20201201

20201201/main.go

@@ -0,0 +1,46 @@
+package main
+
+func main() {
+
+}
+
+func isEcho(s string) bool {
+	if s == "" {
+		return false
+	}
+	l := 0
+	r := len(s) - 1
+	for r >= l {
+		if s[l] != s[r] {
+			return false
+		}
+		l++
+		r--
+	}
+	return true
+}
+
+func isAlmostEcho(s string) bool {
+	if s == "" {
+		return false
+	}
+	l := 0
+	r := len(s) - 1
+	for r >= l {
+		if s[l] != s[r] && !isEcho(removeIndex(l, s)) && !isEcho(removeIndex(r, s)) {
+			return false
+		}
+		l++
+		r--
+	}
+	return true
+}
+
+func removeIndex(index int, s string) string {
+	if index >= len(s) {
+		return s
+	}
+	ret := []rune(s)
+	ret = append(ret[0:index], ret[index+1:]...)
+	return string(ret)
+}