Data Structure
Networking
RDBMS
Operating System
Java
MS Excel
iOS
HTML
CSS
Android
Python
C Programming
C++
C#
MongoDB
MySQL
Javascript
PHP
Physics
Chemistry
Biology
Mathematics
English
Economics
Psychology
Social Studies
Fashion Studies
Legal Studies
- Selected Reading
- UPSC IAS Exams Notes
- Developer's Best Practices
- Questions and Answers
- Effective Resume Writing
- HR Interview Questions
- Computer Glossary
- Who is Who
XOR of Prime Frequencies of Characters in a String in C++
In this problem, we are given a string of characters, our task is to print the XOR of frequencies of characters of the string whose frequency of occurrence is a prime number.
Let’s take an example to understand the problem,
Input − TutorialsPoint
Output −
Here, we will check the frequency of occurrence of each character of the string and then find XOR of all the characters whose frequency is a prime number. For this will create an array of prime frequencies. Then we will store frequencies of characters of a string in a map and then matching with prime frequency array. If a match is found the xor is found, on looping to all elements of the map we can find the required XOR’s.
Example
Program to show the implementation of our solution,
#include <bits/stdc++.h>
using namespace std;
void findPrimes(bool prime[], int p_size){
prime[0] = false;
prime[1] = false;
for (int p = 2; p * p <= p_size; p++) {
if (prime[p]) {
for (int i = p * 2; i <= p_size; i += p)
prime[i] = false;
}
}
}
int findPrimeXOR(string s){
bool prime[100005];
memset(prime, true, sizeof(prime));
findPrimes(prime, 10005);
int i, j;
map<char, int> charFreq;
for (i = 0; i < s.length(); i++)
charFreq[s[i]]++;
int result = 0;
int flag = 0;
for (auto i = charFreq.begin(); i != charFreq.end(); i++) {
if (prime[i->second]) {
result = result ^ i->second;
flag = 1;
}
}
if (!flag)
return -1;
return result;
}
int main(){
string s = "tutorialspoint";
cout<<"The XOR of frequencies of character which have prime frequencies is : ";
cout<<findPrimeXOR(s);
return 0;
}Output
The XOR of frequencies of character which have prime frequencies is : 3
Updated on: 20-Apr-2020
85 Views
Advertisements