Given a string str containing only lowercase characters. The task is to print the characters along with their frequencies in the order of their occurrence in the given string.
Examples:
Input: str = “neveropen”
Output: g2 e4 k2 s2 f1 o1 r1
Input: str = “helloworld”
Output: h1 e1 l3 o2 w1 r1 d1
Approach: Traverse the given string character by character and store the frequencies of all the strings in a LinkedHashMap which maintains the order of the elements in which they are stored. Now, iterate over the elements of the LinkedhashMap and print the contents.
Below is the implementation of the above approach:
Java
// Java implementation of the approachimport java.util.LinkedHashMap;public class GFG { // Function to print the characters and their // frequencies in the order of their occurrence static void printCharWithFreq(String str, int n) { // LinkedHashMap preserves the order in // which the input is supplied LinkedHashMap<Character, Integer> lhm = new LinkedHashMap<Character, Integer>(); // For every character of the input string for (int i = 0; i < n; i++) { // Using java 8 getorDefault method char c = str.charAt(i); lhm.put(c, lhm.getOrDefault(c, 0) + 1); } // Iterate using java 8 forEach method lhm.forEach( (k, v) -> System.out.print(k + " " + v)); } // Driver code public static void main(String[] args) { String str = "neveropen"; int n = str.length(); printCharWithFreq(str, n); }} |
Output:
g2 e4 k2 s2 f1 o1 r1