string/reverse-string

string/reverse-string.go

@@ -0,0 +1,44 @@
+/*
+Write a function that reverses a string. The input string is given as an array of characters s.
+
+You must do this by modifying the input array in-place with O(1) extra memory.
+
+
+
+Example 1:
+
+Input: s = ["h","e","l","l","o"]
+Output: ["o","l","l","e","h"]
+Example 2:
+
+Input: s = ["H","a","n","n","a","h"]
+Output: ["h","a","n","n","a","H"]
+
+
+Constraints:
+
+1 <= s.length <= 105
+s[i] is a printable ascii character.
+*/
+
+package main
+
+import "fmt"
+
+func main() {
+	reverseString([]byte(string([]rune{'h', 'e', 'l', 'l', 'o'})))
+}
+
+func reverseString(s []byte) {
+	start, end := 0, len(s)-1
+	for start <= end {
+		tmp := s[start]
+		s[start] = s[end]
+		s[end] = tmp
+
+		start++
+		end--
+	}
+
+	fmt.Println(string(s))
+}