已知稀疏矩阵A和B，编程实现基于三元组顺序表实现A+B的运算，请生成三个不同的python程序

程序一：

class Triplet:
    def __init__(self, row, col, value):
        self.row = row
        self.col = col
        self.value = value

def add_sparse_matrix(A, B):
    rows = max(A[i].row for i in range(len(A))) + 1
    cols = max(A[i].col for i in range(len(A))) + 1
    C = []
    for i in range(rows):
        for j in range(cols):
            a = 0
            b = 0
            for k in range(len(A)):
                if A[k].row == i and A[k].col == j:
                    a = A[k].value
                    break
            for k in range(len(B)):
                if B[k].row == i and B[k].col == j:
                    b = B[k].value
                    break
            if a + b != 0:
                C.append(Triplet(i, j, a + b))
    return C

程序二：

class Triplet:
    def __init__(self, row, col, value):
        self.row = row
        self.col = col
        self.value = value

def add_sparse_matrix(A, B):
    rows = max(A, key=lambda x: x.row).row + 1
    cols = max(A, key=lambda x: x.col).col + 1
    C = []
    i = j = 0
    while i < len(A) and j < len(B):
        if A[i].row < B[j].row or (A[i].row == B[j].row and A[i].col < B[j].col):
            C.append(A[i])
            i += 1
        elif A[i].row == B[j].row and A[i].col == B[j].col:
            if A[i].value + B[j].value != 0:
                C.append(Triplet(A[i].row, A[i].col, A[i].value + B[j].value))
            i += 1
            j += 1
        else:
            C.append(B[j])
            j += 1
    while i < len(A):
        C.append(A[i])
        i += 1
    while j < len(B):
        C.append(B[j])
        j += 1
    return C

程序三：

class Triplet:
    def __init__(self, row, col, value):
        self.row = row
        self.col = col
        self.value = value

def add_sparse_matrix(A, B):
    rows = max(A, key=lambda x: x.row).row + 1
    cols = max(A, key=lambda x: x.col).col + 1
    C = []
    for i in range(rows):
        for j in range(cols):
            a = next((x for x in A if x.row == i and x.col == j), None)
            b = next((x for x in B if x.row == i and x.col == j), None)
            if a and b:
                if a.value + b.value != 0:
                    C.append(Triplet(i, j, a.value + b.value))
            elif a:
                C.append(a)
            elif b:
                C.append(b)
    return C

三个程序都是基于三元组顺序表实现稀疏矩阵加法的，采用了不同的算法思路，具体实现方式略有差异。