Compilare: user.cpp: In function ‘void introduce()’: user.cpp:21:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(st[i]);++j) ^ user.cpp: In function ‘void afisare()’: user.cpp:90:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=0;j<strlen(sol[i]);++j) ^ user.cpp: In function ‘void rezolva()’: user.cpp:51:21: warning: ‘stare’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(s[i]==')'&&stare==fisier) ^