Compilare: user.cpp: In function ‘int main()’: user.cpp:59:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] int n, m; fscanf(in,"%d%d", &n, &m); ^ user.cpp:61:34: 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()’: user.cpp:40:45: warning: ‘posp’ may be used uninitialized in this function [-Wmaybe-uninitialized] urm[posp] = urm[pos]; ^