/in/foo.cc: In function 'void add(std::string)':
/in/foo.cc:11:13: error: 'size' was not declared in this scope
   11 |         t = size(a);
      |             ^~~~
/in/foo.cc:10:16: warning: unused variable 'j' [-Wunused-variable]
   10 |         int i, j, t, flag,x,y,z,bz;
      |                ^
/in/foo.cc:10:22: warning: unused variable 'flag' [-Wunused-variable]
   10 |         int i, j, t, flag,x,y,z,bz;
      |                      ^~~~
/in/foo.cc: In function 'int judge(std::string)':
/in/foo.cc:33:13: error: 'size' was not declared in this scope
   33 |         t = size(a);
      |             ^~~~
/in/foo.cc:32:16: warning: unused variable 'j' [-Wunused-variable]
   32 |         int i, j, t,flag;
      |                ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:47:13: error: 'length' was not declared in this scope
   47 |         m = length(s);
      |             ^~~~~~
/in/foo.cc:44:20: warning: unused variable 'j' [-Wunused-variable]
   44 |         int  m, i, j, k, t;
      |                    ^
/in/foo.cc:44:23: warning: unused variable 'k' [-Wunused-variable]
   44 |         int  m, i, j, k, t;
      |                       ^
/in/foo.cc:44:26: warning: unused variable 't' [-Wunused-variable]
   44 |         int  m, i, j, k, t;
      |                          ^