Compilare: user.cpp: In function ‘int main()’: user.cpp:49:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < dreapta[i].size(); ++j){ ^ user.cpp:57:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < dreapta[i].size(); ++j){ ^ user.cpp:28:34: 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:29:36: 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:31:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:33:56: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d", &cerc[i].x, &cerc[i].y, &cerc[i].r); ^