Compilare: user.cpp: In function ‘void Read()’: user.cpp:48:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(j < strlen(s)){ ^ user.cpp: In function ‘bool Check2(int, int)’: user.cpp:26:57: warning: ‘sol’ may be used uninitialized in this function [-Wmaybe-uninitialized] if((sol1 == Mat[i][j] or sol2 == Mat[i][j]) and Mat[i][j] != sol){ ^