Compilare: user.cpp: In function ‘int main()’: user.cpp:20:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] For(i,1,n,1) ^ user.cpp:4:36: note: in definition of macro ‘For’ #define For(i,a,b,r) for(i = a; i<=b; i += r) ^ user.cpp:22:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] For(i,1,n,1) ^ user.cpp:4:36: note: in definition of macro ‘For’ #define For(i,a,b,r) for(i = a; i<=b; i += r) ^ user.cpp:26:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j = i+1; j<= n && v[j] >= v[i]; ++j,++ct); ^ user.cpp:16:26: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(in,"r",stdin); ^ user.cpp:17:28: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(out,"w",stdout); ^ user.cpp:19:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ud",&n); ^ user.cpp:21:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ud",&*v+i); ^