Compilare: user.cpp: In function 'int cmp(std::pair<std::pair<int, int>, int>, std::pair<std::pair<int, int>, int>)': user.cpp:21: warning: second operand of conditional has no effect user.cpp:21: warning: third operand of conditional has no effect user.cpp:22: warning: no return statement in function returning non-void user.cpp: In function 'void solve()': user.cpp:46: warning: unused variable 'i' user.cpp:46: warning: unused variable 'j' user.cpp: In function 'int cmp(std::pair<std::pair<int, int>, int>, std::pair<std::pair<int, int>, int>)': user.cpp:22: warning: control reaches end of non-void function /tmp/ccJwfE7h.o: In function `main': user.cpp:(.text+0x2b9): warning: the `gets' function is dangerous and should not be used.