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First Unique Character in a String
//'main' method must be in a class 'Rextester'. //Compiler version 1.8.0_111 import java.util.*; import java.lang.*; class Rextester { public static void main(String args[]) { System.out.println("Hello, World!"); System.out.println(firstUniqChar("aadadaad")); } public static int firstUniqChar(String s) { int[] freq = new int[26]; for(char c:s.toCharArray()) freq[c-'a'] +=1; for(int i=0;i<s.length();i++) if(freq[s.charAt(i)-'a'] == 1) return i; return -1; } }
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