Compilare: user.cpp: In function ‘int main()’: user.cpp:9:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,x,cc,a,ok=0,y; ^ user.cpp:44:9: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] fv[y]--; ^ user.cpp:46:9: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] fv[a]++; ^ user.cpp:45:9: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] fv[x]++; ^