Compilare: user.cpp: In function ‘void solvesecond()’: user.cpp:43:26: warning: operation on ‘p’ may be undefined [-Wsequence-point] for (int p=1;n;p=p<<=1) { ^ user.cpp: In function ‘int main()’: user.cpp:70:9: warning: unused variable ‘i’ [-Wunused-variable] int i,j; ^ user.cpp:70:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j; ^