/in/foo.cc: In function 'bool two(std::__cxx11::string, int)':
/in/foo.cc:15:6: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(i==s.length()-1){
~^~~~~~~~~~~~~~
/in/foo.cc: In function 'bool one(std::__cxx11::string, int)':
/in/foo.cc:24:6: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
if(i==s.length()-1){
~^~~~~~~~~~~~~~
/in/foo.cc: In function 'SuanShi huajian(std::__cxx11::string)':
/in/foo.cc:47:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<s.length();i++) {
~^~~~~~~~~~~
/in/foo.cc:171:14: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
if(yudeng=0){
^
/in/foo.cc:40:6: warning: unused variable 'a' [-Wunused-variable]
int a=0;
^