結果

問題 No.274 The Wall
ユーザー pazzle1230
提出日時 2018-02-28 02:52:51
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
WA  
実行時間 -
コード長 3,733 bytes
コンパイル時間 2,705 ms
コンパイル使用メモリ 196,604 KB
実行使用メモリ 706,972 KB
最終ジャッジ日時 2024-12-14 15:19:26
合計ジャッジ時間 23,390 ms
ジャッジサーバーID
（参考情報） 		judge4 / judge1
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 3 WA * 1
other AC * 4 WA * 7 MLE * 11
権限があれば一括ダウンロードができます
コンパイルメッセージ
In member function 'Graph<0>& Graph<0>::operator=(const Graph<0>&)',
    inlined from 'int32 SCC::build()' at main.cpp:103:27,
    inlined from 'bool TwoSAT::build()' at main.cpp:147:12,
    inlined from 'int main()' at main.cpp:184:14:
main.cpp:27:7: warning: '<anonymous>.Graph<0>::E' may be used uninitialized [-Wmaybe-uninitialized]
   27 | class Graph{
      |       ^~~~~
main.cpp: In function 'int main()':
main.cpp:103:41: note: '<anonymous>' declared here
  103 |                 newG = Graph<DIRECTED>(k);
      |                                         ^

ソースコード

diff #
プレゼンテーションモードにする

#include <bits/stdc++.h>
using namespace std;
#define INF_LL (int64)1e18
#define INF (int32)1e9
#define REP(i, n) for(int i = 0;i < (n);i++)
#define FOR(i, a, b) for(int i = (a);i < (b);i++)
#define all(x) x.begin(),x.end()
#define fs first
#define sc second
using int32 = int_fast32_t;
using uint32 = uint_fast32_t;
using int64 = int_fast64_t;
using uint64 = uint_fast64_t;
using PII = pair<int32, int32>;
using PLL = pair<int64, int64>;
const double eps = 1e-10;
template<typename A, typename B>inline void chmin(A &a, B b){if(a > b) a = b;}
template<typename A, typename B>inline void chmax(A &a, B b){if(a < b) a = b;}
const int32 DIRECTED = 0;
const int32 UNDIRECTED = 1;
template<int32 isUNDIRECTED=0>
class Graph{
    struct Edge{
        int32 u, v;
        //id;
        //int32 c;
        Edge(int32 u, int32 v, int32 c=0, int32 id=0):u(u), v(v){}
    };
    int32 V, E;
    vector<vector<Edge>> G;
    vector<Edge> Es;
public:
    Graph(){}
    Graph(int32 V):V(V){G.resize(V);}
    Graph(const Graph<isUNDIRECTED>& g):V(g.V), E(g.E), G(g.G), Es(g.Es){}
    void add_edge(int32 u, int32 v, int32 c=0, int32 id=0){
        G[u].emplace_back(u, v);
        if(isUNDIRECTED) G[v].emplace_back(v, u, c, id);
        //Es.emplace_back(u, v, c, id);
        E++;
    }
    const vector<Edge>& operator[](int32 k){
        return G[k];
    }
};
class SCC{
private:
    Graph<DIRECTED> orgG, revG, newG;
    vector<int32> ord, comp;
    vector<bool> used;
    vector<vector<int32>> vs;
    int32 V, nV;
public:
    SCC(){}
    SCC(int32 V):orgG(V), revG(V), comp(V, -1), used(V, 0), V(V){}
    void add_edge(int32 u, int32 v){
        orgG.add_edge(u, v);
        revG.add_edge(v, u);
    }
    void dfs(int32 v){
        used[v] = true;
        for(auto e : orgG[v]){
            if(!used[e.v]) dfs(e.v);
        }
        ord.push_back(v);
    }
    void rdfs(int32 v, int32 k){
        used[v] = true;
        comp[v] = k;
        for(auto e : revG[v]){
            if(!used[e.v]) rdfs(e.v, k);
        }
    }
    int32 build(){
        for(int32 i = 0;i < V;i++){
            if(!used[i]) dfs(i);
        }
        fill(used.begin(), used.end(), 0);
        int32 k = 0;
        for(int32 i = ord.size()-1;i >= 0;i--){
            if(!used[ord[i]]) rdfs(ord[i], k++);
        }
        nV = k;
        vs.resize(k, vector<int32>());
        for(int32 i = 0;i < V;i++)
            vs[comp[i]].push_back(i);
        newG = Graph<DIRECTED>(k);
        for(int32 i = 0;i < V;i++){
            for(auto e : orgG[i]){
                if(comp[i] != comp[e.v])
                    newG.add_edge(comp[i], comp[e.v]);
            }
        }
        return k;
    }
    int32 size(){
        return nV;
    }
    const Graph<DIRECTED>& graph(){
        return newG;
    }
    const vector<int32>& vertices(int32 v){
        return vs[v];
    }
    int32 operator[](int32 k){
        return comp[k];
    }
};
class TwoSAT{
private:
    SCC scc;
    int32 n;
    vector<bool> truth;
public:
    TwoSAT(){}
    TwoSAT(int32 n):n(n), scc(2*n){}
    void add_state(int32 a, bool truth1, int32 b, bool truth2){
        int32 na = truth1 ? a+n : a, nb = truth2 ? b+n : b;
        a = truth1 ? a : a+n; b = truth2 ? b : b+n;
        scc.add_edge(na, b);
        scc.add_edge(nb, a);
    }
    bool build(){
        scc.build();
        for(int32 i = 0;i < n;i++){
            if(scc[i] == scc[i+n]) return false;
            if(scc[i] > scc[i+n]) truth.push_back(true);
            else truth.push_back(false);
        }
        return true;
    }
    const vector<bool>& result(){
        return truth;
    }
    bool operator[](int32 k){
        return truth[k];
    }
};
int main(void){
    cin.tie(0);
    ios::sync_with_stdio(false);
    int32 N, M;
    cin >> N >> M;
    vector<PII> wall;
    wall.resize(N);
    REP(i, N)
        cin >> wall[i].fs >> wall[i].sc;
    TwoSAT scc(N);
    REP(i, N){
        REP(j, N){
            if(i == j) continue;
            PII rw1(M-wall[i].sc-1, M-wall[i].fs-1), rw2(M-wall[j].sc-1, M-wall[j].fs-1);
            if(!(max(wall[i].sc, wall[j].sc) < min(wall[i].fs, wall[j].fs))) scc.add_state(i, 0, j, 0);
            if(!(max(wall[i].sc, rw2.sc) < min(wall[i].fs, rw2.fs))) scc.add_state(i, 0, j, 1);
        }
    }
    if(scc.build())
        cout << "YES" << endl;
    else
        cout << "NO" << endl;
}
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