This is a beautiful solution.

Shouldn't it be in all the languages?
"Task: Given an integral number of watermelons w (1 ≤ w ≤ 100; 1 ≤ w ), check whether Pete and Billy can divide the melons so that each of them gets an even amount."
In the test cases, it only verifies up to 100.

In the instructions they give (1 <= w < 100). Isn't there a problem with the test cases? There is no comparison for anything higher than 100.