Compilare: user.cpp: In function ‘void df(int)’: user.cpp:45:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<tree[x].C.size();i++) ^ user.cpp: In function ‘void compute_nod_where(int)’: user.cpp:79:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<tree[x].C.size();i++) ^ user.cpp:85:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<tree[x].msgr.size();j++){ ^ user.cpp:87:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (k=0;k<tree[tree[x].tat].msgr.size();k++) ^ user.cpp:92:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (k==tree[tree[x].tat].msgr.size()) ^ user.cpp: In function ‘int code(int, int)’: user.cpp:129:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<tree[nod].msgr.size();i++) ^ user.cpp: In function ‘void solve(int)’: user.cpp:139:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<tree[x].C.size();i++) ^ user.cpp:152:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<tree[x].msgr.size();j++) ^ user.cpp:165:14: warning: zero-length gnu_printf format string [-Wformat-zero-length] printf (""); ^ user.cpp:166:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<tree[x].msgr.size();j++)if ((i>>j)%2){ ^ user.cpp:175:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<tree[x].C.size();j++)if (tree[x].C[j]!=tree[x].tat){ ^ user.cpp:179:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int k=0;k<tree[fiu].where.size();k++) ^ user.cpp: In function ‘void read_data()’: user.cpp:98:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:101:23: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&a,&b); ^ user.cpp:108:17: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&m); ^