L2-1 链表去重 (25分)
#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<cstring>
#include<string>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;
#define STDIN freopen("in.in", "r", stdin);freopen("out.out", "w", stdout);
const int N = 1e7 + 10;
int head, ne[N],v[N];
int n;
bool st[N];
int main()
{
// STDIN
cin >> head >> n;
memset(ne, -1, sizeof ne);
for (int i = 1; i <= n; i++)
{
int id, val, nid;
cin >> id >> val >> nid;
v[id] = val;
ne[id] = nid;
}
int now = head;
// printf("%05d %d %5d
", head, v[head], ne[head]);
vector<pair<int, int > > vec1;
vector<pair<int, int> > vec2;
vec1.push_back({head, v[head]});
st[abs(v[head])] = true;
while (ne[now] != -1)
{
now = ne[now];
if (!st[abs(v[now])])
vec1.push_back({now, v[now]}), st[abs(v[now])] = true;
else vec2.push_back({now, v[now]});
}
int len = vec1.size();
// cout << vec1.size() << endl;
for (int i = 0; i < len; i++)
{
if (i != len-1)
printf("%05d %d %05d
", vec1[i].first, vec1[i].second, vec1[i+1].first);
else printf("%05d %d %d
", vec1[i].first, vec1[i].second, -1);
}
len = vec2.size();
for(int i = 0; i < len; i++)
{
if (i!= len-1)
printf("%05d %d %05d
", vec2[i].first, vec2[i].second, vec2[i+1].first);
else printf("%05d %d %d
", vec2[i].first, vec2[i].second, -1);
}
}