uva-122 樹的層次遍歷

uva 122
白書代碼

#include <cstdio>
#include <cstring>
#include <vector>
#include <queue>
using namespace std;
const int maxn=300;
char s[maxn];
bool failed;
struct node
{
    bool have_value;
    int v;
    node *left,*right;
    node():have_value(false),left(NULL),right(NULL){}
};
node* root;
node* newnode(){return new node();}
void addnode(int v,char* s){
    int n=strlen(s);
    node* u=root;
    for (int i = 0; i < n; i++)
    {
        if(s[i]=='L'){
            if(u->left==NULL)u->left=newnode();
            u=u->left;
        }
        else if(s[i]=='R'){
            if(u->right==NULL) u->right=newnode();
            u=u->right;
        }
    }
    if(u->have_value) failed=true;
    u->v=v;
    u->have_value=true;
}
bool bfs(vector<int>& ans){
    queue<node*>q;
    ans.clear();
    q.push(root);
    while(!q.empty()){
        node* u=q.front();q.pop();
        if(!u->have_value)return false;
        ans.push_back(u->v);
        if(u->left!=NULL)q.push(u->left);
        if(u->right!=NULL)q.push(u->right);
    }
    return true;
}
bool read_input(){
    failed=false;
    root=newnode();
    for(;;){
        if(scanf("%s",s)!=1)return false;
        if(!strcmp(s,"()")) break;
        int v;
        sscanf(&s[1],"%d",&v);
        addnode(v,strchr(s,',')+1);
    }
    return true;
}

int main() {
    vector<int> v;
    while(read_input()){
        bool flag=bfs(v);
        int size=v.size();
        if(!flag||failed)printf("not complete\n");
        else for(int i=0;i<size;i++)printf(i==size-1?"%d\n":"%d ",v[i]);
    }

    return 0;
}