結果
問題 | No.1254 補強への架け橋 |
ユーザー |
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提出日時 | 2020-10-09 22:00:19 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 99 ms / 2,000 ms |
コード長 | 4,472 bytes |
コンパイル時間 | 1,606 ms |
コンパイル使用メモリ | 142,100 KB |
最終ジャッジ日時 | 2025-01-15 04:40:03 |
ジャッジサーバーID (参考情報) |
judge3 / judge5 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 123 |
ソースコード
#include <string>#include <vector>#include<iostream>#include<cstdio>#include<cstdlib>#include<stack>#include<queue>#include<cmath>#include<algorithm>#include<functional>#include<list>#include<deque>#include<bitset>#include<set>#include<map>#include<unordered_map>#include<unordered_set>#include<cstring>#include<sstream>#include<complex>#include<iomanip>#include<numeric>#include<cassert>#include<random>#define X first#define Y second#define pb push_back#define rep(X,Y) for (int (X) = 0;(X) < (int)(Y);++(X))#define reps(X,S,Y) for (int (X) = (int)(S);(X) < (int)(Y);++(X))#define rrep(X,Y) for (int (X) = (int)(Y)-1;(X) >=0;--(X))#define rreps(X,S,Y) for (int (X) = (int)(Y)-1;(X) >= (int)(S);--(X))#define repe(X,Y) for ((X) = 0;(X) < (Y);++(X))#define peat(X,Y) for (;(X) < (Y);++(X))#define all(X) (X).begin(),(X).end()#define rall(X) (X).rbegin(),(X).rend()#define eb emplace_back#define UNIQUE(X) (X).erase(unique(all(X)),(X).end())#define Endl endl#define NL <<"\n"#define cauto const autousing namespace std;using ll=long long;using pii=pair<int,int>;using pll=pair<ll,ll>;template<class T> using vv=vector<vector<T>>;template<class T> inline bool MX(T &l,const T &r){return l<r?l=r,1:0;}template<class T> inline bool MN(T &l,const T &r){return l>r?l=r,1:0;}//#undef NUIP#ifdef NUIP#include "benri.h"#else#define out(args...)#endif#ifdef __cpp_init_capturestemplate<typename T>vector<T> table(int n, T v){ return vector<T>(n, v);}template <class... Args> auto table(int n, Args... args){auto val = table(args...); return vector<decltype(val)>(n, move(val));}#endiftemplate<class A,class B> pair<A,B> operator+(const pair<A,B> &p,const pair<A,B> &q){ return {p.X+q.X,p.Y+q.Y};}template<class A,class B,class C,class D> pair<A,B>& operator+=(pair<A,B> &p,const pair<C,D> &q){ p.X+=q.X; p.Y+=q.Y; return p;}template<class A,class B> pair<A,B> operator-(const pair<A,B> &p,const pair<A,B> &q){ return {p.X-q.X,p.Y-q.Y};}template<class A,class B,class C,class D> pair<A,B>& operator-=(pair<A,B> &p,const pair<C,D> &q){ p.X-=q.X; p.Y-=q.Y; return p;}template<class A,class B> istream& operator>>(istream &is, pair<A,B> &p){ is>>p.X>>p.Y; return is;}template<class T=ll> T read(){ T re; cin>>re; return move(re);}template<class T=ll> T read(const T &dec){ T re; cin>>re; return re-dec;}template<class T=ll> vector<T> readV(const int sz){ vector<T> re(sz); for(auto &x:re) x=read<T>(); return move(re);}template<class T=ll> vector<T> readV(const int sz, const T &dec){ vector<T> re(sz); for(auto &x:re) x=read<T>(dec); return move(re);}vv<int> readG(const int &n,const int &m){ vv<int> g(n); rep(_,m){ cauto a=read<int>(1),b=read<int>(1); g[a].pb(b); g[b].pb(a);} return move(g);}vv<int> readG(const int &n){ return readG(n,n-1);}const ll MOD=1e9+7; //998244353class Bcc{vector<int> num,inS;stack<int> roots,st;int cnt;public:vv<int> bcc,tree,tedge;vector<int> brdg,inv;void dfs(const vv<int> &g,const vector<pii> &es,int v,int e){num[v]=++cnt;st.push(v); inS[v]=1; roots.push(v);for(const int &i:g[v])if(i!=e){int w=es[i].X+es[i].Y-v;if(!num[w]){dfs(g,es,w,i);}else if(inS[w]){while(num[roots.top()]>num[w]) roots.pop();}}if(v==roots.top()){brdg.pb(e);bcc.pb(vector<int>());while(1){int w=st.top(); st.pop(); inS[w]=0;bcc.back().pb(w);if(v==w) break;}roots.pop();}}Bcc(vv<int> &g,vector<pii> es){const int n=g.size();num.resize(n); inS.resize(n);int cnt=0;rep(i,n)if(!num[i]){dfs(g,es,i,-1);brdg.pop_back();}const int m=bcc.size();inv.resize(n);rep(i,m) for(const int &v:bcc[i]) inv[v]=i;for(pii &p:es){p.X=inv[p.X]; p.Y=inv[p.Y];}//sort(all(es)); UNIQUE(es);tree.resize(m); tedge.resize(m);int i=0;for(const pii &p:es){if(p.X!=p.Y){tree[p.X].pb(p.Y);tree[p.Y].pb(p.X);tedge[p.X].pb(i);tedge[p.Y].pb(i);}++i;}}};int main(){ios_base::sync_with_stdio(false); cin.tie(0);cout<<fixed<<setprecision(0);cauto n=read();cauto es=readV<pii>(n,{1,1});vv<int> g(n);rep(i,n){g[es[i].X].eb(i);g[es[i].Y].eb(i);}vector<int> isB(n);Bcc h(g,es);for(cauto b:h.brdg) isB[b]=1;vector<int> re;rep(i,n)if(!isB[i]) re.eb(i);cout<<re.size() NL;rep(i,re.size()) cout<<re[i]+1<<" \n"[i+1==re.size()];return 0;}