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69 方法： 方法 方法 方法 unique1arr newArr isRepeated i iLen arr. i iLen i isRepeated j jLen newArr. j jLen j arri newArrj isRepeated isRepeated newArr.arri newArr unique2arr hashMap ..arr item hashMapitem hashMapitem unique3arr ..arr item index arr.item index unique4arr arr. newArr arr i len arr. i len i arri newArrnewArr. newArr.arri newArr
