結果

問題 No.274 The Wall
ユーザー MMRZ
提出日時 2024-06-09 18:39:34
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 23 ms / 2,000 ms
コード長 4,915 bytes
コンパイル時間 4,515 ms
コンパイル使用メモリ 268,240 KB
実行使用メモリ 5,248 KB
最終ジャッジ日時 2024-12-30 16:04:48
合計ジャッジ時間 5,526 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge5
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 * 4
other AC * 22
権限があれば一括ダウンロードができます

ソースコード

diff #
プレゼンテーションモードにする

#line 1 "274.test.cpp"
#define PROBLEM "https://yukicoder.me/problems/no/274"
#line 1 "/home/mmrz/competitive_programming/cp_templates/template/template.hpp"
# include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ull = unsigned long long;
const double pi = acos(-1);
template<class T>constexpr T inf() { return ::std::numeric_limits<T>::max(); }
template<class T>constexpr T hinf() { return inf<T>() / 2; }
template <typename T_char>T_char TL(T_char cX) { return tolower(cX); }
template <typename T_char>T_char TU(T_char cX) { return toupper(cX); }
template<class T> bool chmin(T& a,T b) { if(a > b){a = b; return true;} return false; }
template<class T> bool chmax(T& a,T b) { if(a < b){a = b; return true;} return false; }
int popcnt(unsigned long long n) { int cnt = 0; for (int i = 0; i < 64; i++)if ((n >> i) & 1)cnt++; return cnt; }
int d_sum(ll n) { int ret = 0; while (n > 0) { ret += n % 10; n /= 10; }return ret; }
int d_cnt(ll n) { int ret = 0; while (n > 0) { ret++; n /= 10; }return ret; }
ll gcd(ll a, ll b) { if (b == 0)return a; return gcd(b, a%b); };
ll lcm(ll a, ll b) { ll g = gcd(a, b); return a / g*b; };
ll MOD(ll x, ll m){return (x%m+m)%m; }
ll FLOOR(ll x, ll m) {ll r = (x%m+m)%m; return (x-r)/m; }
template<class T> using dijk = priority_queue<T, vector<T>, greater<T>>;
# define all(qpqpq)           (qpqpq).begin(),(qpqpq).end()
# define UNIQUE(wpwpw)        (wpwpw).erase(unique(all((wpwpw))),(wpwpw).end())
# define LOWER(epepe)         transform(all((epepe)),(epepe).begin(),TL<char>)
# define UPPER(rprpr)         transform(all((rprpr)),(rprpr).begin(),TU<char>)
# define rep(i,upupu)         for(ll i = 0, i##_len = (upupu);(i) < (i##_len);(i)++)
# define reps(i,opopo)        for(ll i = 1, i##_len = (opopo);(i) <= (i##_len);(i)++)
# define len(x)                ((ll)(x).size())
# define bit(n)               (1LL << (n))
# define pb push_back
# define exists(c, e)         ((c).find(e) != (c).end())
struct INIT{
    INIT(){
        std::ios::sync_with_stdio(false);
        std::cin.tie(0);
        cout << fixed << setprecision(20);
    }
}INIT;
namespace mmrz {
    void solve();
}
int main(){
    mmrz::solve();
}
#line 1 "/home/mmrz/competitive_programming/cp_templates/graph/two_sat.hpp"
#line 1 "/home/mmrz/competitive_programming/cp_templates/graph/strongly_connected_components.hpp"
struct scc_graph {
    vector<vector<int>> g;
    vector<vector<int>> rg;
    vector<bool> used;
    vector<int> cmp;
    vector<int> vs;
    int n;
    int k;
    scc_graph(int _n) : n(_n), k(0) {
        g.resize(n);
        rg.resize(n);
        used.resize(n);
        cmp.resize(n);
    }
    void add_edge(int a, int b) {
        g[a].push_back(b);
        rg[b].push_back(a);
    }
    void dfs(int v){
        used[v] = true;
        for(auto to : g[v]){
            if(not used[to])dfs(to);
        }
        vs.pb(v);
    }
    void rdfs(int v, int col){
        used[v] = true;
        cmp[v] = col;
        for(auto to : rg[v]){
            if(not used[to])rdfs(to, col);
        }
    }
    vector<vector<int>> scc() {
        for(int i = 0;i < n;i++){
            if(not used[i])dfs(i);
        }
        for(int i = 0;i < n;i++){
            used[i] = false;
        }
        for(auto i = vs.rbegin();i != vs.rend();i++){
            if(not used[*i])rdfs(*i, k++);
        }
        vector<vector<int>> ret(k);
        for(int i = 0;i < n;i++){
            ret[cmp[i]].push_back(i);
        }
        return ret;
    }
};
#line 3 "/home/mmrz/competitive_programming/cp_templates/graph/two_sat.hpp"
struct two_sat {
    int n;
    scc_graph g;
    two_sat(int _n) : n(_n), g(scc_graph(2*n)) {}
    // (i = f1) || (j = f2)
    void add_clause(int i, bool f1, int j, bool f2){
        g.add_edge((i << 1) ^ !f1, (j << 1) ^ f2);
        g.add_edge((j << 1) ^ !f2, (i << 1) ^ f1);
    }
    // (i = f1) -> (j = f2) <=> (1 = !f1) || (j = f2)
    void add_if(int i, bool f1, int j, bool f2){
        add_clause(i, !f1, j, f2);
    }
    // i
    void set_true(int i){
        add_clause(i, true, i, true);
    }
    // !i
    void set_false(int i){
        add_clause(i, false, i, false);
    }
    vector<bool> solve(){
        vector<vector<int>> scc = g.scc();
        vector<int> c(2*n);
        for(int i = 0;i < (int)scc.size();i++){
            for(auto v : scc[i]){
                c[v] = i;
            }
        }
        vector<bool> res(n);
        for(int i = 0;i < n;i++){
            if(c[i << 1] == c[i << 1 | 1])return vector<bool>();
            res[i] = (c[i << 1] < c[i << 1 | 1]);
        }
        return res;
    }
};
#line 5 "274.test.cpp"
void mmrz::solve(){
    int n, m;
    cin >> n >> m;
    two_sat ts(n);
    vector<int> l(n), r(n);
    rep(i, n){
        cin >> l[i] >> r[i];
        r[i]++;
    }
    auto is_overlap = [&](int l1, int r1, int l2, int r2) -> bool {
        return not (r1 <= l2 || r2 <= l1);
    };
    rep(i, n){
        rep(j, n){
            if(i == j)continue;
            bool f1 = is_overlap(l[i], r[i], l[j], r[j]);
            bool f2 = is_overlap(l[i], r[i], m-r[j], m-l[j]);
            if(not f1 && not f2)continue;
            if(f1 && f2){
                cout << "NO" << endl;
                return;
            }
            if(f1){
                ts.add_if(i, true, j, false);
                ts.add_if(i, false, j, true);
            }
            if(f2){
                ts.add_if(i, true, j, true);
                ts.add_if(i, false, j, false);
            }
        }
    }
    auto ret = ts.solve();
    cout << (len(ret) ? "YES" : "NO") << endl;
}
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