Compilare: user.cpp: In function ‘int main()’: user.cpp:50:15: warning: unused variable ‘i’ [-Wunused-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:50:17: warning: unused variable ‘j’ [-Wunused-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:48:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.in","r",stdin); ^ user.cpp:49:45: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("dreptunghiuri3.out","w",stdout); ^ user.cpp:52:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&m,&k); ^ user.cpp:55:49: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d",&x1,&y1,&x2,&y2,&val); ^