class Solution {
public int firstUniqChar(String s) {
if(s == null || s.length() == 0)
return -1;
int[] c= new int[26];
for(int i=0; i

class Solution {
public int firstUniqChar(String s) {
if(s == null || s.length() == 0)
return -1;
int[] c= new int[26];
for(int i=0; i