Compilare: main.cpp: In function 'void Union(int, int)': main.cpp:18:7: warning: unused variable 'm1' [-Wunused-variable] int m1=find(x); ^~ main.cpp:19:7: warning: unused variable 'm2' [-Wunused-variable] int m2=find(y); ^~ main.cpp: In function 'int main()': main.cpp:28:29: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d",&n,&m); ^ main.cpp:32:38: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d%d%d",&tip,&x,&y); ^