結果

問題 No.1607 Kth Maximum Card
ユーザー theory_and_metheory_and_me
提出日時 2021-07-16 23:28:46
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 1,350 ms / 3,500 ms
コード長 3,983 bytes
コンパイル時間 2,011 ms
コンパイル使用メモリ 215,236 KB
実行使用メモリ 25,784 KB
最終ジャッジ日時 2024-07-06 11:05:49
合計ジャッジ時間 16,065 ms
ジャッジサーバーID
(参考情報)
judge3 / judge5
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
6,812 KB
testcase_01 AC 2 ms
6,944 KB
testcase_02 AC 1 ms
6,940 KB
testcase_03 AC 2 ms
6,944 KB
testcase_04 AC 1 ms
6,940 KB
testcase_05 AC 2 ms
6,940 KB
testcase_06 AC 2 ms
6,940 KB
testcase_07 AC 1 ms
6,940 KB
testcase_08 AC 1,350 ms
25,044 KB
testcase_09 AC 950 ms
21,096 KB
testcase_10 AC 1,246 ms
25,248 KB
testcase_11 AC 223 ms
8,208 KB
testcase_12 AC 895 ms
20,340 KB
testcase_13 AC 108 ms
6,940 KB
testcase_14 AC 131 ms
7,804 KB
testcase_15 AC 634 ms
21,380 KB
testcase_16 AC 108 ms
7,244 KB
testcase_17 AC 34 ms
6,940 KB
testcase_18 AC 400 ms
16,132 KB
testcase_19 AC 234 ms
11,236 KB
testcase_20 AC 347 ms
13,328 KB
testcase_21 AC 372 ms
14,320 KB
testcase_22 AC 718 ms
23,592 KB
testcase_23 AC 774 ms
23,384 KB
testcase_24 AC 286 ms
10,640 KB
testcase_25 AC 163 ms
8,012 KB
testcase_26 AC 206 ms
8,924 KB
testcase_27 AC 300 ms
10,828 KB
testcase_28 AC 243 ms
9,512 KB
testcase_29 AC 577 ms
16,876 KB
testcase_30 AC 1,210 ms
25,784 KB
testcase_31 AC 556 ms
15,684 KB
testcase_32 AC 185 ms
18,448 KB
testcase_33 AC 192 ms
18,360 KB
testcase_34 AC 183 ms
18,476 KB
testcase_35 AC 193 ms
18,420 KB
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ソースコード

diff #

#include <bits/stdc++.h>
using namespace std;

#define REP(i,n) for(ll i=0;i<(ll)n;i++)
#define dump(x)  cerr << "Line " << __LINE__ << ": " <<  #x << " = " << (x) << "\n";
#define spa << " " <<
#define fi first
#define se second
#define ALL(a)  (a).begin(),(a).end()
#define ALLR(a)  (a).rbegin(),(a).rend()

using ld = long double;
using ll = long long;
using ull = unsigned long long;
using pii = pair<int, int>;
using pll = pair<ll, ll>;
using pdd = pair<ld, ld>;

template<typename T> using V = vector<T>;
template<typename T> using P = pair<T, T>;
template<typename T> vector<T> make_vec(size_t n, T a) { return vector<T>(n, a); }
template<typename... Ts> auto make_vec(size_t n, Ts... ts) { return vector<decltype(make_vec(ts...))>(n, make_vec(ts...)); }
template<class S, class T> ostream& operator << (ostream& os, const pair<S, T> v){os << "(" << v.first << ", " << v.second << ")"; return os;}
template<typename T> ostream& operator<<(ostream &os, const vector<T> &v) { for (auto &e : v) os << e << ' '; return os; }
template<class T> ostream& operator<<(ostream& os, const vector<vector<T>> &v){ for(auto &e : v){os << e << "\n";} return os;}
struct fast_ios { fast_ios(){ cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(20); }; } fast_ios_;

template <class T> void UNIQUE(vector<T> &x) {sort(ALL(x));x.erase(unique(ALL(x)), x.end());}
template<class T> bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T> bool chmin(T &a, const T &b) { if (a>b) { a=b; return 1; } return 0; }
void fail() { cout << -1 << '\n'; exit(0); }
inline int popcount(const int x) { return __builtin_popcount(x); }
inline int popcount(const ll x) { return __builtin_popcountll(x); }
template<typename T> void debug(vector<vector<T>>&v,ll h,ll w){for(ll i=0;i<h;i++)
{cerr<<v[i][0];for(ll j=1;j<w;j++)cerr spa v[i][j];cerr<<"\n";}};
template<typename T> void debug(vector<T>&v,ll n){if(n!=0)cerr<<v[0];
for(ll i=1;i<n;i++)cerr spa v[i];
cerr<<"\n";};

const ll INF = (1ll<<62);
// const ld EPS   = 1e-10;
// const ld PI    = acos(-1.0);
const ll mod = (int)1e9 + 7;
//const ll mod = 998244353;

template< typename T >
struct edge {
  int src, to;
  T cost;

  edge(int to, T cost) : src(-1), to(to), cost(cost) {}

  edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

  edge &operator=(const int &x) {
    to = x;
    return *this;
  }

  operator int() const { return to; }
};

template< typename T >
using Edges = vector< edge< T > >;
template< typename T >
using WeightedGraph = vector< Edges< T > >;
using UnWeightedGraph = vector< vector< int > >;
template< typename T >
using Matrix = vector< vector< T > >;

template< typename T >
vector< T > Dijkstra(WeightedGraph< T > &g, int s) {
  const auto INF = numeric_limits< T >::max();
  vector< T > dist(g.size(), INF);

  using Pi = pair< T, int >;
  priority_queue< Pi, vector< Pi >, greater< Pi > > que;
  dist[s] = 0;
  que.emplace(dist[s], s);
  while(!que.empty()) {
    T cost;
    int idx;
    tie(cost, idx) = que.top();
    que.pop();
    if(dist[idx] < cost) continue;
    for(auto &e : g[idx]) {
      auto next_cost = cost + e.cost;
      if(dist[e.to] <= next_cost) continue;
      dist[e.to] = next_cost;
      que.emplace(dist[e.to], e.to);
    }
  }
  return dist;
}

int main(){

    ll N, M, K;
    cin >> N >> M >> K;
    V<ll> v(M), u(M), c(M);
    REP(i, M) cin >> v[i] >> u[i] >> c[i], v[i]--, u[i]--;

    ll ng = -1;
    ll ok = 202020;

    while(ok-ng>1){
        ll md = (ok+ng)/2;
        WeightedGraph<ll> G(N);
        REP(i, M){
            if(c[i] > md){
                G[u[i]].emplace_back(v[i], 1);
                G[v[i]].emplace_back(u[i], 1);
            }else{
                G[u[i]].emplace_back(v[i], 0);
                G[v[i]].emplace_back(u[i], 0);
            }
        }

        auto dist = Dijkstra(G, 0);

        if(dist[N-1] <= K-1) ok = md;
        else ng = md;
    }

    cout << ok << endl;

    return 0;
}
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