結果
問題 | No.583 鉄道同好会 |
ユーザー | しらっ亭 |
提出日時 | 2017-10-28 01:12:40 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 32 ms / 2,000 ms |
コード長 | 5,518 bytes |
コンパイル時間 | 1,341 ms |
コンパイル使用メモリ | 126,240 KB |
実行使用メモリ | 6,820 KB |
最終ジャッジ日時 | 2024-11-22 00:09:23 |
合計ジャッジ時間 | 2,189 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge3 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 2 ms
6,816 KB |
testcase_01 | AC | 1 ms
6,820 KB |
testcase_02 | AC | 2 ms
6,816 KB |
testcase_03 | AC | 2 ms
6,820 KB |
testcase_04 | AC | 2 ms
6,820 KB |
testcase_05 | AC | 2 ms
6,816 KB |
testcase_06 | AC | 2 ms
6,820 KB |
testcase_07 | AC | 2 ms
6,816 KB |
testcase_08 | AC | 2 ms
6,816 KB |
testcase_09 | AC | 1 ms
6,816 KB |
testcase_10 | AC | 2 ms
6,816 KB |
testcase_11 | AC | 10 ms
6,820 KB |
testcase_12 | AC | 13 ms
6,820 KB |
testcase_13 | AC | 12 ms
6,820 KB |
testcase_14 | AC | 12 ms
6,820 KB |
testcase_15 | AC | 15 ms
6,816 KB |
testcase_16 | AC | 27 ms
6,816 KB |
testcase_17 | AC | 32 ms
6,820 KB |
testcase_18 | AC | 32 ms
6,816 KB |
ソースコード
#include <iostream> #include <algorithm> #include <bitset> #include <map> #include <queue> #include <set> #include <stack> #include <string> #include <utility> #include <vector> #include <array> #include <unordered_map> #include <complex> #include <deque> #include <cassert> #include <cmath> #include <functional> #include <iomanip> #include <chrono> #include <random> #include <numeric> #include <tuple> #include <cstring> using namespace std; #define forr(x,arr) for(auto&& x:arr) #define _overload3(_1,_2,_3,name,...) name #define _rep2(i,n) _rep3(i,0,n) #define _rep3(i,a,b) for(int i=int(a);i<int(b);++i) #define rep(...) _overload3(__VA_ARGS__,_rep3,_rep2,)(__VA_ARGS__) #define _rrep2(i,n) _rrep3(i,0,n) #define _rrep3(i,a,b) for(int i=int(b)-1;i>=int(a);i--) #define rrep(...) _overload3(__VA_ARGS__,_rrep3,_rrep2,)(__VA_ARGS__) #define all(x) (x).begin(),(x).end() #define bit(n) (1LL<<(n)) #define sz(x) ((int)(x).size()) #define TEN(n) ((ll)(1e##n)) #define fst first #define snd second string DBG_DLM(int &i){return(i++==0?"":", ");} #define DBG_B(exp){int i=0;os<<"{";{exp;}os<<"}";return os;} template<class T>ostream&operator<<(ostream&os,vector<T>v); template<class T>ostream&operator<<(ostream&os,set<T>v); template<class T>ostream&operator<<(ostream&os,queue<T>q); template<class T>ostream&operator<<(ostream&os,priority_queue<T>q); template<class T,class K>ostream&operator<<(ostream&os,pair<T,K>p); template<class T,class K>ostream&operator<<(ostream&os,map<T,K>mp); template<class T,class K>ostream&operator<<(ostream&os,unordered_map<T,K>mp); template<int I,class TPL>void DBG(ostream&os,TPL t){} template<int I,class TPL,class H,class...Ts>void DBG(ostream&os,TPL t){os<<(I==0?"":", ")<<get<I>(t);DBG<I+1,TPL,Ts...>(os,t);} template<class T,class K>void DBG(ostream&os,pair<T,K>p,string delim){os<<"("<<p.first<<delim<<p.second<<")";} template<class...Ts>ostream&operator<<(ostream&os,tuple<Ts...>t){os<<"(";DBG<0,tuple<Ts...>,Ts...