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- package isunique;
- import java.util.HashMap;
- import java.util.HashSet;
- import java.util.Map;
- import java.util.Set;
- public class app {
- public static void main(String[] args) {
- int[] intArray = {1, 2, 3, 4, 5, 6};
- System.out.println(isUnique(intArray));
- }
- public static boolean isUnique(int[] intArray) {
- Set<Integer> set = new HashSet<>(intArray.length);
- for (int i : intArray) {
- if(!set.add(i)){
- return true;
- }
- }
- return false;
- }
- }
- // time limit exceed
- // for (int i = 0; i < intArray.length; i++) {
- // for (int j = i + 1; j < intArray.length; j++) {
- // if(intArray[i]==intArray[j]){
- // return true;
- // }
- // }
- //
- // }
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