python - 链表的多项式减法计算
问题描述
我正在尝试使算法解决多项式的减法。在我的 Jupiter notebook 上,输出没有问题,但是程序评分系统给出了输出错误。所以,我想知道我的算法中是否存在错误答案或错误输出的可能性。
有四个输入
- 多项式 X 的项数
- 多项式 X
- 多项式 Y 的项数
- 多项式 Y
例如,当 多项式 X = 6x^4 - 5x^2 + 3x^1
和多项式 Y = 5x^2 + 2x^1 -4 ,
输入将是
3
6 4 -5 2 3 1
3
5 2 2 1 -4 0
接着,
我想用前面的空白打印减法结果。
因此输出(减法的结果:6x^4 - 10x^2 + x^1 + 4)将是
" "6 4 -10 2 1 1 4
这是我的算法。
class getNode:
def __init__(self,coef=None, exp=None, link=None):
self.head = None
self.coef = coef
self.exp = exp
self.next = None
self.size = 0
def append (self, coef, exp, link=None):
if self.size == 0:
self.head = getNode(coef, exp, link)
self.coef = coef
self.exp = exp
self.next = link
self.size += 1
else:
cur = self.head
while cur.next != None:
cur = cur.next
cur.next = getNode(coef, exp, link)
self.coef = coef
self.exp = exp
self.next = link
self.size += 1
def print_nd(self):
print(" ", end='')
cur = self.head
while cur.next != None:
if cur.exp != 0:
print(cur.coef, cur.exp, end=' ')
cur = cur.next
else:
print(cur.coef, end=' ')
cur = cur.next
if cur.exp != 0:
print(cur.coef, cur.exp, end=' ')
else:
print(cur.coef,end=' ')
return ""
a = int(input())
X = list(map(int, input().split( )))
b = int(input())
Y = list(map(int, input().split( )))
def subPoly(X, Y):
x = getNode()
y = getNode()
result = getNode()
global a
global b
for i in range(0, (a*2), 2):
x.append(X[i], X[i+1])
for j in range(0, (b*2), 2):
y.append(Y[j], Y[j+1])
while (x.head != None and y.head != None):
if (x.head.exp > y.head.exp):
result.append(x.head.coef, x.head.exp)
x.head = x.head.next
elif (x.head.exp < y.head.exp):
result.append((-y.head.coef), y.head.exp)
y.head = y.head.next
else:
diff = x.head.coef - y.head.coef
if (diff != 0):
result.append(diff,x.head.exp)
x.head = x.head.next
y.head = y.head.next
else:
x.head = x.head.next
y.head = y.head.next
while (x.head != None):
result.append(x.head.coef, x.head.exp)
x.head = x.head.next
while (y.head != None):
result.append(-y.head.coef, y.head.exp)
y.head = y.head.next
return result.print_nd()
if (a*2==len(X) and b*2==len(Y)):
print(subPoly(X,Y))
请告诉我是否有任何错误答案的可能性!谢谢 :)