Compilare: user.cpp: In function ‘int main()’: user.cpp:5:30: warning: unused variable ‘j’ [-Wunused-variable] int l,c,d,n,i,k,pp,l1,c1,j; ^ user.cpp:6:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.in","r",stdin); ^ user.cpp:7:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zona.out","w",stdout); ^ user.cpp:8:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&l,&c,&d,&n); ^ user.cpp:11:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^ user.cpp:64:35: warning: ‘c1’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d\n",a[l][c]-a[l1][c1]+1); ^ user.cpp:64:35: warning: ‘l1’ may be used uninitialized in this function [-Wmaybe-uninitialized]