20201120

20201120/main.go

@@ -0,0 +1,38 @@
+package main
+
+func main() {
+
+}
+
+func turnOver(s string) string {
+	var letters []int32
+	m := make(map[int]int32)
+	for i, c := range s {
+		if isLetter(c) {
+			letters = append(letters, c)
+		} else {
+			m[i] = c
+		}
+	}
+	var ret []int32
+	for i := len(letters) - 1; i >= 0; i-- {
+		ret = append(ret, letters[i])
+	}
+	for k, v := range m {
+		ret = insert(ret, k, v)
+	}
+	return string(ret)
+}
+
+func isLetter(s int32) bool {
+	return (s >= 'a' && s <= 'z') || (s >= 'A' && s <= 'Z')
+}
+
+func insert(a []int32, index int, value int32) []int32 {
+	if len(a) == index { // nil or empty slice or after last element
+		return append(a, value)
+	}
+	a = append(a[:index+1], a[index:]...) // index < len(a)
+	a[index] = value
+	return a
+}