Compilare: user.cpp: In function ‘int main()’: user.cpp:34:40: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i <= msj.length() - 4; ++ i) { ^ user.cpp:57:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i < sol.size(); ++ i) ^ user.cpp:21:17: warning: unused variable ‘j’ [-Wunused-variable] int txt, i, j, p, fmax, len; ^ user.cpp:21:20: warning: unused variable ‘p’ [-Wunused-variable] int txt, i, j, p, fmax, len; ^ user.cpp:21:29: warning: unused variable ‘len’ [-Wunused-variable] int txt, i, j, p, fmax, len; ^ user.cpp:19:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pentagrame.in", "r", stdin); ^ user.cpp:20:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pentagrame.out", "w", stdout); ^