09/08/28 21:12:35
>>470
arr = [1,2,3,4,5,6,3]
hash = {}
hash.default = 0
arr.each {|x| hash[x] += 1 }
p hash.keys.select {|k| hash[k] > 1 }
09/08/28 21:12:35
>>470
arr = [1,2,3,4,5,6,3]
hash = {}
hash.default = 0
arr.each {|x| hash[x] += 1 }
p hash.keys.select {|k| hash[k] > 1 }