Compilare: main.cpp:6:26: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] const int NMAX = 1 << 20 + 3; ~~~^~~ main.cpp: In function 'long long int Solve(int)': main.cpp:14:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= N; i ++){ ~~^~~~ main.cpp:16:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (mp.size() > k){ ~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= N; i ++) ~~^~~~