結果

問題 No.1995 CHIKA Road
ユーザー ___Johniel___Johniel
提出日時 2022-07-06 04:44:46
言語 C++14
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 802 ms / 2,000 ms
コード長 3,221 bytes
コンパイル時間 2,227 ms
コンパイル使用メモリ 189,256 KB
実行使用メモリ 35,168 KB
最終ジャッジ日時 2023-08-22 19:40:51
合計ジャッジ時間 14,789 ms
ジャッジサーバーID
(参考情報)
judge13 / judge11
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 1 ms
4,380 KB
testcase_01 AC 1 ms
4,384 KB
testcase_02 AC 2 ms
4,380 KB
testcase_03 AC 1 ms
4,380 KB
testcase_04 AC 2 ms
4,380 KB
testcase_05 AC 2 ms
4,380 KB
testcase_06 AC 24 ms
5,220 KB
testcase_07 AC 104 ms
9,280 KB
testcase_08 AC 2 ms
4,384 KB
testcase_09 AC 2 ms
4,380 KB
testcase_10 AC 77 ms
6,228 KB
testcase_11 AC 802 ms
35,168 KB
testcase_12 AC 324 ms
18,920 KB
testcase_13 AC 187 ms
13,700 KB
testcase_14 AC 210 ms
14,412 KB
testcase_15 AC 696 ms
31,524 KB
testcase_16 AC 44 ms
6,544 KB
testcase_17 AC 250 ms
15,624 KB
testcase_18 AC 499 ms
23,776 KB
testcase_19 AC 510 ms
23,576 KB
testcase_20 AC 219 ms
14,328 KB
testcase_21 AC 200 ms
13,416 KB
testcase_22 AC 467 ms
22,448 KB
testcase_23 AC 105 ms
9,548 KB
testcase_24 AC 393 ms
19,940 KB
testcase_25 AC 53 ms
6,768 KB
testcase_26 AC 126 ms
10,520 KB
testcase_27 AC 369 ms
19,404 KB
testcase_28 AC 202 ms
13,372 KB
testcase_29 AC 489 ms
22,996 KB
testcase_30 AC 53 ms
6,844 KB
testcase_31 AC 23 ms
5,140 KB
testcase_32 AC 70 ms
7,816 KB
testcase_33 AC 361 ms
19,288 KB
testcase_34 AC 26 ms
5,424 KB
testcase_35 AC 114 ms
10,148 KB
testcase_36 AC 138 ms
11,116 KB
testcase_37 AC 425 ms
21,184 KB
testcase_38 AC 280 ms
16,928 KB
testcase_39 AC 21 ms
4,984 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 #

// yukicoder/1995/main.cpp
// author: @___Johniel
// github: https://github.com/johniel/

#include <bits/stdc++.h>

#define each(i, c) for (auto& i : c)
#define unless(cond) if (!(cond))
// #define endl "\n"

using namespace std;

template<typename P, typename Q> ostream& operator << (ostream& os, pair<P, Q> p) { os << "(" << p.first << "," << p.second << ")"; return os; }
template<typename P, typename Q> istream& operator >> (istream& is, pair<P, Q>& p) { is >> p.first >> p.second; return is; }
template<typename T> ostream& operator << (ostream& os, vector<T> v) { os << "("; for (auto& i: v) os << i << ","; os << ")"; return os; }
template<typename T> istream& operator >> (istream& is, vector<T>& v) { for (auto& i: v) is >> i; return is; }
template<typename T> ostream& operator << (ostream& os, set<T> s) { os << "#{"; for (auto& i: s) os << i << ","; os << "}"; return os; }
template<typename K, typename V> ostream& operator << (ostream& os, map<K, V> m) { os << "{"; for (auto& i: m) os << i << ","; os << "}"; return os; }
template<typename E, size_t N> istream& operator >> (istream& is, array<E, N>& a) { for (auto& i: a) is >> i; return is; }
template<typename E, size_t N> ostream& operator << (ostream& os, array<E, N>& a) { os << "[]{"; for (auto& i: a) os << i << ","; os << "}"; return os; }

template<typename T> inline T setmax(T& a, T b) { return a = std::max(a, b); }
template<typename T> inline T setmin(T& a, T b) { return a = std::min(a, b); }

using lli = long long int;
using ull = unsigned long long;
using point = complex<double>;
using str = string;
template<typename T> using vec = vector<T>;

constexpr array<int, 8> di({0, 1, -1, 0, 1, -1, 1, -1});
constexpr array<int, 8> dj({1, 0, 0, -1, 1, -1, -1, 1});
constexpr lli mod = 1e9 + 7;
// constexpr lli mod = 998244353;

int main(int argc, char *argv[])
{
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.setf(ios_base::fixed);
  cout.precision(15);

  int n, m;
  while (cin >> n >> m) {
    vec<pair<int, int>> v(m);
    cin >> v;

    map<int, int> idx;
    int cnt = 0;
    idx[1] = cnt++;
    idx[n] = cnt++;
    each (i, v) {
      unless (idx.count(i.first)) idx[i.first] = cnt++;
      unless (idx.count(i.second)) idx[i.second] = cnt++;
    }

    const int N = cnt;
    vec<pair<int, int>> g[N];
    each (i, v) {
      int a = idx[i.first];
      int b = idx[i.second];
      int c = 2 * (i.second - i.first) - 1;
      g[a].push_back({b, c});
    }
    vec<int> u;
    each (i, idx) u.push_back(i.first);
    sort(u.begin(), u.end());
    for (int i = 0; i + 1 < u.size(); ++i) {
      int a = idx[u[i]];
      int b = idx[u[i + 1]];
      int c = (u[i + 1] - u[i]) * 2;
      g[a].push_back({b, c});
    }

    map<int, int> cost;
    each (i, idx) cost[i.second] = n * 2;

    priority_queue<pair<int, int>> q;
    q.push({0, idx[1]});
    cost[idx[1]] = 0;
    while (q.size()) {
      auto p = q.top();
      q.pop();
      if (cost[p.second] != abs(p.first)) continue;
      each (e, g[p.second]) {
        int c = abs(p.first) + e.second;
        if (cost[e.first] > c) {
          cost[e.first] = c;
          q.push({-c, e.first});
        }
      }
    }
    cout << cost[idx[n]] << endl;
  }

  return 0;
}
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