HashMap-> First Recurring character
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import java.util.*;
class Main {
public static int returnFirstRec(int[] qstn){
HashMap<Integer, Integer> map = new HashMap();
for(int i=0;i<qstn.length;i++){
if(!map.containsKey(qstn[i])){
map.put(qstn[i], 1);
}
else{
return qstn[i];
}
}
return -1;
}
public static void main(String[] args) {
int[] qstn = {2,5,1,2,3,4};
System.out.println(returnFirstRec(qstn));
}
}
Java
INFO