Compilare: user.cpp: In function ‘int main()’: user.cpp:10:27: warning: statement is a reference, not call, to function ‘std::ios_base::sync_with_stdio’ [-Waddress] ios_base::sync_with_stdio; ^ user.cpp:10:27: warning: statement has no effect [-Wunused-value] user.cpp:15:45: warning: iteration 1000001u invokes undefined behavior [-Waggressive-loop-optimizations] for(int i = 0; i<=1000010 ;i++) A[i] = A[i-1] + b[i]; ^ user.cpp:15:1: note: containing loop for(int i = 0; i<=1000010 ;i++) A[i] = A[i-1] + b[i]; ^