#1324. 位运算-低位
位运算-低位
21 & ((1<<3)-1) =({{ input(1) }})
13 & ((1<<2)-1) =({{ input(2) }})
21 & ((1<<3)-1) =({{ input(1) }})
13 & ((1<<2)-1) =({{ input(2) }})
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