Compilare: user.cpp: In function ‘int main()’: user.cpp:115:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < norm_x.size(); i++) ^ user.cpp:121:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < norm_y.size(); i++) ^ user.cpp:97:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mm.in","r",stdin); ^ user.cpp:98:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mm.out","w",stdout); ^ user.cpp:100:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &dim, &L, &n); ^ user.cpp: In member function ‘void Drept::read()’: user.cpp:23:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d", &x1, &y1, &x2, &y2, &cost); ^