結果

問題 No.1995 CHIKA Road
ユーザー cutmdocutmdo
提出日時 2022-07-16 01:19:31
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 244 ms / 2,000 ms
コード長 4,552 bytes
コンパイル時間 3,749 ms
コンパイル使用メモリ 266,808 KB
実行使用メモリ 24,960 KB
最終ジャッジ日時 2024-06-27 23:33:57
合計ジャッジ時間 9,330 ms
ジャッジサーバーID
（参考情報） 		judge5 / judge2
このコードへのチャレンジ
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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
5,248 KB
testcase_01 AC 2 ms
5,376 KB
testcase_02 AC 2 ms
5,376 KB
testcase_03 AC 2 ms
5,376 KB
testcase_04 AC 2 ms
5,376 KB
testcase_05 AC 2 ms
5,376 KB
testcase_06 AC 11 ms
5,376 KB
testcase_07 AC 43 ms
7,936 KB
testcase_08 AC 2 ms
5,376 KB
testcase_09 AC 2 ms
5,376 KB
testcase_10 AC 84 ms
11,008 KB
testcase_11 AC 244 ms
24,960 KB
testcase_12 AC 157 ms
18,048 KB
testcase_13 AC 65 ms
10,496 KB
testcase_14 AC 70 ms
10,880 KB
testcase_15 AC 214 ms
22,400 KB
testcase_16 AC 20 ms
5,632 KB
testcase_17 AC 116 ms
13,056 KB
testcase_18 AC 210 ms
19,456 KB
testcase_19 AC 201 ms
19,584 KB
testcase_20 AC 92 ms
12,160 KB
testcase_21 AC 83 ms
11,392 KB
testcase_22 AC 185 ms
18,560 KB
testcase_23 AC 46 ms
8,192 KB
testcase_24 AC 154 ms
16,768 KB
testcase_25 AC 26 ms
6,144 KB
testcase_26 AC 53 ms
8,960 KB
testcase_27 AC 148 ms
16,256 KB
testcase_28 AC 85 ms
11,392 KB
testcase_29 AC 190 ms
18,944 KB
testcase_30 AC 23 ms
5,888 KB
testcase_31 AC 11 ms
5,376 KB
testcase_32 AC 32 ms
6,784 KB
testcase_33 AC 146 ms
16,000 KB
testcase_34 AC 12 ms
5,376 KB
testcase_35 AC 52 ms
8,576 KB
testcase_36 AC 62 ms
9,600 KB
testcase_37 AC 177 ms
17,920 KB
testcase_38 AC 118 ms
13,824 KB
testcase_39 AC 11 ms
5,376 KB
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 # 

//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,avx512f")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <iostream>
#include <iomanip>
#include <string>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
#include <map>
#include <unordered_map>
#include <unordered_set>
#include <list>
#include <stack>
#include <queue>
#include <bitset>
#include <numeric>
#include <cassert>
#include <memory>
#include <random>
#include <functional>
#include <complex>
#include <immintrin.h>
#include <stdexcept>
#ifdef DEBUG
#include "./CompetitiveProgrammingCpp/debug.hpp"
#include "./CompetitiveProgrammingCpp/Timer.hpp"
#include "./CompetitiveProgrammingCpp/sample.hpp"
#else
#define dump(...)
template<class T>constexpr inline auto d_val(T a, T b) { return a; }
#endif

