Merge branch 'master' into printchessboard,robottoorigin,twosum

subjects/inverttree.en.md

@@ -1,5 +1,17 @@
 ## invert tree
 
+## **WARNING! VERY IMPORTANT!**
+
+For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
+
+This means that:
+
+- The package needs to be named `package main`.
+- The submitted code needs one declared function main(```func main()```) even if empty.
+- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
+- Every other rules are obviously the same than for a `program`.
+
+
 ### Instructions:
 Write a function that takes tree and inverts(flips) and returns it.
 ```

subjects/nauuo.en.md

@@ -1,10 +1,23 @@
 ## nauuo
 
+## **WARNING! VERY IMPORTANT!**
+
+For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
+
+This means that:
+
+- The package needs to be named `package main`.
+- The submitted code needs one declared function main(```func main()```) even if empty.
+- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
+- Every other rules are obviously the same than for a `program`.
+
 ### Instructions
 
 There was a vote. There are people who voted positively, negatively, and randomly. 
 Figure out if the final answer depends on random people or not.
-If it does print '?'
+If it does, return '?', otherwise the result must be either '+', '-', or '0'
+Previous characters stand for outcome of the vote: positive/negative/draw.
+Input is always positive.
 
 Write a function, `Nauuo`, that returns final result of voting.
 
@@ -46,4 +59,4 @@ student@ubuntu:~/[[ROOT]]/test$ ./test
 +
 -
 student@ubuntu:~/[[ROOT]]/test$
-```
+```

subjects/twosum.en.md

@@ -1,5 +1,16 @@
 ## twosum
 
+## **WARNING! VERY IMPORTANT!**
+
+For this exercise a function will be tested **with the exam own main**. However the student **still needs** to submit a structured program:
+
+This means that:
+
+- The package needs to be named `package main`.
+- The submitted code needs one declared function main(```func main()```) even if empty.
+- The function main declared needs to **also pass** the `Restrictions Checker`(illegal functions tester). It is advised for the student to just empty the function main after its own testings are done.
+- Every other rules are obviously the same than for a `program`.
+
 ### Instructions
 
 Given an array of integers, return indexes of the two numbers such that they add up to a specific target.
@@ -8,7 +19,7 @@ If there are more than one solution, return the first one.
 
 If there are no solutions, return nil.
 
-Expected function:
+Expected function :
 
 ```go
 func TwoSum(nums []int, target int) []int {