Compilare: main.cpp:7:25: warning: suggest parentheses around '+' inside '<<' [-Wparentheses] unsigned int v [1 << 20 + 3]; ~~~^~~ main.cpp: In function 'long long int Solve(int)': main.cpp:13:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= N; i ++){ ~~^~~~ main.cpp:15:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (mp.size() > k){ ~~~~~~~~~~^~~ main.cpp: In function 'int main()': main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i <= N; i ++) ~~^~~~