trace("-1%4",-1%4);

trace("0%4",0%4);

trace("3%4",3%4);

trace("5%4",5%4);

trace("9%4",9%4);

trace("15%4",15%4);

trace("64&4",64%4);

 

trace("-1&4",-1&(4-1));

trace("0&4",0&(4-1));

trace("3&4",3&(4-1));

trace("5&4",5&(4-1));

trace("9&4",9&(4-1));

trace("15&4",15&(4-1));

trace("64&4",64&(4-1));

//a & (n - 1) 等价于 a % n,是取模的典型做法。

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