题目：
http://acm.zju.edu.cn/onlinejudge/showRuns.do?contestId=1
1 #include<cstdio> 2 #include<cstdlib> 3 #include<cstring> 4 #include<vector> 5 #include<queue> 6 using namespace std; 7 8 const int maxn = 256 + 110; 9 10 struct Node{ 11 bool have_value; 12 int v; 13 Node* left, *right; 14 Node():have_value(false), left(NULL), right(NULL){} 15 }; 16 17 Node* root; 18 19 Node* newnode() 20 { 21 return new Node(); 22 } 23 24 bool failed; 25 void addnode(int v, char* s) 26 { 27 int n = strlen(s); 28 Node* u = root; 29 for(int i=0; i<n; i++) 30 if(s[i]=='L') 31 { 32 if(u->left==NULL) u->left = newnode(); 33 u=u->left; 34 } 35 else if (s[i]=='R') 36 { 37 if(u->right==NULL) u->right = newnode(); 38 u= u->right; 39 } 40 if(u->have_value) failed = true; 41 u->v=v; 42 u->have_value = true; 43 } 44 45 void remove_tree(Node* u) 46 { 47 if(u==NULL) return; 48 remove_tree(u->left); 49 remove_tree(u->right); 50 delete u; 51 } 52 53 char s[maxn]; 54 bool read_input(){ 55 failed = false; 56 remove_tree(root); 57 root = newnode(); 58 for(;;) 59 { 60 if(scanf("%s", s)!=1) return false; 61 if(!strcmp(s, "()")) break; 62 int v; 63 sscanf(&s[1], "%d", &v); 64 addnode(v, strchr(s, ',')+1); 65 } 66 return true; 67 } 68 69 bool bfs(vector<int>& ans) 70 { 71 queue<Node*> q; 72 ans.clear(); 73 q.push(root); 74 while(!q.empty()) 75 { 76 Node* u = q.front(); q.pop(); 77 if(!u->have_value) return false; 78 ans.push_back(u->v); 79 if(u->left!=NULL) q.push(u->left); 80 if(u->right!=NULL) q.push(u->right); 81 } 82 return true; 83 } 84 85 int main() 86 { 87 vector<int> ans; 88 while(read_input()) 89 { 90 if(!bfs(ans)) failed = 1; 91 if(failed) printf("not complete "); 92 else 93 { 94 for(int i=0; i<ans.size(); i++) 95 { 96 if(i!=0) printf(" "); 97 printf("%d", ans[i]); 98 } 99 printf(" "); 100 } 101 } 102 return 0; 103 }