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: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:75:31: warning: ignoring return value of ‘char* fgets(char*, int, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fgets(si,sizeof(si),stdin); ^ user.cpp:84:17: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(si); ^ /tmp/cccxBLlv.o: In function `main': user.cpp:(.text.startup+0xca): warning: the `gets' function is dangerous and should not be used.