C++Advanced-Multidimensional Arrays - Compare Matrices(with vector)

#include<iostream>
#include<vector>
#include<string>
#include<sstream>

std::vector<int> readVec1D() {
    std::vector<int> vec1D;
    std::string line;
    getline(std::cin, line);
    std::istringstream istr(line);
    int currNumb = 0;
    while (istr >> currNumb)
    {
        vec1D.push_back(currNumb);
    }

    return vec1D;
}

std::vector<std::vector<int>> readVec2D() {
    int rows = 0;
    std::cin >> rows;
    std::cin.ignore();
    std::vector<std::vector<int>> vec2D(rows);
    for (auto& row : vec2D)
    {
        row = readVec1D();
    }

    return vec2D;
}

std::vector<std::vector<std::vector<int>>> readVec3D(int size) {
    std::vector<std::vector<std::vector<int>>> vec3D(size);
    for (auto& vec2D : vec3D)
    {
        vec2D = readVec2D();
    }

    return vec3D;
}

bool areEqual(const std::vector<int>& first,
              const std::vector<int>& second) {
    const size_t firstSize = first.size();
    if (firstSize != second.size())
    {
        return false;
    }
    for (size_t i = 0; i < firstSize; i++)
    {
        if (first[i] != second[i])
        {
            return false;
        }
    }

    return true;
}

bool areEqual(const std::vector<std::vector<int>>& first,
              const std::vector<std::vector<int>>& second) {
    const size_t firstSize = first.size();
    if (firstSize != second.size())
    {
        return false;
    }
    for (size_t i = 0; i < firstSize; i++)
    {
        const bool areVecsEqual = areEqual(first[i], second[i]);
        if (!areVecsEqual)
        {
            return false;
        }
    }

    return true;
}

void printSolution(const bool areMatrixesEqual) {
    std::cout << (areMatrixesEqual ? "equal" : "not equal") << std::endl;
}

int main() {
    const int numVectors = 2;
    const auto vec3D = readVec3D(numVectors);
    const bool areMatrixesEqual = areEqual(vec3D[0], vec3D[1]);
    printSolution(areMatrixesEqual);

    return 0;
}