Compilare: user.cpp: In function ‘bool Insert(std::shared_ptr<Tree>&)’: user.cpp:42:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k < stringToFind.length()) ~~^~~~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘void Solution(std::shared_ptr<Tree>)’: user.cpp:52:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < nod->pattern.size(); j++) ~~^~~~~~~~~~~~~~~~~~~~~ user.cpp: In function ‘int main()’: user.cpp:100:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < cChild->fail->pattern.size(); j++) ~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ user.cpp:106:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k = 0; k < s.length(); k++) ~~^~~~~~~~~~~~