Compilare: user.cpp: In function ‘int main()’: user.cpp:7:40: warning: unused variable ‘f’ [-Wunused-variable] int n,dx,dy,maxx,maxy,minx,miny,i,a,b,f,st,dr,min,j,s,t,min1,in,sf,e,dr1; ^ user.cpp:7:52: warning: unused variable ‘j’ [-Wunused-variable] int n,dx,dy,maxx,maxy,minx,miny,i,a,b,f,st,dr,min,j,s,t,min1,in,sf,e,dr1; ^ user.cpp:8:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tribute.in","r",stdin); ^ user.cpp:9:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("tribute.out","w",stdout); ^ user.cpp:10:28: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&n,&dx,&dy); ^ user.cpp:17:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&a,&b); ^