思路:入隊(duì):只將棧s1作為入隊(duì)。出隊(duì):將棧s2作為出隊(duì),如果棧s1不為空,s2為空,出隊(duì)時(shí)將s1的元素倒入s2中,再pop();否則s2不為空,出隊(duì)時(shí)直接在棧s2中pop();#include
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