NSArray *array1 = @[@"1",@"2",@"3"];
NSArray *array2 = @[@"1",@"5",@"6"];
NSMutableSet *set1 = [NSMutableSet setWithArray:array1];
NSMutableSet *set2 = [NSMutableSet setWithArray:array2];
[set1 unionSet:set2]; //取并集后 set1中为1,2,3,5,6
[set1 intersectSet:set2]; //取交集后 set1中为1
[set1 minusSet:set2];
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