/in/foo.cc: In function 'int main()':
/in/foo.cc:21:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:21:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:22:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size() && i_find_it==0;i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:23:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(j=0;j<=n-words[k].size() && i_find_it==0;j++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:28:16: 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() && i_find_it==0;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:70:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:70:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:72:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(j=0;j<=n-words[k].size() && i_find_it==0;j++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:77:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:95:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:96:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size() && i_find_it==0;i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:102:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:120:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:120:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:127:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:145:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:152:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:170:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:170:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size() && n>=words[k].size())
                              ~^~~~~~~~~~~~~~~~~
/in/foo.cc:171:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size() && i_find_it==0;i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:177:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~
/in/foo.cc:195:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(m>=words[k].size())
        ~^~~~~~~~~~~~~~~~~
/in/foo.cc:196:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(i=0;i<=m-words[k].size() && i_find_it==0;i++)
             ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:202:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(o=1;o<words[k].size();o++)
               ~^~~~~~~~~~~~~~~~