Compilare: user.cpp: In function ‘void Read()’: user.cpp:20:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&N); ^ user.cpp:29:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^ user.cpp: In function ‘int main()’: user.cpp:154:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.in","r",stdin); ^ user.cpp:155:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.out","w",stdout); ^ user.cpp: In function ‘void Print()’: user.cpp:146:9: warning: ‘pzbn’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i = (int)ans.size() -1; i > pzbn; --i) ^ user.cpp: In function ‘void euler(int)’: user.cpp:63:9: warning: ‘v’ may be used uninitialized in this function [-Wmaybe-uninitialized] int v; ^ user.cpp: In function ‘void Check()’: user.cpp:127:14: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized] euler(st); ^