Compilare: user.cpp: In function ‘void solve(std::string&, int, std::vector<int>&)’: user.cpp:16:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < s.size(); i ++) { ^ user.cpp:21:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + cnt - 1 > s.size()) { ^ user.cpp:41:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (i + cnt - 1 > s.size()) { ^ user.cpp:53:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = len + 1; i < s.size(); i ++) { ^