Compilare: user.cpp: In function ‘int main()’: user.cpp:48:9: warning: unused variable ‘M’ [-Wunused-variable] int M, x, y, Start; ^ user.cpp:50:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f, "%d", &N ); ^ user.cpp:53:37: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf ( f, "%d%d", &x, &y ); ^ user.cpp: In function ‘int BFS(int)’: user.cpp:43:12: warning: ‘nod’ may be used uninitialized in this function [-Wmaybe-uninitialized] return nod; ^