/in/foo.cc: In function 'int main()':
/in/foo.cc:20:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:20:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:21:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size();i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:22:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(j=0;j<=n-words[k].size();j++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:27:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:45:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:47:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(j=0;j<=n-words[k].size();j++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:53:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:71:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:71:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:73:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(j=0;j<=n-words[k].size();j++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:78:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:97:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:98:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size();i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:104:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:123:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:123:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:130:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:149:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:156:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:175:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:175:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:176:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size();i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:182:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:201:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:202:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size();i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:208:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~