Compilare: user.cpp: In function ‘int main()’: user.cpp:51:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] si[i][ly+1]=NULL; ^ user.cpp:6:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nop.in","r",stdin); ^ user.cpp:7:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nop.out","w",stdout); ^ user.cpp:10:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&t); ^ user.cpp:14:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:8:25: warning: ‘ly’ may be used uninitialized in this function [-Wmaybe-uninitialized] int q,t,i,j,n,mx,lx,ly; ^ user.cpp:49:9: warning: ‘lx’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=1;i<=lx;i++) ^