class Solution { public int firstUniqChar(String s) { HashMap<Character,Integer> map = new HashMap<>(); for(char ch : s.toCharArray()) map.put(ch , map.getOrDefault(ch,0)+1); for(int i = 0 ; i < s.length() ;i++){ char ch = s.charAt(i); if(map.get(ch)==1) return i; } return -1; } }
Preview:
downloadDownload PNG
downloadDownload JPEG
downloadDownload SVG
Tip: You can change the style, width & colours of the snippet with the inspect tool before clicking Download!
Click to optimize width for Twitter