Compilare: user.cpp: In function ‘void P1()’: user.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(S[i].size() > Max || ( S[i].size() == Max && S[i] < t ) ) ^ user.cpp:24:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(S[i].size() > Max || ( S[i].size() == Max && S[i] < t ) ) ^ user.cpp: In function ‘bool check(std::string, std::string)’: user.cpp:37:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0, j = 0; i < s.size() && j < t.size() ; i++) ^ user.cpp:37:50: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0, j = 0; i < s.size() && j < t.size() ; i++) ^ user.cpp:39:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] return j == t.size(); ^