Array-> Contains duplicate[Using Hasmap]
1234567891011121314151617181920
import java.util.*;
class Main {
public static boolean containsDuplicate(int[] nums) {
HashMap<Integer,Integer> map = new HashMap();
for(int i=0;i<nums.length;i++){
if(map.containsKey(nums[i])){
return true;
}
else{
map.put(nums[i],i);
}
}
return false;
}
public static void main(String[] args) {
int nums[]={1,2,3,1};
System.out.println(containsDuplicate(nums));
}
}
Java
INFO