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Minimum rotations required to get the same string in C++
Problem statement
Given a string, we need to find the minimum number of rotations required to get the same string
Example
If input string is “bbbbb” then minimum 1 rotation is required
Algorithm
1. Initialize result = 0 2. Make a temporary string equals to original string concatenated with itself. 3. Take the substring of temporary string of size same as original string starting from second character i.e. index 1 4. Increment the counter 5. Check whether the substring becomes equal to original string. If yes, then break the loop. Else go to step 2 and repeat it from the next index
Example
#include <bits/stdc++.h>
using namespace std;
int getRotationCount(string str) {
string temp = str + str;
int n = str.length();
for (int i = 1; i <= n; ++i) {
string sub = temp.substr(i, str.size());
if (str == sub) {
return i;
}
}
return n;
}
int main() {
string str = "bbbbb";
cout << "Rotation count = " << getRotationCount(str) <<
endl;
return 0;
}When you compile and execute above program. It generates following output
Output
Rotation count = 1
Updated on: 23-Dec-2019
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