Compilare: main.cpp: In function 'void manacher(std::vector<std::__cxx11::basic_string<char> >&, std::vector<int>&)': main.cpp:11:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<x.size(); i++) ~^~~~~~~~~ main.cpp:16:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<s.size(); i++){ ~^~~~~~~~~ main.cpp:20:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i-k >= 0 and i+k < s.size() and s[i-k] == s[i+k]) ~~~~^~~~~~~~~~ main.cpp: In function 'long long int dp(std::vector<int>&)': main.cpp:39:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2; i<lps.size(); i+=2) ~^~~~~~~~~~~ main.cpp:47:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<lps.size(); i++){ ~^~~~~~~~~~~