044. Yoda Translator

Codeforces

IDCF10269044

Time1000ms

Memory256MB

Difficulty—

English · Original

Formal · Original

Yoda tends to confuse people with his irregular syntax. Write a program that takes in a string and switches the first half of the words with the second half. A line will contain a string. For the input, your program must print that string with the first and second half of the words switched. Assume the input will always have an even number of words. ## Input A line will contain a string. ## Output For the input, your program must print that string with the first and second half of the words switched. [samples] ## Note Assume the input will always have an even number of words.

**Definitions** Let $ S $ be a string consisting of $ 2n $ words (for some $ n \in \mathbb{Z}^+ $), separated by single spaces. Let $ W = (w_1, w_2, \dots, w_{2n}) $ be the sequence of words in $ S $, where each $ w_i $ is a non-empty substring of $ S $ delimited by spaces. **Constraints** 1. The number of words in $ S $ is even: $ |W| = 2n $ for some $ n \geq 1 $. 2. Words are separated by exactly one space. 3. No leading or trailing spaces in input. **Objective** Construct a new string $ S' $ by swapping the first half of words with the second half: $$ S' = \text{join}\left( (w_{n+1}, w_{n+2}, \dots, w_{2n}, w_1, w_2, \dots, w_n), \text{ } \right) $$ where $ \text{join}(L, \text{ }) $ concatenates the list $ L $ of words with single spaces between them.

API Response (JSON)

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