Compilare: user.cpp: In function ‘int main()’: user.cpp:16:9: warning: unused variable ‘nod’ [-Wunused-variable] int nod=1; ^ 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("cablaj.in","r",stdin); ^ user.cpp:12:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cablaj.out","w",stdout); ^ user.cpp:14:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:15:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d%d",&vx[i],&vy[i]); ^ user.cpp:29:78: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] int c=(vx[nod]-vx[j])*(vx[nod]-vx[j])+(vy[nod]-vy[j])*(vy[nod]-vy[j]); ^