Compilare: user.cpp: In function ‘int main()’: user.cpp:68:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (q->urm[sir[j]] == 0) q->urm[sir[j]] = new nod; ^ user.cpp:68:51: warning: array subscript has type ‘char’ [-Wchar-subscripts] if (q->urm[sir[j]] == 0) q->urm[sir[j]] = new nod; ^ user.cpp:69:30: warning: array subscript has type ‘char’ [-Wchar-subscripts] q = q->urm[sir[j]]; ^ user.cpp:49:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("adn2.in", "r", stdin); ^ user.cpp:50:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("adn2.out", "w", stdout); ^ user.cpp:53:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &T); ^ user.cpp:57:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d %d\n", &N, &M); ^ user.cpp:62:23: warning: ignoring return value of ‘char* gets(char*)’, declared with attribute warn_unused_result [-Wunused-result] gets (sir + 1); ^ /tmp/ccoDK44L.o: In function `main': user.cpp:(.text.startup+0xec): warning: the `gets' function is dangerous and should not be used.