Compilare: user.cpp: In function ‘int main()’: user.cpp:22:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &n, &m, &r, &e); ^ user.cpp:27:68: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d", &v[i].x, &v[i].y, &v[i].a, &v[i].b); ^