Compilare: user.cpp: In function ‘void precalcD()’: user.cpp:64:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < V.size(); i++) ^ user.cpp:66:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 1; (1 << i) <= V.size(); i++) ^ user.cpp:68:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j = 0; j < V.size(); j++) ^ user.cpp: In function ‘void Solve()’: user.cpp:173:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < Sol.size(); i++) ^ user.cpp:136:9: warning: unused variable ‘res’ [-Wunused-variable] int res = Sum(0, V.size() - 1); ^