Compilare: user.cpp: In function ‘i64 pfact(int, int)’: user.cpp:10:13: warning: statement has no effect [-Wunused-value] fact[a] / fact[a - b]; ~~~~~~~~^~~~~~~~~~~~~ user.cpp:11:1: warning: no return statement in function returning non-void [-Wreturn-type] } ^ user.cpp: In function ‘bool check(i64)’: user.cpp:59:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < down.size() - 1; i++) { ~~^~~~~~~~~~~~~~~~~ user.cpp:61:13: warning: unused variable ‘q’ [-Wunused-variable] int q = down[i]; ^ user.cpp:58:9: warning: unused variable ‘nr’ [-Wunused-variable] i64 nr = 0; ^~ user.cpp: In function ‘int main()’: user.cpp:101:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < down.size(); i++) ~~^~~~~~~~~~~~~