Compilare: user.cpp: In function ‘int main()’: user.cpp:52:24: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d", &n); ^ user.cpp:55:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in,"%d%d", &x, &y); ^ user.cpp: In function ‘void dfs(int)’: user.cpp:38:41: warning: ‘posp’ may be used uninitialized in this function [-Wmaybe-uninitialized] urm[posp] = urm[pos]; ^