Compilare: user.cpp: In function ‘int main()’: user.cpp:4:11: warning: ‘first’ may be used uninitialized in this function [-Wmaybe-uninitialized] #define x first ^ user.cpp:4:11: note: ‘first’ was declared here #define x first ^ user.cpp:19:18: note: in expansion of macro ‘x’ int n, i, j, x, nr=0, sol=0, solnr=0; ^