Generate a sequence determined by the characters of a given string

In this article, we'll discuss an engaging problem related to strings and sequences in C++. The problem statement is "Generate a sequence determined by the characters of a given string". This problem is an excellent way to enhance your skills in string manipulation and sequence generation.

Problem Statement

Given a string, the task is to generate a sequence where each character of the string is replaced by its position in the English alphabet.

C++ Solution Approach

Our approach to this problem is straightforward. We will iterate over the string and for each character, we will calculate its position in the English alphabet. The position can be calculated as the ASCII value of the character minus the ASCII value of 'a' plus one.


Here's the C++ code that solves the problem −

#include <iostream>
#include <string>
#include <vector>
using namespace std;

vector<int> generateSequence(string str) {
   vector<int> sequence;
   for (char c : str) {
      int position = c - 'a' + 1;
   return sequence;

int main() {
   string str = "abc";
   vector<int> sequence = generateSequence(str);
   cout << "The generated sequence is: ";
   for (int num : sequence) {
      cout << num << " ";
   cout << endl;
   return 0;


The generated sequence is: 1 2 3 

Explanation with a Test Case

Let's consider the string "abc".

When we pass this string to the generateSequence function, it replaces each character with its position in the English alphabet. 'a' is replaced with 1, 'b' is replaced with 2, and 'c' is replaced with 3.

So, the function returns the sequence 1, 2, 3.


This problem shows how we can manipulate strings and generate sequences based on the characters of a string. It's an excellent problem to practice your C++ coding skills and to understand how to work with strings and sequences.

Updated on: 18-May-2023


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