Arranging two strings, C++ (vc++)

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#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <algorithm>
#include <numeric>
#include <assert.h>

typedef std::vector<std::string>::size_type size_t_t;

size_t_t effectiveFind(std::string val, const std::vector<std::string> &v1, const std::vector<std::string> &v2)
{
	for(std::vector<std::string>::size_type i = 0; i < v1.size(); i++)
	{
		if(v1[i] != v2[i])
		{
			if(v2[i] == val) return static_cast<size_t_t>(i);
		}
	}

assert(NULL); return 0;
}

std::string addSpace(std::string val) {return (val += ' ');}

std::string rearrange(std::string a, std::string b, size_t_t &numMoves)
{
	std::string val;
	size_t_t position;
	numMoves = 0;

std::vector<std::string> v1;
	std::vector<std::string> v2;

std::istringstream iss1(a);
	std::istringstream iss2(b);

while(iss1 >> val) v1.push_back(val);
	while(iss2 >> val) v2.push_back(val);
    
	assert(v1.size() && v2.size());
	assert(v1.size() == v2.size());

std::vector<std::string>::size_type i;
	for(i = 0; i < v1.size(); i++)
	{
		assert(std::count(v1.begin(), v1.end(), v1[i]) == std::count(v2.begin(), v2.end(), v1[i]));
        assert(std::count(v1.begin(), v1.end(), v2[i]) == std::count(v2.begin(), v2.end(), v2[i]));
	}

for(i = 0; i < v1.size(); i++)
	{
		if(v1[i] != v2[i])
		{
			position = effectiveFind(v1[i], v1, v2);
			std::swap(v2[i], v2[position]); 
			numMoves++;
		}
	}

std::transform(v2.begin(), v2.end() - 1, v2.begin(), addSpace);

return std::accumulate(v2.begin(), v2.end(), std::string());
}

int main()
{
	size_t_t numMoves;

// Emptying these strings mean you have to input them manually
	std::string line1 = "3 2 1 4 5"; // "3 2 1 4 5"
	std::string line2 = "2 3 1 4 5"; // "1 3 2 5 4"

std::cout << "Enter two strings : " << std::endl;

if(!line1.size() || !line2.size())
	{
		std::getline(std::cin, line1);
		std::getline(std::cin, line2);
	}
	else
	{
		std::cout << line1 << std::endl;
		std::cout << line2 << std::endl;
	}

line2 = rearrange(line1, line2, numMoves);

std::cout << std::endl;
	std::cout << line1 << std::endl;
	std::cout << line2 << std::endl;
	std::cout << numMoves << std::endl;

return 0;
}

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Compilation time: 2,26 sec, absolute running time: 0,32 sec, absolute service time: 2,6 sec