Compilare: user.cpp: In function ‘int defeu(int)’: user.cpp:44:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘void sift(long long unsigned int*, long long unsigned int)’: user.cpp:52:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((2*j<=nr ) && (h[2*j] < h[k])) ^ user.cpp:54:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((2*j<nr) && (h[2*j+1]< h[k])) ^ user.cpp: In function ‘int main()’: user.cpp:98:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1;i<=n;++i) ^ user.cpp:116:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n+1;i<2*n;++i) ^ user.cpp:133:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=n+1;i<2*n;++i) ^ user.cpp:139:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;++i) ^