Compilare: user.cpp: In function ‘int main()’: user.cpp:15:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.in","r",stdin); ^ user.cpp:16:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("barbar.out","w",stdout); ^ user.cpp:21:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld\n",&n,&m); ^ user.cpp:25:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^ user.cpp:31:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("\n"); ^ user.cpp:49:23: warning: ‘yo’ may be used uninitialized in this function [-Wmaybe-uninitialized] a[xo][yo]=d[xo][yo]; ^ user.cpp:49:23: warning: ‘xo’ may be used uninitialized in this function [-Wmaybe-uninitialized] user.cpp:63:27: warning: ‘yd’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%lld",a[xd][yd]-1); ^ user.cpp:63:27: warning: ‘xd’ may be used uninitialized in this function [-Wmaybe-uninitialized]