Compilare: user.cpp: In function ‘int main(int, const char**)’: user.cpp:100:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < polygon.size(); ++i) ^ user.cpp:41:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%d", &N); ^ user.cpp:45:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lf", &p1); ^ user.cpp:46:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(f, "%lf", &p2); ^