/in/foo.cc: In function 'void Creat_sa()':
/in/foo.cc:40:9: warning: unused variable 'lcp' [-Wunused-variable]
     int lcp[maxn];
         ^~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:80:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i = 0;i < s.size();i++) {
                 ~~^~~~~~~~~~