https://codeforces.com/contest/1106/problem/D

C++版本一

題解：

每次都走曾經和現在可以選擇的最小節點

/* *@Author: STZG *@Language: C++ */ #include <bits/stdc++.h> #include<iostream> #include<algorithm> #include<cstdlib> #include<cstring> #include<cstdio> #include<string> #include<vector> #include<bitset> #include<queue> #include<deque> #include<stack> #include<cmath> #include<list> #include<map> #include<set> //#define DEBUG #define RI register int using namespace std; typedef long long ll; //typedef __int128 lll; const int N=100000+10; const int MOD=1e9+7; const double PI = acos(-1.0); const double EXP = 1E-8; const int INF = 0x3f3f3f3f; int t,n,m,k,q; int cnt,flag,temp; vector<int>v[N]; vector<int>ans; int vis[N]; priority_queue<int,vector<int>,greater<int> >Q; void dfs(int x){//cout<<x<<endl;ans.push_back(x);for(int i=0,j=v[x].size();i<j;i++){if(vis[v[x][i]]==0){Q.push(v[x][i]);//vis[v[x][i]]=0;}}if(Q.empty())return;int d=Q.top();Q.pop();while(vis[d]&&!Q.empty()){d=Q.top();Q.pop();}if(vis[d])return;vis[d]=1;dfs(d); } int main() { #ifdef DEBUGfreopen("input.in", "r", stdin);//freopen("output.out", "w", stdout); #endifscanf("%d%d",&n,&m);while(m--){int a,b;scanf("%d %d",&a,&b);v[a].push_back(b);v[b].push_back(a);}for(int i=1;i<=n;i++)sort(v[i].begin(),v[i].end());vis[1]=1;dfs(1);//vis[1]=0;for(int i=0,j=ans.size();i<j;i++)printf("%d ",ans[i]);//cout << "Hello world!" << endl;return 0; }

C++版本二

#include<stdio.h> #include<stdlib.h> #include<ctype.h> #include<math.h> #include<string.h> #include<queue> #include<algorithm> #include<vector> #define ll long long #define pb push_back #define INF 0x3f3f3f3f; #define test printf("here!!!") using namespace std; const int mx=1e5+10; const int mod=998244353; int vis[mx]; priority_queue<int,vector<int>,greater<int> >q; vector<int>vec[mx]; void dfs(int st) {printf("1 ");while (!q.empty()){int nx=q.top();q.pop();if (!vis[nx]){printf("%d ",nx);vis[nx]=1;for (int i=vec[nx].size()-1;i>=0;--i){if (!vis[vec[nx][i]]) q.push(vec[nx][i]);}}} } int main() {int n,m,u,v;scanf("%d%d",&n,&m);for (int i=1;i<=m;++i){scanf("%d%d",&u,&v);vec[u].pb(v);vec[v].pb(u);if (u==1){q.push(v);}else if (v==1){q.push(u);}}vis[1]=1;dfs(1); }

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