Compilare: user.cpp:8:15: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses] #define NMAX 1<<20 + 1 ^ user.cpp:10:25: note: in expansion of macro ‘NMAX’ unsigned int n, l, u, v[NMAX]; ^ user.cpp: In function ‘long long int check(int)’: user.cpp:19:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (;i <= n;i++) ^ user.cpp:22:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (h.size() > lim) ^ user.cpp: In function ‘int main()’: user.cpp:37:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1;i <= n;i++) f>>v[i]; ^ user.cpp:35:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j; ^