/in/foo.cc: In function 'int main()':
/in/foo.cc:7:19: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    7 |         while(n>=a&&m>=b||n>=b&&m>=a)
      |               ~~~~^~~~~~
/in/foo.cc:9:23: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
    9 |                 if(n<m&&a>b||n>m&&a<b)swap(a,b);//n a同大 同小
      |                    ~~~^~~~~