Question

我的图形计算周期有问题。我想

graph = {('S','A'): ('2','2'), ('A','S'): ('2','2'), ('S','B'): ('3','5'), ('B','S'): ('3','5'), ('S','C'): ('3','6'), ('C','S'): ('3','6'), ('B','D'): ('4','5'), ('D','B'): ('4','5'), ('A','C'): ('2','2'), ('D','C'): ('3','4'), ('C','D'): ('3','4'), ('T','C'): ('5','8'), ('C','T'): ('8','5'), ('T','D'): ('4','7'), ('D','T'): ('4','7')}

print(graph)

{('S', 'A'): ('2', '2'), ('S', 'C'): ('3', '6'), ('T', 'C'): ('5', '8'), ('A', 'S'): ('2', '2'), ('D', 'T'): ('4', '7'), ('C', 'D'): ('3', '4'), ('D', 'B'): ('4', '5'), ('S', 'B'): ('3', '5'), ('C', 'T'): ('8', '5'), ('C', 'S'): ('3', '6'), ('B', 'S'): ('3', '5'), ('T', 'D'): ('4', '7'), ('B', 'D'): ('4', '5'), ('D', 'C'): ('3', '4'), ('A', 'C'): ('2', '2')}

我想扩展图形，但不存在循环。例如： vs = 'S' vt = 'T'

('S', 'A'): ('2', '2'), ('S', 'B'): ('3', 5'), ('S', 'C'): ('3', '6')
展开：
- ('S', 'A', 'C') : ('S', 'A') + ('A', 'C') = ('2', '2') + ('2', '2') = ('4', '4')
- ('S', 'B', 'D') : ('S', 'B') + ('B', 'D') = ('3', '5') + ('4', '5') = ('7', '10')
- ('S', 'C', 'A') : not expand
- ('S', 'C', 'S') : not expand
- ('S', 'C', 'T') : ('S', 'C') + ('C', 'T') = ('3', '6') + ('5', '8') = ('8', '14')
- ('S', 'C', 'D') : ('S', 'C') + ('C', 'D') = ('3', '6') + ('3', '4') = ('6', '10')
输出（预期）：
- ('S', 'A', 'C') : ('4', '4')
- ('S', 'B', 'D') : ('7', '10')
- ('S', 'C', 'A') : not expand
- ('S', 'C', 'S') : not expand
- ('S', 'C', 'T') : ('8', '14')
- ('S', 'C', 'D') : ('6', '10')

您能帮我解决上述问题吗？非常感谢您。

Answer 1

我没有收到您的问题，但这是您希望的吗？

graph = {('S','A'): ('2','2'), ('A','S'): ('2','2'), ('S','B'): ('3','5'),
         ('B','S'): ('3','5'), ('S','C'): ('3','6'), ('C','S'): ('3','6'),
         ('B','D'): ('4','5'), ('D','B'): ('4','5'), ('A','C'): ('2','2'),
         ('D','C'): ('3','4'), ('C','D'): ('3','4'), ('T','C'): ('5','8'),
         ('C','T'): ('8','5'), ('T','D'): ('4','7'), ('D','T'): ('4','7')}

sub = {}

for keys, values in graph.items():
    for keys2, values2 in graph.items():
        if keys[1] == keys2[0]:
            key = keys + keys2[1:]
            valueB= int(values[0]) + int(values2[0])
            valueE = int(values[1]) + int(values2[1])
            value = (str(valueB), str(valueE))
            sub[key] = value
print(sub)

输出：

{('S', 'A', 'S'): ('4', '4'), ('S', 'A', 'C'): ('4', '4'), ('A', 'S', 'A'): ('4', '4'), ('A', 'S', 'B'): ('5', '7'), ('A', 'S', 'C'): ('5', '8'), ('S', 'B', 'S'): ('6', '10'), ('S', 'B', 'D'): ('7', '10'), ('B', 'S', 'A'): ('5', '7'), ('B', 'S', 'B'): ('6', '10'), ('B', 'S', 'C'): ('6', '11'), ('S', 'C', 'S'): ('6', '12'), ('S', 'C', 'D'): ('6', '10'), ('S', 'C', 'T'): ('11', '11'), ('C', 'S', 'A'): ('5', '8'), ('C', 'S', 'B'): ('6', '11'), ('C', 'S', 'C'): ('6', '12'), ('B', 'D', 'B'): ('8', '10'), ('B', 'D', 'C'): ('7', '9'), ('B', 'D', 'T'): ('8', '12'), ('D', 'B', 'S'): ('7', '10'), ('D', 'B', 'D'): ('8', '10'), ('A', 'C', 'S'): ('5', '8'), ('A', 'C', 'D'): ('5', '6'), ('A', 'C', 'T'): ('10', '7'), ('D', 'C', 'S'): ('6', '10'), ('D', 'C', 'D'): ('6', '8'), ('D', 'C', 'T'): ('11', '9'), ('C', 'D', 'B'): ('7', '9'), ('C', 'D', 'C'): ('6', '8'), ('C', 'D', 'T'): ('7', '11'), ('T', 'C', 'S'): ('8', '14'), ('T', 'C', 'D'): ('8', '12'), ('T', 'C', 'T'): ('13', '13'), ('C', 'T', 'C'): ('13', '13'), ('C', 'T', 'D'): ('12', '12'), ('T', 'D', 'B'): ('8', '12'), ('T', 'D', 'C'): ('7', '11'), ('T', 'D', 'T'): ('8', '14'), ('D', 'T', 'C'): ('9', '15'), ('D', 'T', 'D'): ('8', '14')}

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