将邻接表乘以 -1

Question

g = [
    [4, 7],
    [3],
    [4, 5],
    [4],
    [2],
    [0]
]

我正在尝试使用这段代码乘以上面的邻接表：

for i in range(len(g)):
    for j in g[i]:
        g[i] = [j * (-1) for j in g[i]]
        

print(g)

我得到的结果是：

[[4, 7], [-3], [4, 5], [-4], [-2], [0]]

我需要更改什么才能使所有列表都为负数？

Answer 1

将子列表中的每个元素乘以-1:

g = [[4, 7], [3], [4, 5], [4], [2], [0]]

g_neg = [[v * -1 for v in subl] for subl in g]
print(g_neg)

打印：

[[-4, -7], [-3], [-4, -5], [-4], [-2], [0]]

Multiply adjacency list by -1