>(os,t);os<<")";return os;} template<class T,class K>ostream&operator<<(ostream&os,pair<T,K>p){DBG(os,p,", ");return os;} template<class T>ostream&operator<<(ostream&os,vector<T>v){DBG_B(forr(t,v){os<<DBG_DLM(i)<<t;});} template<class T>ostream&operator<<(ostream&os,set<T>s){DBG_B(forr(t,s){os<<DBG_DLM(i)<<t;});} template<class T>ostream&operator<<(ostream&os,queue<T>q){DBG_B(for(;q.size();q.pop()){os<<DBG_DLM(i)<<q.front();});} template<class T>ostream&operator<<(ostream&os,priority_queue<T>q){DBG_B(for(;q.size();q.pop()){os<<DBG_DLM(i)<<q.top();});} template<class T,class K>ostream&operator<<(ostream&os,map<T,K>m){DBG_B(forr(p,m){os<<DBG_DLM(i);DBG(os,p,"->");});} template<class T,class K>ostream&operator<<(ostream&os,unordered_map<T,K>m){DBG_B(forr(p,m){os<<DBG_DLM(i);DBG(os,p,"->");});} #define DBG_OVERLOAD(_1,_2,_3,_4,_5,_6,macro_name,...)macro_name #define DBG_LINE(){char s[99];sprintf(s,"line:%3d | ",__LINE__);cerr<<s;} #define DBG_OUTPUT(v){cerr<<(#v)<<"="<<(v);} #define DBG1(v,...){DBG_OUTPUT(v);} #define DBG2(v,...){DBG_OUTPUT(v);cerr<<", ";DBG1(__VA_ARGS__);} #define DBG3(v,...){DBG_OUTPUT(v);cerr<<", ";DBG2(__VA_ARGS__);} #define DBG4(v,...){DBG_OUTPUT(v);cerr<<", ";DBG3(__VA_ARGS__);} #define DBG5(v,...){DBG_OUTPUT(v);cerr<<", ";DBG4(__VA_ARGS__);} #define DBG6(v,...){DBG_OUTPUT(v);cerr<<", ";DBG5(__VA_ARGS__);} #define DEBUG0(){DBG_LINE();cerr<<endl;} #ifdef LOCAL #define out(...){DBG_LINE();DBG_OVERLOAD(__VA_ARGS__,DBG6,DBG5,DBG4,DBG3,DBG2,DBG1)(__VA_ARGS__);cerr<<endl;} #else #define out(...) #endif using ll=long long; using pii=pair<int,int>;using pll=pair<ll,ll>;using pil=pair<int,ll>;using pli=pair<ll,int>; using vs=vector<string>;using vvs=vector<vs>;using vvvs=vector<vvs>; using vb=vector<bool>;using vvb=vector<vb>;using vvvb=vector<vvb>; using vi=vector<int>;using vvi=vector<vi>;using vvvi=vector<vvi>; using vl=vector<ll>;using vvl=vector<vl>;using vvvl=vector<vvl>; using vd=vector<double>;using vvd=vector<vd>;using vvvd=vector<vvd>; using vpii=vector<pii>;using vvpii=vector<vpii>;using vvvpii=vector<vvpii>; template<class A,class B>bool amax(A&a,const B&b){return b>a?a=b,1:0;} template<class A,class B>bool amin(A&a,const B&b){return b<a?a=b,1:0;} ll ri(){ll l;cin>>l;return l;} string rs(){string s;cin>>s;return s;} struct UnionFind { const int V; vector<int> par, rank, cnt; UnionFind(int V) : V(V), par(V), rank(V), cnt(V) { init(); } void init() { for (int i = 0; i < V; i++) par[i] = i; fill(rank.begin(), rank.end(), 0); fill(cnt.begin(), cnt.end(), 1); } int find(int x) { return par[x] == x ? x : par[x] = find(par[x]); } bool unite(int x, int y) { if ((x = find(x)) == (y = find(y))) return false; cnt[y] = cnt[x] = cnt[x] + cnt[y]; if (rank[x] < rank[y]) par[x] = y; else { par[y] = x; if (rank[x] == rank[y]) rank[x]++; } return true; } bool same(int x, int y) { return find(x) == find(y); } int count(int x) { return cnt[find(x)]; } }; bool solve() { int n = ri(), m = ri(); UnionFind uf(n); vi S; vi D(n); rep(i, m) { int a = ri(), b = ri(); uf.unite(a, b); S.emplace_back(a); S.emplace_back(b); D[a]++; D[b]++; } sort(all(S)); S.erase(unique(S.begin(), S.end()), S.end()); forr(s, S) { if (!uf.same(S[0], s)) return false; } int odd = 0; forr(s, S) { if (D[s] & 1) odd++; } return odd == 0 || odd == 2; } void Main() { cout << (solve() ? "YES" : "NO") << endl; } signed main() { cin.tie(nullptr); ios::sync_with_stdio(false); Main(); return 0; }