Compilare: user.cpp: In function ‘int main()’: user.cpp:17:11: warning: unused variable ‘cate’ [-Wunused-variable] int n,i,j,cate=0,lmax,nr1,dr1,st1,mij1,elem1; ^ user.cpp:17:18: warning: unused variable ‘lmax’ [-Wunused-variable] int n,i,j,cate=0,lmax,nr1,dr1,st1,mij1,elem1; ^ user.cpp:14:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("euro2.in","r",stdin); ^ user.cpp:15:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("euro2.out","w",stdout); ^ user.cpp:20:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&n); ^ user.cpp:23:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%f",&v1[i]);} ^ user.cpp:77:30: warning: ‘elem2’ may be used uninitialized in this function [-Wmaybe-uninitialized] poz2[n-i+1]=elem2;}}} ^ user.cpp:48:26: warning: ‘elem1’ may be used uninitialized in this function [-Wmaybe-uninitialized] poz1[i]=elem1;}}} ^