Compilare: user.cpp: In function ‘void Read()’: user.cpp:12:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jmenoasa.in","r",stdin); ^ user.cpp:13:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("jmenoasa.out","w",stdout); ^ user.cpp:14:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&M); ^ user.cpp:17:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&Matrix[i][j]); ^ user.cpp: In function ‘void getAnswer()’: user.cpp:71:32: warning: ‘c’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n",((l+1)/2)*((c+1)/2)); ^ user.cpp:71:22: warning: ‘l’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n",((l+1)/2)*((c+1)/2)); ^