for循环后弹出元素时列表索引超出范围

如何解决for循环后弹出元素时列表索引超出范围

def main():
    hash_table = [
        [75],[95,64],[17,47,82],[18,35,87,10],[20,82,65],[19,1,23,75,3,34],[88,2,77,73,7,63,67],[99,65,4,28,6,16,70,92],[41,41,26,56,83,40,80,33],48,72,33,32,37,94,29],[53,71,44,25,43,91,52,97,51,14],[70,11,17,78,39,68,57],[91,38,14,58,50,27,29,48],[63,66,89,53,67,30,69,31],[4,62,98,9,93,60,23]
    ]
    while(len(hash_table)!=1):
        for i in range(len(hash_table[-2])):
            hash_table[-2][i]=hash_table[-2][i]+max(hash_table[-1][i],hash_table[-1][i+1])
        hash_table.pop(-1)
        print(hash_table)


main()

这是欧拉问题18。运行正常，直到控制台中出现以下行：

[[75],[686,718,731,749]]

在此行之后，它将停止并引发错误。 这是控制台的全部输出：

C:\python3.85\python.exe C:/python_projects/algorithms/euler(18).py
Traceback (most recent call last):
  File "C:/python_projects/algorithms/euler(18).py",line 26,in <module>
    main()
  File "C:/python_projects/algorithms/euler(18).py",line 21,in main
    hash_table[-2][i]=hash_table[-2][i]+max(hash_table[-1][i],hash_table[-1][i+1])
IndexError: list index out of range
[[75],[125,164,102,95,112,123,165,128,166,109,122,147,100,54]]
[[75],[255,235,154,150,140,179,256,209,224,172,174,176,148]]
[[75],[325,246,187,178,329,273,302,263,242,193,233]]
[[75],[378,317,231,321,354,372,393,360,293,247]]
[[75],[419,365,387,419,425,430,376,454,322]]
[[75],[460,434,475,508,470,510,524,487]]
[[75],[559,499,479,536,514,526,594,616]]
[[75],[647,501,613,609,533,657,683]]
[[75],[666,614,636,684,660,717]]
[[75],749]]

Process finished with exit code 1