Compilare: main.cpp: In function 'int main()': main.cpp:54:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:66:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:68:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:93:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) ~~^~~ main.cpp:95:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t j = 0; j < n; j++) ~~^~~ main.cpp:118:58: warning: 'cultura' may be used uninitialized in this function [-Wmaybe-uninitialized] o << linie << " " << coloana << "\n" << (char)(cultura + 'a'); ~~~~~~~~~^~~~~~ main.cpp:118:63: warning: 'coloana' may be used uninitialized in this function [-Wmaybe-uninitialized] o << linie << " " << coloana << "\n" << (char)(cultura + 'a'); ^ main.cpp:118:17: warning: 'linie' may be used uninitialized in this function [-Wmaybe-uninitialized] o << linie << " " << coloana << "\n" << (char)(cultura + 'a'); ^~~