Compilare: main.cpp: In function 'int Union(int, int)': main.cpp:34:52: warning: no return statement in function returning non-void [-Wreturn-type] int Union(int a, int b){fth[b] = a, fr[a] += fr[b];} ^ main.cpp: In function 'int main()': main.cpp:42:36: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d", &c, &n, &k); ^ main.cpp:44:123: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d%d%d%d%d", &v[i].A.x, &v[i].A.y, &v[i].B.x, &v[i].B.y, &v[i].C.x, &v[i].C.y), fth[i] = i, fr[i] = 1; ^