Eroare de compilare: user.cpp: In function ‘list* my_alloc()’: user.cpp:24:39: error: ‘malloc’ was not declared in this scope { return (plist) malloc (sizeof (list)); } ^ user.cpp:24:42: warning: control reaches end of non-void function [-Wreturn-type] { return (plist) malloc (sizeof (list)); } ^ user.cpp: In function ‘void init()’: user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d", &N, &M); ^ user.cpp:51:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (; M--;) { ^ user.cpp:53:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] alloc_edge (nou, dup, out(i), in(j)); ^ user.cpp: In function ‘void solve()’: user.cpp:122:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] printf ("%d\n", flow); ^