/in/foo.cc:17:16: warning: extra tokens at end of #include directive
 #include <list>　　
                ^
/in/foo.cc:18:15: warning: extra tokens at end of #include directive
 #include <map>　　
               ^
/in/foo.cc:23:19: warning: extra tokens at end of #include directive
 #include <istream>　　　　
                   ^
/in/foo.cc:24:19: warning: extra tokens at end of #include directive
 #include <ostream>　　　　
                   ^
/in/foo.cc:25:17: warning: extra tokens at end of #include directive
 #include <queue>　　　　　
                 ^
/in/foo.cc:26:15: warning: extra tokens at end of #include directive
 #include <set>　　　　　　
               ^
/in/foo.cc:27:19: warning: extra tokens at end of #include directive
 #include <sstream>　　　　
                   ^
/in/foo.cc:28:17: warning: extra tokens at end of #include directive
 #include <stack>　　　　　
                 ^
/in/foo.cc:29:21: warning: extra tokens at end of #include directive
 #include <stdexcept>　　　
                     ^
/in/foo.cc:30:21: warning: extra tokens at end of #include directive
 #include <streambuf>　　　
                     ^
/in/foo.cc:31:18: warning: extra tokens at end of #include directive
 #include <string>　　　
                  ^
/in/foo.cc:32:19: warning: extra tokens at end of #include directive
 #include <utility>　　　　
                   ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:44:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=1;i<=k.size();i++)
              ~^~~~~~~~~~