Eroare de compilare: user.cpp: In function ‘void read()’: user.cpp:31: error: ‘exit’ was not declared in this scope user.cpp: In function ‘void solve()’: user.cpp:66: error: ‘exit’ was not declared in this scope user.cpp:96: error: ‘exit’ was not declared in this scope user.cpp:128: error: ‘exit’ was not declared in this scope user.cpp:159: error: ‘exit’ was not declared in this scope user.cpp: In function ‘int verif(int, int, int, int)’: user.cpp:166: warning: unused variable ‘x’ user.cpp:166: warning: unused variable ‘xf’ user.cpp:167: warning: unused variable ‘y’ user.cpp:167: warning: unused variable ‘yf’