Compilare: main.cpp: In function 'int main()': main.cpp:34:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < v.size()-1; i++) ~~^~~~~~~~~~~~ main.cpp:36:21: warning: variable 'vi' set but not used [-Wunused-but-set-variable] float z, y, vi; ^~ main.cpp:52:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < ans.size(); i++) ~~^~~~~~~~~~~~