Compilare: user.cpp: In function ‘void Read2()’: user.cpp:38:9: warning: unused variable ‘a’ [-Wunused-variable] int a,b,c; ^ user.cpp:38:11: warning: unused variable ‘b’ [-Wunused-variable] int a,b,c; ^ user.cpp:38:13: warning: unused variable ‘c’ [-Wunused-variable] int a,b,c; ^ user.cpp:39:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:42:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Adj[i][j]); ^ user.cpp: In function ‘int main()’: user.cpp:51:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.in","r",stdin); ^ user.cpp:52:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out","w",stdout); ^