Compilare: user.cpp: In function ‘void read()’: user.cpp:4:22: warning: integer overflow in expression [-Woverflow] #define Inf ((2<<30)-1) ^ user.cpp:17:25: note: in expansion of macro ‘Inf’ M[i][j]=Inf; ^ user.cpp: In function ‘int main()’: user.cpp:4:22: warning: integer overflow in expression [-Woverflow] #define Inf ((2<<30)-1) ^ user.cpp:36:25: note: in expansion of macro ‘Inf’ if(M[i][j]!=Inf) ^ user.cpp: In function ‘void read()’: user.cpp:11:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &N); ^ user.cpp:15:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &M[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:23:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.in","rt",stdin); ^ user.cpp:24:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out","wt",stdout); ^