/* macro */
#define FOR(i, b, e) for(ll i = (ll)(b); i < (ll)(e); ++i)
#define RFOR(i, b, e) for(ll i = (ll)((e)-1); i >= (ll)(b); --i)
#define REP(i, n) FOR(i, 0, (n))
#define RREP(i, n) RFOR(i, 0, (n))
#define REPC(x,c) for(const auto& x:(c))
#define REPI2(it,b,e) for(auto it = (b); it != (e); ++it)
#define REPI(it,c) REPI2(it, (c).begin(), (c).end())
#define RREPI(it,c) REPI2(it, (c).rbegin(), (c).rend())
#define REPI_ERACE2(it, b, e) for(auto it = (b); it != (e);)
#define REPI_ERACE(it, c) REPI_ERACE2(it, (c).begin(), (c).end())
#define ALL(x) (x).begin(),(x).end()
#define cauto const auto&
/* macro func */
template<class T>
inline auto sort(T& t) { std::sort(ALL(t)); }
template<class T>
inline auto rsort(T& t) { std::sort((t).rbegin(), (t).rend()); }
template<class T>
inline auto unique(T& t) { (t).erase(unique((t).begin(), (t).end()), (t).end()); }
template<class T, class S>
inline auto chmax(T& t, const S& s) { if(s > t) { t = s; return true; } return false; }
template<class T, class S>
inline auto chmin(T& t, const S& s) { if(s < t) { t = s; return true; } return false; }
inline auto BR() { std::cout << "\n"; }

/* type define */
using ll = long long;
using VS = std::vector<std::string>;
using VL = std::vector<long long>;
using VVL = std::vector<VL>;
using VVVL = std::vector<VVL>;
using VVVVL = std::vector<VVVL>;
using VVVVVL = std::vector<VVVVL>;
using VD = std::vector<double>;
template<class T>
using V = std::vector<T>;
template<class T = ll, class U = T>
using P = std::pair<T, U>;
using PAIR = P<ll>;

/* using std */
using std::cout;
constexpr char endl = '\n';
using std::cin;
using std::pair;
using std::string;
using std::stack;
using std::queue;
using std::deque;
using std::vector;
using std::list;
using std::map;
using std::unordered_map;
using std::multimap;
using std::unordered_multimap;
using std::set;
using std::unordered_set;
using std::unordered_multiset;
using std::multiset;
using std::bitset;
using std::priority_queue;

/* Initial processing  */
struct Preprocessing { Preprocessing() { std::cin.tie(0); std::ios::sync_with_stdio(0); }; }_Preprocessing;

/* Remove the source of the bug */
auto pow(signed, signed) { assert(false); }

/* define hash */
namespace std {
template <>	class hash<std::pair<ll, ll>> { public:	size_t operator()(const std::pair<ll, ll>& x) const { return hash<ll>()(1000000000 * x.first + x.second); } };
}

/* input */
template<class T> std::istream& operator >> (std::istream& is, vector<T>& vec) { for(T& x : vec) is >> x; return is; }

/* constant value */
// constexpr ll MOD = 1000000007;
constexpr ll MOD = 998244353;

//=============================================================================================


signed main() {

    ll n, m;
    cin >> n >> m;

    multimap<ll, ll> v;
    REP(_, m) {
        ll a, b;
        cin >> a >> b;
        v.emplace(a, b);
    }

    VL itox;
    itox.reserve(2 * m);
    for(const auto& [a, b] : v) {
        itox.emplace_back(a);
        itox.emplace_back(b);
    }
    sort(itox);
    unique(itox);

    ll sz = itox.size();
    map<ll, ll> xtoi;
    REP(i, sz) { xtoi.emplace(itox[i], i); }

    VL dp(sz, 1e18);
    dp[0] = 2 * (itox[0] - 1);
    REP(i, sz) {
        if(i > 0) { chmin(dp[i], dp[i - 1] + 2 * (itox[i] - itox[i - 1])); }
        ll from = itox[i];
        auto range = v.equal_range(from);
        REPI2(itr, range.first, range.second) {
            auto to = itr->second;
            chmin(dp[xtoi[to]], dp[xtoi[from]] + 2 * (to - from) - 1);
        }
    }
    ll ans = 2 * (n - 1);
    REP(i, sz) {
        chmin(ans, dp[i] + 2 * (n - itox[i]));
    }

    dump(dp);

    cout << ans << endl;
}
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