/in/foo.cc: In function 'int main()':
/in/foo.cc:29:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(j<strlen(b1[i]))
         ~^~~~~~~~~~~~~~
/in/foo.cc:46:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(k=0;k<strlen(b1[a[j]])&&k<strlen(b1[a[j+1]]);k++)
            ~^~~~~~~~~~~~~~~~~
/in/foo.cc:46:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(k=0;k<strlen(b1[a[j]])&&k<strlen(b1[a[j+1]]);k++)
                                ~^~~~~~~~~~~~~~~~~~~
/in/foo.cc:55:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(k==strlen(b1[a[j]])-1&&k>=strlen(b1[a[j+1]])&&p==1)
        ~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc:55:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(k==strlen(b1[a[j]])-1&&k>=strlen(b1[a[j+1]])&&p==1)
                               ~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'int s(char)':
/in/foo.cc:77:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^