Compilare: user.cpp: In function ‘void dfs(int)’: user.cpp:25:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<v[nod].size(); ++i) ^ user.cpp: In function ‘int main()’: user.cpp:38:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.in", "r", stdin); ^ user.cpp:39:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("domino.out", "w", stdout); ^ user.cpp:43:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &m); ^ user.cpp:46:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d", &x, &y); ^ user.cpp:93:21: warning: ‘p2’ may be used uninitialized in this function [-Wmaybe-uninitialized] to[m+1] = p2; ^ user.cpp:95:21: warning: ‘p1’ may be used uninitialized in this function [-Wmaybe-uninitialized] st[++k] = p1; ^