/in/foo.cc: In function 'int main()':
/in/foo.cc:11:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int i=0;i<=strlen(ch)-1;i++)
              ~^~~~~~~~~~~~~~
/in/foo.cc:20:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(i!=strlen(ch)-1)cz[++topz]='(';
       ~^~~~~~~~~~~~~~
/in/foo.cc:21:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<strlen(ch1[s-1]);j++)
                ~^~~~~~~~~~~~~~~~~
/in/foo.cc:26:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<strlen(ch1[s]);j++)
                ~^~~~~~~~~~~~~~~
/in/foo.cc:30:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(i!=strlen(ch)-1)cz[++topz]=')';
       ~^~~~~~~~~~~~~~