foo.cc: In function 'int Slove(long long int)':
foo.cc:6:1: warning: no return statement in function returning non-void [-Wreturn-type]
    6 | }
      | ^
foo.cc: In function 'int main()':
foo.cc:11:9: error: 'k' was not declared in this scope
   11 |         k=Slove(b);
      |         ^

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