v2

#include <iostream>

int main() {
    size_t sizeX, sizeY;
    std::cout << "Enter X size of matrix: ";
    std::cin >> sizeX;
    std::cout << "Enter Y size of matrix: ";
    std::cin >> sizeY;

    int** matrix = new int*[sizeY];
    for (size_t i = 0; i < sizeY; i++) {
        matrix[i] = new int[sizeX];
        for (size_t j = 0; j<sizeX; j++) {
            std::cout << "Position X: " << j << " Y: " << i << ". Enter: ";
            std::cin>>matrix[i][j];
        }
    }

    size_t* maximumIndexes = new size_t[sizeY];
    for (size_t i = 0; i < sizeY; i++) {
        int max = matrix[i][0];
        maximumIndexes[i] = 0;
        for (size_t j = 0; j<sizeX; j++) {
            if (max < matrix[i][j]) {
                max = matrix[i][j];
                maximumIndexes[i] = j;
            }
        }
    }

    for (size_t i = 0; i < sizeY; i++) {
        std::cout << "Index of max element (" << i << " row): " << maximumIndexes[i] << std::endl;
    }

    for (size_t i = 0; i < sizeY; i++)
        delete[] matrix[i];
    delete[] matrix;

    return 0;
}