Compilare: user.cpp: In function ‘int main()’: user.cpp:27:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < line.size(); ++i) { ^ user.cpp:46:53: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < codesize - 1 && i < text.size(); ++i) { ^ user.cpp:50:60: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = codesize - 1; i < codesize && i < text.size(); ++i) { ^ user.cpp:58:47: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = codesize, j = 0; i < text.size(); ++i, ++j) { ^ user.cpp:57:7: warning: unused variable ‘j’ [-Wunused-variable] int j; ^