Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:28:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < Nxt[id].size(); ++ i) ^ user.cpp: In function ‘void read()’: user.cpp:23:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d", &n, &q, &k); ^ user.cpp: In function ‘void solve()’: user.cpp:59:33: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &ty, &id); ^ user.cpp:63:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &x, &y); ^ user.cpp:74:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &V[nrq].nr, &V[nrq].val); ^ user.cpp: In function ‘void write()’: user.cpp:86:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &r); ^