- 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
C++ program to find how many characters should be rearranged to order string in sorted form
Suppose we have a string S with n characters. S contains lowercase letters only. We must select a number k in range 0 to n, then select k characters from S and permute them in any order. In this process, the remaining characters will remain unchanged. We perform this whole operation exactly once. We have to find the value of k, for which S becomes sorted in alphabetical order.
So, if the input is like S = "acdb", then the output will be 3, because 'a' is at the correct place and remaining characters should be rearranged.
Steps
To solve this, we will follow these steps −
n := size of S d := S sort the array d j := 0 for initialize i := 0, when i < n, update (increase i by 1), do: if S[i] is not equal to d[i], then: (increase j by 1) return j
Example
Let us see the following implementation to get better understanding −
#include <bits/stdc++.h> using namespace std; int solve(string S) { int n = S.size(); string d = S; sort(d.begin(), d.end()); int j = 0; for (int i = 0; i < n; i++) { if (S[i] != d[i]) j++; } return j; } int main() { string S = "acdb"; cout << solve(S) << endl; }
Input
"acdb"
Output
3
Advertisements