diff --git a/otus-01/src/otus/homework.clj b/otus-01/src/otus/homework.clj
index 82c8e9d..6a75ff5 100644
--- a/otus-01/src/otus/homework.clj
+++ b/otus-01/src/otus/homework.clj
@@ -1,5 +1,6 @@
 (ns otus.homework)
 
 
-(defn solution "Add your solution as fuction body here" [])
+(defn solution "Add your solution as fuction body here" []
+  (/ (+ 5.0 4.0 (- 2.0 (- 3.0 (+ 6.0 (/ 4.0 5.0))))) (* 3.0 (- 6.0 2.0) (- 2.0 7.0))))
 
diff --git a/otus-01/test/otus/homework_test.clj b/otus-01/test/otus/homework_test.clj
index 9cc096f..50bb99d 100644
--- a/otus-01/test/otus/homework_test.clj
+++ b/otus-01/test/otus/homework_test.clj
@@ -4,5 +4,5 @@
 
 
 (deftest s-expression-solution-test
-  (is (= (sut/solution) -0.2466666666666667)
+  (is (= (sut/solution) -0.24666666666666667)
       "solution function returns a correct answer"))
diff --git a/otus-02/src/otus_02/homework/palindrome.clj b/otus-02/src/otus_02/homework/palindrome.clj
index 591f98e..a0bef49 100644
--- a/otus-02/src/otus_02/homework/palindrome.clj
+++ b/otus-02/src/otus_02/homework/palindrome.clj
@@ -1,6 +1,11 @@
 (ns otus-02.homework.palindrome
   (:require [clojure.string :as string]))
 
-
-(defn is-palindrome [test-string])
-
+(defn is-palindrome
+  "Func for check strings on palyndrome"
+  [s]
+  {:pre [(not= s nil)]}
+  (let [test-string (as-> s $
+                        (string/lower-case $)
+                        (string/replace $ #"[^a-z]" ""))]
+    (= test-string (str/reverse test-string))))
diff --git a/otus-02/src/otus_02/homework/pangram.clj b/otus-02/src/otus_02/homework/pangram.clj
index dc5d34c..5f989fc 100644
--- a/otus-02/src/otus_02/homework/pangram.clj
+++ b/otus-02/src/otus_02/homework/pangram.clj
@@ -1,6 +1,11 @@
 (ns otus-02.homework.pangram
   (:require [clojure.string :as string]))
 
-
-(defn is-pangram [test-string])
-
+(defn is-pangram [test-string]
+  "Func for check strings on pangram"
+  {:pre [(not= test-string nil)]}
+  (let [set-chars (-> test-string
+                       string/lower-case
+                       (string/replace #"[^a-z]" "")
+                       set)]
+    (= (count set-chars) 26)))
diff --git a/otus-02/src/otus_02/homework/square_code.clj b/otus-02/src/otus_02/homework/square_code.clj
index 823a185..d4b5c41 100644
--- a/otus-02/src/otus_02/homework/square_code.clj
+++ b/otus-02/src/otus_02/homework/square_code.clj
@@ -1,4 +1,6 @@
-(ns otus-02.homework.square-code)
+(ns otus-02.homework.square-code
+  (:require [clojure.string :as string])
+  (:require [clojure.math :as math]))
 
 ;; Реализовать классический метод составления секретных сообщений, называемый `square code`.
 ;; Выведите закодированную версию полученного текста.
@@ -48,9 +50,31 @@
 "aohghn "
 "sseoau "
 
+(defn add-spaces [amount line]
+  (apply str (concat line (repeat amount " "))))
 
+(defn encode-string [input]
+  ;; убираем знаки препинания, пробелы и переводим в нижний регистр
+  ;; а после переводим строку в вектор (line)
+    (let [inner (-> input
+                  (string/lower-case)
+                  (string/replace #"[^a-z]" ""))
+          size (count inner)
+          rows (int (math/sqrt (count inner)))
+          columns (inc rows)
+          line (->> inner
+                    ;; добавляем пробелы к концу строки
+                   (add-spaces (- (* columns rows) size))
+                   (vec))]
 
-(defn encode-string [input])
-
-
-(defn decode-string [input])
+      (string/join " " (map #(apply str %)
+                            (partition rows
+                                       (replace line
+                                                (vec (loop [start 0
+                                                            rows 0
+                                                            l ()
+                                                            max (count line)
+                                                            step columns]
+                                                       (if (> rows (dec step))
+                                                         l
+                                                         (recur (inc start) (inc rows) (concat l (range start max step)) max step))))))))))