Compilare: user.cpp: In function ‘int verif(std::string)’: user.cpp:11:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s.size(); ++j) { ^ user.cpp:18:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < s.size(); ++j) { ^ user.cpp:31:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[cur] == 'A' && cur < s.size()) { ^ user.cpp:35:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(cur == s.size()) ^ user.cpp:39:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = cur; i < s.size(); ++i) { ^ user.cpp: In function ‘std::string new_string(std::string, int)’: user.cpp:61:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(cur < s.size()) { ^