Compilare: user.cpp: In function ‘void UnionSet(int, int)’: user.cpp:16:9: warning: unused variable ‘tata1’ [-Wunused-variable] int tata1=FindSet(x),tata2=FindSet(y); ^ user.cpp:16:26: warning: unused variable ‘tata2’ [-Wunused-variable] int tata1=FindSet(x),tata2=FindSet(y); ^ user.cpp: In function ‘int main()’: user.cpp:34:15: warning: unused variable ‘j’ [-Wunused-variable] int m,n,i,j,x,y,z; ^ user.cpp:32:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.in","r",stdin); ^ user.cpp:33:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("disjoint.out","w",stdout); ^ user.cpp:35:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:43:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d",&z,&x,&y); ^