Compilare: main.cpp: In function 'void buildLPS(std::vector<int>&, std::__cxx11::string)': main.cpp:10:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.length(); ++i) { ~~^~~~~~~~~~~~ main.cpp:13:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1, j = 0; i < a.length(); ++i) { ~~^~~~~~~~~~~~ main.cpp: In function 'void kmp(std::vector<int>&, std::vector<int>, std::__cxx11::string, std::__cxx11::string)': main.cpp:21:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0, j = 0; i < b.length();) { ~~^~~~~~~~~~~~ main.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(j == a.length()) matches.push_back(i - j), j = lps[j - 1]; ~~^~~~~~~~~~~~~ main.cpp:26:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] else if(i < b.length() && a[j] != b[i]){ ~~^~~~~~~~~~~~