Compilare: user.cpp: In function ‘int main()’: user.cpp:156:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L.size(); ++ i) ^ user.cpp:162:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < L.size(); ++ i) ^ user.cpp:167:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < L.size(); ++ i) ^ user.cpp:139:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:143:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &x, &y); ^