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Input data between the three - digit 0 - 9, start running, by one per second.
定时减法计数.输入数据0到9之间三位数, 开始计时, 每秒减一.
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How many three - digit positive integers have their sum of digits divisible by 3?
有多少个三位正整数的数字之和可被3整除?
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