Compilare: user.cpp: In function ‘int main()’: user.cpp:56:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < dreapta[i].size(); ++j){ ^ user.cpp:64:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < dreapta[i].size(); ++j){ ^ user.cpp:29:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.in", "r", stdin); ^ user.cpp:30:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc3.out", "w", stdout); ^ user.cpp:32:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:34:59: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf%lf", &cerc[i].x, &cerc[i].y, &cerc[i].r); ^