Compilare: user.cpp: In function ‘int main()’: user.cpp:73:15: warning: unused variable ‘i’ [-Wunused-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:73:17: warning: unused variable ‘j’ [-Wunused-variable] int n,m,k,i,j,q,x1,y1,x2,y2,val; ^ user.cpp:75:15: warning: unused variable ‘u2’ [-Wunused-variable] update u1,u2; ^ user.cpp:71:43: 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:72:45: 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:77:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(si,sizeof(char),sizeof(si),stdin); ^