
+
+func IntSlicesAreEqual(s1 []int, s2 []int) bool {
+	if len(s1) != len(s2) {
+		return false
+	}
+	for k := range s1 {
+		if s1[k] != s2[k] {
+			return false
+		}
+	}
+	return true
+}