Compilare: main.cpp: In function 'int main()': main.cpp:107:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 107 | for(int i=0; i<s.size(); i++) { | ~^~~~~~~~~ main.cpp:108:32: warning: array subscript has type 'char' [-Wchar-subscripts] 108 | Treap::insert(i+1,hash[s[i]]); | ^ main.cpp:115:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 115 | for(int j=0; j<s.size(); j++) { | ~^~~~~~~~~ main.cpp:116:38: warning: array subscript has type 'char' [-Wchar-subscripts] 116 | cuv[i]=(1001LL*cuv[i]+hash[s[j]])%mod; | ^ main.cpp:131:32: warning: array subscript has type 'char' [-Wchar-subscripts] 131 | Treap::insert(ind-1,hash[ch]); | ^~