Compilare: user.cpp: In function ‘int main()’: user.cpp:52:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (scanf("%d", &T); T; --T) { ^ user.cpp:53:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &N, &M, &K); ^ user.cpp:58:38: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &U[i][j]); ^ user.cpp:38:33: warning: ‘pos’ may be used uninitialized in this function [-Wmaybe-uninitialized] while (node != disjoint[node]) { ^ user.cpp:96:17: note: ‘pos’ was declared here int pos; ^