/in/foo.cc: In function 'int main()':
/in/foo.cc:63:18: warning: array subscript has type 'char' [-Wchar-subscripts]
      cunzai[cur.c] = false;
                  ^
/in/foo.cc:81:25: warning: array subscript has type 'char' [-Wchar-subscripts]
     if (cunzai[bianliang]) err = true;
                         ^
/in/foo.cc:82:21: warning: array subscript has type 'char' [-Wchar-subscripts]
     cunzai[bianliang] = true;
                     ^
/in/foo.cc:93:11: warning: unused variable 'qidian' [-Wunused-variable]
       int qidian = stoint(x);
           ^~~~~~
/in/foo.cc:94:11: warning: unused variable 'zhongdian' [-Wunused-variable]
       int zhongdian = stoint(y);
           ^~~~~~~~~