Compilare: user.cpp: In function ‘int main()’: user.cpp:27:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] si[1][n+1]=NULL; ^ user.cpp:28:23: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] si[2][n+1]=NULL; ^ user.cpp:8:15: warning: unused variable ‘j’ [-Wunused-variable] int q,t,i,j,n,mx,lx,ly; ^ user.cpp:8:19: warning: variable ‘mx’ set but not used [-Wunused-but-set-variable] int q,t,i,j,n,mx,lx,ly; ^ user.cpp:8:22: warning: unused variable ‘lx’ [-Wunused-variable] int q,t,i,j,n,mx,lx,ly; ^ user.cpp:8:25: warning: unused variable ‘ly’ [-Wunused-variable] int q,t,i,j,n,mx,lx,ly; ^ 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); ^