foo.cc: In function 'int main()':
foo.cc:13:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(x[i]==0&&y[j]==2||x[i]==2&&y[j]==5||x[i]==5&&y[j]==0)a++;
     ~~~~~~~^~~~~~~~~
foo.cc:13:48: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(x[i]==0&&y[j]==2||x[i]==2&&y[j]==5||x[i]==5&&y[j]==0)a++;
                                         ~~~~~~~^~~~~~~~~

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