foo.cc: In function ‘int w(int, int, int)’:
foo.cc:9:37: warning: left operand of comma operator has no effect [-Wunused-value]
    9 |         else if(a<b and b<c)return (a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c-1);
      |                                     ^
foo.cc:9:43: warning: right operand of comma operator has no effect [-Wunused-value]
    9 |         else if(a<b and b<c)return (a,b,c-1)+w(a,b-1,c-1)-w(a,b-1,c-1);
      |                                           ^
foo.cc:11:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   11 | int main()
      |         ^~
foo.cc:11:9: note: remove parentheses to default-initialize a variable
   11 | int main()
      |         ^~
      |         --
foo.cc:11:9: note: or replace parentheses with braces to value-initialize a variable
foo.cc:12:1: error: a function-definition is not allowed here before ‘{’ token
   12 | {
      | ^
foo.cc:14:2: error: expected ‘}’ at end of input
   14 | }
      |  ^
foo.cc:6:1: note: to match this ‘{’
    6 | {
      | ^

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