foo.cc:7:1: error: '__int64' does not name a type; did you mean '__int64_t'?
    7 | __int64 factory[PermSize] = { 0,1,2,6,24,120,720,5040,40320,362880,3628800,39916800,479001600,6227020800,87178291200,1307674368000,20922789888000,355687428096000,6402373705728000,121645100408832000,2432902008176640000};
      | ^~~~~~~
      | __int64_t
foo.cc: In function 'void Uncantor(int, int)':
foo.cc:17:17: error: 'factory' was not declared in this scope
   17 |      if(k==0 || factory[n-i-1]==0)  // 当其中一个为0是以是最后一次进行操作
      |                 ^~~~~~~

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