sorting vector of vector of strings in C++

Question

I am having trouble to figure out, how to sort a vector of vector of strings, here is the testing code.

#include <iostream>
#include <vector>
#incl         


        

Answer 1

I'm going to assume each vector represents an record of some type, and compare the internal strings from left to right. Obviously the sorter() code is easily replaceable. You should to add a sorter() function somewhere to your code, and pass it to the std::sort algorithm.

bool sorter(const std::vector& left, const std::vector& right)
{
    //go through each column
    for(int i=0; i right[i])
            return true;
        // if left is "less" return that we go lower
        else if (left[i] < right[i])
            return false;
    }
    // if left is longer, it goes higher
    if (left.size() > right.size())
        return true;
    else //otherwise, left go lower
        return false;
 }

 int main() {
     std::vector  > data_var;
     //...

     //sorting code here...
     std::sort(data_var.begin(), data_var.end(), sorter);

     //...
 }