/in/foo.cc:1:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/STACK:1024000000,1024000000") //加栈; 
 
/in/foo.cc:2:0: warning: ignoring #pragma G  [-Wunknown-pragmas]
 #pragma G++ optimize(2)
 
/in/foo.cc: In function 'int main()':
/in/foo.cc:42:9: warning: unused variable 'maxx' [-Wunused-variable]
     int maxx=0; 
         ^~~~