feat: add golang solution to lcci problem: No.01.01.Is Unique

Author: maolonglong

lcci/01.01.Is Unique/README.md

@@ -91,6 +91,22 @@ class Solution {
 };
 ```
 
+### **Go**
+
+```go
+func isUnique(astr string) bool {
+	bitmap := 0
+	for _, r := range astr {
+		pos := r - 'a'
+		if (bitmap & (1 << pos)) != 0 {
+			return false
+		}
+		bitmap |= (1 << pos)
+	}
+	return true
+}
+```
+
 ### **...**
 
 ```

lcci/01.01.Is Unique/README_EN.md

@@ -88,6 +88,22 @@ class Solution {
 };
 ```
 
+### **Go**
+
+```go
+func isUnique(astr string) bool {
+	bitmap := 0
+	for _, r := range astr {
+		pos := r - 'a'
+		if (bitmap & (1 << pos)) != 0 {
+			return false
+		}
+		bitmap |= (1 << pos)
+	}
+	return true
+}
+```
+
 ### **...**
 
 ```

lcci/01.01.Is Unique/Solution.go

@@ -0,0 +1,11 @@
+func isUnique(astr string) bool {
+	bitmap := 0
+	for _, r := range astr {
+		pos := r - 'a'
+		if (bitmap & (1 << pos)) != 0 {
+			return false
+		}
+		bitmap |= (1 << pos)
+	}
+	return true
+}