Compilare: user.cpp:9:29: warning: integer overflow in expression [-Woverflow] const int inf = (2 << 30) - 1; ^ user.cpp: In function ‘void citire()’: user.cpp:19:13: warning: unused variable ‘x’ [-Wunused-variable] int x, y, cost; ^ user.cpp:19:16: warning: unused variable ‘y’ [-Wunused-variable] int x, y, cost; ^ user.cpp:19:19: warning: unused variable ‘cost’ [-Wunused-variable] int x, y, cost; ^