Compilare: user.cpp:3:16: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define NMax (1<<20 + 2) ^ user.cpp:10:16: note: in expansion of macro ‘NMax’ unsigned int a[NMax]; ^ user.cpp: In function ‘int Count(int)’: user.cpp:17:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; ++i){ ^ user.cpp:19:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(H.size() > l){ ^ user.cpp: In function ‘int main()’: user.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; i <= n; ++i) ^