1053 Path of Equal Weight (30 分)(树的遍历)

题目大意:给出树的结构和权值,找从根结点到叶子结点的路径上的权值相加之和等于给定目标数的路径,并且从大到小输出路径

#include<bits/stdc++.h>

using namespace std;
int n,m,sum;
const int N=120;
struct node
{
    int w;
    vector<int>p;
}tree[N];
bool cmp(int a,int b)
{
    return tree[a].w>tree[b].w;
}
vector<int>path;
void dfs(int s,int v)
{
    //cout<<s<<"  "<<v<<endl;
    if(s>sum) return;
    if(s==sum){
        if(tree[v].p.size()!=0) return;
        path.push_back(v);
        for(int i=0;i<path.size();i++){
            if(i) printf(" ");
            printf("%d",tree[path[i]].w);
        }
        printf("\n");
        path.pop_back();
    }
    path.push_back(v);
    for(int i=0;i<tree[v].p.size();i++){
        dfs(s+tree[tree[v].p[i]].w,tree[v].p[i]);
    }
    path.pop_back();
}
int main()
{
    scanf("%d %d %d",&n,&m,&sum);
    for(int i=0;i<n;i++) scanf("%d",&tree[i].w);
    for(int i=0;i<m;i++){
        int id;
        int k;
        scanf("%d %d",&id,&k);
        for(int j=0;j<k;j++){
            int x;
            scanf("%d",&x);
            tree[id].p.push_back(x);
        }
        sort(tree[id].p.begin(),tree[id].p.end(),cmp);
    }
    dfs(tree[0].w,0);
    return 0;
}

原文地址:https://www.cnblogs.com/chenchen-12/p/10226074.html

时间: 2024-08-30 13:57:57

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