/in/foo.cc: In function 'int main()':
/in/foo.cc:7:17: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         if(x1==0&&x2==n||x1==n&&x2==0||y1==0&&y2==m||y1==m&&y2==0)//两个点在对面
      |            ~~~~~^~~~~~~
/in/foo.cc:7:45: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         if(x1==0&&x2==n||x1==n&&x2==0||y1==0&&y2==m||y1==m&&y2==0)//两个点在对面
      |                                        ~~~~~^~~~~~~
/in/foo.cc:7:59: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         if(x1==0&&x2==n||x1==n&&x2==0||y1==0&&y2==m||y1==m&&y2==0)//两个点在对面
      |                                                      ~~~~~^~~~~~~
/in/foo.cc:9:41: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 if(!(x1==0&&y1==0&&x2==n&&y2==m||x1==n&&y1==m&&x2==0&&y2==0||x1==0&&y1==m&&x2==n&&y2==0||x1==n&&y1==0&&x2==0&&y2==m))
      |                      ~~~~~~~~~~~~~~~~~~~^~~~~~~
/in/foo.cc:9:97: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 if(!(x1==0&&y1==0&&x2==n&&y2==m||x1==n&&y1==m&&x2==0&&y2==0||x1==0&&y1==m&&x2==n&&y2==0||x1==n&&y1==0&&x2==0&&y2==m))
      |                                                                              ~~~~~~~~~~~~~~~~~~~^~~~~~~
/in/foo.cc:9:125: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 if(!(x1==0&&y1==0&&x2==n&&y2==m||x1==n&&y1==m&&x2==0&&y2==0||x1==0&&y1==m&&x2==n&&y2==0||x1==n&&y1==0&&x2==0&&y2==m))
      |                                                                                                          ~~~~~~~~~~~~~~~~~~~^~~~~~~