Compilare: user.cpp: In function ‘void insert(int)’: user.cpp:18:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos; i < str.size(); ++ i) { ^ user.cpp: In function ‘void insertIf(int, int)’: user.cpp:28:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos; i < str.size(); ++ i) { ^ user.cpp: In function ‘void insertDeny(int)’: user.cpp:41:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = pos; i < str.size(); ++ i) { ^ user.cpp: In function ‘int main()’: user.cpp:59:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < str.size(); ++ i) ^ user.cpp:64:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < str.size(); ++ j) ^ user.cpp:72:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < str.size(); ++ j) ^