将矩阵追加到stl矩阵(2d std::vector)

#include <vector>

// 将矩阵B追加到矩阵A的末尾
void appendMatrix(std::vector<std::vector<int>>& A, const std::vector<std::vector<int>>& B) {
    A.insert(A.end(), B.begin(), B.end());
}

#include <vector>

// 将矩阵B追加到矩阵A的末尾
void appendMatrix(std::vector<std::vector<int>>& A, const std::vector<std::vector<int>>& B) {
    int rowsA = A.size();
    int rowsB = B.size();
    int colsB = B[0].size();

    A.resize(rowsA + rowsB, std::vector<int>(colsB));

    for (int i = 0; i < rowsB; i++) {
        for (int j = 0; j < colsB; j++) {
            A[rowsA + i][j] = B[i][j];
        }
    }
}