Compilare: user.cpp: In function ‘int main()’: user.cpp:13:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diff.in","r",stdin); ^ user.cpp:14:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("diff.out","w",stdout); ^ user.cpp:16:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:19:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:46:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&k); ^ user.cpp:33:5: warning: ‘poz12’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=poz12;i>=poz11;i--) ^ user.cpp:39:5: warning: ‘poz22’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(int i=poz22;i>=poz21;i--) ^ user.cpp:15:44: warning: ‘poz21’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,maxx=-1e9,minn=1e9,poz11,poz12,poz21,poz22,k; ^ user.cpp:15:32: warning: ‘poz11’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,maxx=-1e9,minn=1e9,poz11,poz12,poz21,poz22,k; ^