cpp-course/modules/04_arrays_and_strings/src/multidimensional.cpp

#include "multidimensional.hpp"

#include <algorithm>
#include <numeric>

namespace arrays {

auto create_matrix(const int rows, const int cols, const int fill) -> Matrix {
    return Matrix(rows, std::vector(cols, fill));
}

auto transpose(const Matrix& matrix) -> Matrix {
    auto new_mat = Matrix(matrix[0].size(), std::vector(matrix.size(), 0));
    for (size_t row = 0; row < matrix.size(); ++row) {
        for (size_t col = 0; col < matrix[row].size(); ++col) {
            new_mat[col][row] = matrix[row][col];
        }
    }
    return new_mat;
}

auto row_sums(const Matrix& matrix) -> std::vector<int> {
    auto sums = std::vector(matrix.size(), 0);
    auto idx = 0;
    for (auto row: matrix) {
        sums[idx] = std::ranges::fold_left(row, 0, std::plus{});
        idx++;
    }
    return sums;
}

}  // namespace arrays