#627370 (C++17) No.274 The Wall

• 問題: No.274 The Wall
• ユーザー: pione
• 提出日時: 2021-03-11 01:13:24
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 488 ms / 2,000 ms
• コード長: 4,753 bytes
• コンパイル時間: 2,356 ms
• コンパイル使用メモリ: 215,228 KB
• 最終ジャッジ日時: 2025-01-19 13:27:22
• ジャッジサーバーID （参考情報）: judge3 / judge1

ファイルパターン	結果
sample	AC * 4
other	AC * 22

ソースコード

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
#include <bits/stdc++.h>
using namespace std;
// #include <atcoder/all>
// using namespace atcoder;
// #define int long long
#define rep(i, n) for (long long i = (long long)(0); i < (long long)(n); ++i)
#define reps(i, n) for (long long i = (long long)(1); i <= (long long)(n); ++i)
#define rrep(i, n) for (long long i = ((long long)(n)-1); i >= 0; i--)
#define rreps(i, n) for (long long i = ((long long)(n)); i > 0; i--)
#define irep(i, m, n) for (long long i = (long long)(m); i < (long long)(n); ++i)
#define ireps(i, m, n) for (long long i = (long long)(m); i <= (long long)(n); ++i)
#define irreps(i, m, n) for (long long i = ((long long)(n)-1); i > (long long)(m); ++i)
#define SORT(v, n) sort(v, v + n);
#define REVERSE(v, n) reverse(v, v+n);
#define vsort(v) sort(v.begin(), v.end());
#define all(v) v.begin(), v.end()
#define mp(n, m) make_pair(n, m);
#define cinline(n) getline(cin,n);
#define replace_all(s, b, a) replace(s.begin(),s.end(), b, a);
#define PI (acos(-1))
#define FILL(v, n, x) fill(v, v + n, x);
#define sz(x) (long long)(x.size())
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using vll = vector<ll>;
using vvll = vector<vll>;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using vs = vector<string>;
using vpll = vector<pair<ll, ll>>;
using vtp = vector<tuple<ll,ll,ll>>;
using vb = vector<bool>;
using ld = long double;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<class t> using vc=vector<t>;
template<class t> using vvc=vc<vc<t>>;
const ll INF = 1e9+10;
const ll MOD = 1e9+7;
// const ll MOD = 998244353;
const ll LINF = 1e18;
struct StronglyConnectedComponents {
  int n;
  vector<vector<int>> G, rG;
  vector<int> order, component;
  vector<bool> used;
  void dfs(int v) {
    used[v] = 1;
    for (auto nv : G[v]) {
      if (!used[nv]) dfs(nv);
    }
    order.push_back(v);
  }
  void rdfs(int v, int k) {
    component[v] = k;
    for (auto nv : rG[v]) {
      if (component[nv] < 0) rdfs(nv, k);
    }
  }
  StronglyConnectedComponents(vector<vector<int>> &_G) {
    n = _G.size();
    G = _G;
    rG.resize(n);
    component.assign(n, -1);
    used.resize(n);
    for (int v = 0; v < n; v++) {
      for (auto nv : G[v]) rG[nv].push_back(v);
    }
    for (int v = 0; v < n; v++) if (!used[v]) dfs(v);
    int k = 0;
    reverse(order.begin(), order.end());
    for (auto v : order) if (component[v] == -1) rdfs(v, k), k++;
  }
  /// 頂点(u, v)が同じ強連結成分に含まれるか
  bool is_same(int u, int v) { return component[u] == component[v]; }
  /// 強連結成分を1つのノードに潰したグラフを再構築する
  vector<vector<int>> rebuild() {
    int N = *max_element(component.begin(), component.end()) + 1;
    vector<vector<int>> rebuildedG(N);
    set<pair<int, int>> connected;
    for (int v = 0; v < N; v++) {
      for (auto nv : G[v]) {
        if (component[v] != component[nv] and !connected.count(pair(v, nv))) {
          connected.insert(pair(v, nv));
          rebuildedG[component[v]].push_back(component[nv]);
        }
      }
    }
    return rebuildedG;
  }
};
// implication graph
// 1つの区間を1つのノードと捉える
// 反転した区間を￢と捉える
// ある2つの区間が重なる可能性があるとき、A∨Bとして辺を張る
signed main()
{
  cin.tie( 0 ); ios::sync_with_stdio( false );
  
  int n,m; cin>>n>>m;
  vc<int> l(n), r(n);
  rep(i,n) cin>>l[i]>>r[i];
  
  vc<vc<int>> G(2*n);
  rep(i,n){
    irep(j,i+1,n){
      int l1=l[i], r1=r[i], l2=l[j], r2=r[j];
      int L1=m-r1-1, R1=m-l1-1, L2=m-r2-1, R2=m-l2-1;
      if(l1<=l2 and l2<=r1 or l1<=r2 and r2<=r1
        or l2<=l1 and l1<=r2){
        // A∨B <=> ￢A=>B∧￢B=>A
        G[i+n].push_back(j);
        G[j+n].push_back(i);
      }
      if(l1<=L2 and L2<=r1 or l1<=R2 and R2<=r1
        or L2<=l1 and l1<=R2){
        // A∨￢B <=> ￢A=>￢B∧B=>A
        G[i+n].push_back(j+n);
        G[j].push_back(i);
      }
      if(L1<=l2 and l2<=R1 or L1<=r2 and r2<=R1
        or l2<=L1 and L1<=r2){
        // ￢A∨B <=> A=>B∧￢B=>￢A
        G[i].push_back(j);
        G[j+n].push_back(i+n);
      }
      if(L1<=L2 and L2<=R1 or L1<=R2 and R2<=R1
        or L2<=L1 and L1<=R2){
        // ￢A∨￢B <=> A=>￢B∧B=>￢A
        G[i].push_back(j+n);
        G[j].push_back(i+n);
      }
    }
  }
  // rep(i,n){
  //   cout<<i<<':';
  //   for(auto e: G[i]) cout<<e<<' ';
  //   cout<<endl;
  // }
  
  auto scc = StronglyConnectedComponents(G);
  rep(i,n){
    if(scc.is_same(i,i+n)){
      cout<<"NO"<<endl;
      return 0;
    }
  }
  cout<<"YES"<<endl;
}
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX