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dimitar's solution for 100: Most Used Character, written in Java
public class MostUsedCharacter { public String mostUsed(String sentence) { String[] s = sentence.split("[ *]"); int max = 0, br; char ret = ' '; for (int i=97; i<=122; i++) { br = 0; for (int j=0; j<s.length; j++) if (s[j].contains(Character.toString((char)i))) ++br; if (br > max) { max = br; ret = (char)i; } } return Character.toString((char)ret); } }