Counts of Distinct Consecutive Substring of Length Two Using C++ STL

In this tutorial, we will be discussing a program to count distinct consecutive sub-string of length two using C++ STL.

For this we will provided with a string. Our task is to count and print all the unique substrings of length two from the given string.

Example

 Live Demo

#include<bits/stdc++.h>
using namespace std;
void calc_distinct(string str){
   map<pair<char,char>, int> dPairs;
   for (int i=0; i<str.size()-1; i++)
      dPairs[make_pair(str[i], str[i+1])]++;
   cout << "Distinct sub-strings with counts:\n";
   for (auto it=dPairs.begin(); it!=dPairs.end(); it++)
      cout << it->first.first << it->first.second << "-" << it->second << " ";
}
int main(){
   string str = "abcacdcacabacaassddssklac";
   calc_distinct(str);
   return 0;
}

Output

Distinct sub-strings with counts:
aa-1 ab-2 ac-4 as-1 ba-1 bc-1 ca-4 cd-1 dc-1 dd-1 ds-1 kl-1 la-1 sd-1 sk-1 ss-2