Compilare: user.cpp: In function ‘int main()’: user.cpp:136:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] fordef(i,u+1,u+neigh.size()){ ^ user.cpp:12:37: note: in definition of macro ‘fordef’ #define fordef(it,a,b) for(it=a;it<=b;it++) ^ user.cpp:109:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac2.in","r",stdin); ^ user.cpp:110:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("atac2.out","w",stdout); ^ user.cpp:112:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d %d",&n,&m,&u,&prov); ^ user.cpp:113:42: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fordef(i,1,u) scanf("%d",&Fighter[i]); ^ user.cpp:116:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&x,&y); ^