#!/usr/bin/perl # # 用grep map 获取两个列表的交集并集、补集 # use strict; my @a=("a","b","c","d","e"); my @b=("b","g","f","e"); print "列表a数据： @a \n"; print "列表b数据: @b \n"; my %a = map{$_ => 1} @a; my %b = map{$_ => 1} @b; my @c = map{$_ => 1} @a;     # => 操作符起到了hash赋值的作用 # @a @b 交集 my @inter = grep {$a{$_}} @b;     # 求交集 print "交集：@inter \n"; # @a,@b 并集 my %merge = map {$_ => 1} @a,@b;  # 求并集 my @merge = keys (%merge); print "并集：@merge \n"; # @a,@b的补集@ca，@cb，即@a和@b相对于@merge的补集 my @ca = grep {!$a{$_}} @merge; my @cb = grep {!$b{$_}} @merge; print "\@a的补集:@ca \n"; print "\@b的补集:@cb \n";