Compilare: main.cpp: In function 'int find(ll)': main.cpp:15:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(i < a[m].size() && a[m][i] != h) ~~^~~~~~~~~~~~~ main.cpp: In function 'void push(ll)': main.cpp:22:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(find(h) == a[h % mod].size()) ~~~~~~~~^~~~~~~~~~~~~~~~~~~~ main.cpp:21:6: warning: unused variable 'm' [-Wunused-variable] int m = h % mod; ^ main.cpp: In function 'void pop(ll)': main.cpp:28:8: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(it != a[m].size()) ~~~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:46:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] cout << (find(h) != a[h % mod].size()) << '\n'; ~~~~~~~~^~~~~~~~~~~~~~~~~~~~