#808905 (C++17) No.1995 CHIKA Road

• 問題: No.1995 CHIKA Road
• ユーザー: 👑 AngrySadEight
• 提出日時: 2022-10-20 00:31:03
• 言語: C++17 (gcc 13.3.0 + boost 1.87.0)
• 結果: AC
• 実行時間: 104 ms / 2,000 ms
• コード長: 2,548 bytes
• コンパイル時間: 4,074 ms
• コンパイル使用メモリ: 254,820 KB
• 最終ジャッジ日時: 2025-02-08 08:27:21
• ジャッジサーバーID （参考情報）: judge5 / judge2

ファイルパターン	結果
sample	AC * 3
other	AC * 37

ソースコード

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#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
typedef long long ll;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define repr(i, n) for (int i = (int)(n) - 1; i >= 0; i--)
#define repk(i, k, n) for (int i = k; i < (int)(n); i++)
#define all(v) v.begin(), v.end()
#define mod1 1000000007
#define mod2 998244353
#define mod3 100000007
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define vvi vector<vector<int>>
#define vvc vector<vector<char>>
#define vvl vector<vector<ll>>
#define vvvi vector<vector<vector<int>>>
#define vvvl vector<vector<vector<ll>>>
#define pii pair<int,int>
#define pil pair<int,ll>
#define pli pair<ll, int>
#define pll pair<ll, ll>
#define vpii vector<pair<int,int>>
#define vpll vector<pair<ll,ll>>
#define vvpii vector<vector<pair<int,int>>>
#define vvpll vector<vector<pair<ll,ll>>>
template<typename T> void debug(T e){
    cerr << e << endl;
}
template<typename T> void debug(vector<T> &v){
    rep(i, v.size()){
        cerr << v[i] << " ";
    }
    cerr << endl;
}
template<typename T> void debug(vector<vector<T>> &v){
    rep(i, v.size()){
        rep(j, v[i].size()){
            cerr << v[i][j] << " ";
        }
        cerr << endl;
    }
}
template<typename T> void debug(vector<pair<T, T>> &v){
    rep(i,v.size()){
        cerr << v[i].first << " " << v[i].second << endl;
    }
}
template<typename T> void debug(set<T> &st){
    for (auto itr = st.begin(); itr != st.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}
template<typename T> void debug(multiset<T> &ms){
    for (auto itr = ms.begin(); itr != ms.end(); itr++){
        cerr << *itr << " ";
    }
    cerr << endl;
}
template<typename T> void debug(map<T, T> &mp){
    for (auto itr = mp.begin(); itr != mp.end(); itr++){
        cerr << itr->first << " " << itr->second << endl;
    }
}
void debug_out(){
    cerr << endl;
}
template <typename Head, typename... Tail>
void debug_out(Head H, Tail... T){
    cerr << H << " ";
    debug_out(T...);
}
int main(){
    ll N,M;
    cin >> N >> M;
    vl A(M);
    vl B(M);
    rep(i,M){
        cin >> A[i] >> B[i];
    }
    vector<pll> p(M);
    for (ll i = 0; i < M; i++){
        p[i].first = B[i];
        p[i].second = A[i];
    }
    sort(all(p));
    
    ll now = 1;
    ll cnt = 0;
    for (ll i = 0; i < M; i++){
        if (now <= p[i].second){
            now = p[i].first;
            cnt++;
        }
    }
    cout << (N - 1) * 2 - cnt << endl;
}
 
 
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