/in/foo.cc: In function 'int main()':
/in/foo.cc:18:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<k[0].length();i++)
                ^
/in/foo.cc:31:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<k[1].length()&&(f||ff);i++)
                ^
/in/foo.cc:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<k[2].length()&&(f||ff);i++)
                ^
/in/foo.cc:57:12: warning: 'mm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<m<<mm<<endl;
            ^
/in/foo.cc:57:9: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   cout<<m<<mm<<endl;
         ^