Compilare: user.cpp: In function ‘int main()’: user.cpp:72:17: warning: unused variable ‘j’ [-Wunused-variable] int n,m,k,i,j,x,y,z,up,lx,ly; ^ user.cpp:72:25: warning: unused variable ‘up’ [-Wunused-variable] int n,m,k,i,j,x,y,z,up,lx,ly; ^ user.cpp:72:28: warning: unused variable ‘lx’ [-Wunused-variable] int n,m,k,i,j,x,y,z,up,lx,ly; ^ user.cpp:72:31: warning: unused variable ‘ly’ [-Wunused-variable] int n,m,k,i,j,x,y,z,up,lx,ly; ^ user.cpp:70:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.in","r",stdin); ^ user.cpp:71:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("arb4.out","w",stdout); ^ user.cpp:73:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:76:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&x,&y,&z); ^ user.cpp:88:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&mu[m].x,&mu[m].y,&mu[m].co); ^