Compilare: user.cpp: In function ‘void CreateMat(int, int)’: user.cpp:13:9: warning: unused variable ‘x’ [-Wunused-variable] int x,y; ^ user.cpp:13:11: warning: unused variable ‘y’ [-Wunused-variable] int x,y; ^ user.cpp: In function ‘void Preparation(int&, int&)’: user.cpp:63:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.in","r",stdin); ^ user.cpp:64:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cmlsc.out","w",stdout); ^ user.cpp:65:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&n1,&n2); ^ user.cpp:67:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d ",&sir1[i]); ^ user.cpp:69:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&sir2[i]); ^