Compilare: user.cpp: In function ‘std::pair<int, int> getNumber(int, int, int)’: user.cpp:33:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(0 <= c && c <= 9 && i < formula[x][y].size()) ^ user.cpp: In function ‘int rezolvaCel(int, int)’: user.cpp:51:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < formula[x][y].size()) ^ user.cpp:56:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i < formula[x][y].size()) ^ user.cpp:48:9: warning: unused variable ‘c’ [-Wunused-variable] int c, current; ^