Compilare: user.cpp: In function ‘void solve()’: user.cpp:124:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(unsigned int i=1;i<=cnt;i++) printf("%d ",sol[i]); ^ user.cpp: In function ‘int get()’: user.cpp:24:46: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] while(buff[pos]<'0' || buff[pos]>'9') nxt; ^ user.cpp:28:12: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] nxt; ^ user.cpp: In function ‘int main()’: user.cpp:130:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dans.in","r",stdin); ^ user.cpp:131:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dans.out","w",stdout); ^ user.cpp: In function ‘int check()’: user.cpp:56:15: warning: ‘p’ may be used uninitialized in this function [-Wmaybe-uninitialized] dfs(ind[p]); ^ user.cpp: In function ‘void solve()’: user.cpp:123:27: warning: ‘cnt’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(unsigned int i=cnt+1;i<sol.size();i++) printf("%d ",sol[i]); ^