Compilare: user.cpp: In function ‘int main()’: user.cpp:12:11: warning: unused variable ‘m’ [-Wunused-variable] int n,m,i,j,x,y,hs,md=1000007; ^ user.cpp:12:15: warning: unused variable ‘j’ [-Wunused-variable] int n,m,i,j,x,y,hs,md=1000007; ^ user.cpp:14:8: warning: unused variable ‘tp’ [-Wunused-variable] sp tp; ^ user.cpp:10:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pal2.in","r",stdin); ^ user.cpp:11:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("pal2.out","w",stdout); ^ user.cpp:15:14: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets(s+1); ^ /tmp/ccn6Frnn.o: In function `main': user.cpp:(.text.startup+0x56): warning: the `gets' function is dangerous and should not be used.