求教一下，阿里8.17笔试完美对
思路是统计每行中的每个元素与最后一个元素相减，减的值存到新数组，用tuple做哈希，遍历哈希，如果一个tuple的相反tuple在里面，就加对应的两个value相乘（tuple的value与-tuple的value），最后结果除2。用例过了，可提交就变0
实在不知道哪里错了 求大佬们帮忙看看
def result(a):
n=len(a)
k=len(a[0])
b=[[0 for i in range(k-1)]for j in range(n)]
for i in range(n):
for j in range(k-1):
b[i][j]=a[i][j]-a[i][k-1]
d=[]
for i in b:
d.append(tuple(i))
s={}
for i in d:
if i in s:s[i]+=1
else:s[i]=1
count=0
for i in s:
if reverse(i) in s:
count+=s[reverse(i)]*s[i]
return count // 2
def reverse(t:tuple)->tuple:#返回tuple的相反数
l=list(t)
for i in range(len(l)):
l[i]=-l[i]
return tuple(l)
str1 = input()
strs = str1.split()
n, m = int(strs[0]), int(strs[1])
a = []
for _ in range(n):
str_tmp = [int(i) for i in input().split()]
a.append(str_tmp)
print(result(a)) 
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