Compilare: main.cpp: In function 'int Union(int, int)': main.cpp:10:44: warning: no return statement in function returning non-void [-Wreturn-type] inline int Union(int a, int b){ fth[b] = a;} ^ main.cpp: In function 'int main()': main.cpp:24:24: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d", &n); ^ main.cpp:26:46: warning: ignoring return value of 'int fscanf(FILE*, const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] fscanf(fi,"%d%d", &v[i][0], &v[i][1]); ^