The classic example is a GUI where your program must respond when the user does something like press a key or move the mouse.
经典的例子便是GUI，程序必须响应用户的某些行为，比如按键或是鼠标移动。
Your program must find all sets of words in the dictionary which can be formed from the letters in each phrase.
对于每一个短语，字典中可能存在多个可以重组为该短语的单词集合，你的程序要把所有这些单词集合都找出来。
Your program must number all icons (even invisible ones) in the order of arrival starting from 1 and label regions alphabetically in the order of arrival starting from 'A'.
你的程序应该按输入的顺序从1开始对图标进行编号，并按照输入的顺序从“A”开始以字母表对区域进行编号。
Your program must number all icons (even invisible ones) in the order of arrival starting from 1 and label regions alphabetically in the order of arrival starting from 'A'.
你的程序应该按输入的顺序从1开始对图标进行编号，并按照输入的顺序从“A”开始以字母表对区域进行编号。
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