Compilare: user.cpp: In function ‘double solve()’: user.cpp:124:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < norm_x.size(); i++) ^ user.cpp:130:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < norm_y.size(); i++) ^ user.cpp:136:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < norm_z.size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:217:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zuzu.in","r",stdin); ^ user.cpp:218:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zuzu.out","w",stdout); ^ user.cpp:220:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &n, &t); ^ user.cpp: In member function ‘void Cloud::read()’: user.cpp:35:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &aux); ^ user.cpp:37:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &aux); ^ user.cpp:39:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &aux); ^ user.cpp:42:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &aux); ^ user.cpp:44:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &aux); ^ user.cpp:46:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf", &aux); ^ user.cpp:54:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &dir); ^