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The code does not implement the permuted index. Instead of

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox

it produces

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox 

Notice that the order is wrong. The permuted index shall be sorted by the second column.

using namespace std; is considered bad practice.

Never #include a .cpp file. See for example this discussion for details.

Try not use so many strings. It hurts both memory usage and performance. In fact there is no need to break the initial string into words and reconstruct left and right strings. A vector of whitespace locations in the original string suffices.

The code does not implement the permuted index. Instead of

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox

it produces

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox 

Notice that the order is wrong. The permuted index shall be sorted by the second column.

using namespace std; is considered bad practice.

Never #include a .cpp file. See for example this discussion for details.

Try not use so many strings. It hurts both memory usage and performance. In fact there is no need to break the initial string into words and reconstruct left and right strings. A vector of whitespace locations in the original string suffices.

The code does not implement the permuted index. Instead of

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox

it produces

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox 

Notice that the order is wrong. The permuted index shall be sorted by the second column.

using namespace std; is considered bad practice.

Never #include a .cpp file. See for example this discussion for details.

The code does not implement the permuted index. Instead of

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox

it produces

 The quick brown fox 
 The quick brown fox 
 The quick brown fox 
 The quick brown fox 

Notice that the order is wrong. The permuted index shall be sorted by the second column.

using namespace std; is considered bad practice.

Never #include a .cpp file. See for example this discussion for details.

Try not use so many strings. It hurts both memory usage and performance. In fact there is no need to break the initial string into words and reconstruct left and right strings. A vector of whitespace locations in the original string suffices.