foo.cc: In function 'int main()':
foo.cc:6:3: warning: left operand of comma operator has no effect [-Wunused-value]
    6 |  1<=A,B<=50000;
      |  ~^~~
foo.cc:6:8: warning: right operand of comma operator has no effect [-Wunused-value]
    6 |  1<=A,B<=50000;
      |       ~^~~~~~~
foo.cc:7:3: warning: statement has no effect [-Wunused-value]
    7 |  A*B;
      |  ~^~

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