Submission #387970

#	Time	Username	Problem	Language	Result	Execution time	Memory
387970		Hegdahl	Robot (JOI21_ho_t4)	C++17	0 / 100	231 ms	27424 KiB

Main

#pragma GCC optimize("Ofast")
#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

#ifdef ENABLE_DEBUG
#include <debug.h>
#else
#define DEBUG(...) do {} while (0)
#endif

using namespace std;
using namespace __gnu_pbds;

using ll = long long;
using ull = unsigned long long;
using lll = __int128;
using ulll = unsigned __int128;

using ld = long double;

template<typename T, size_t N> using ar = array<T, N>;

template<typename T, typename Cmp = less<T>>
using iset = tree<T, null_type, Cmp, rb_tree_tag,
		  tree_order_statistics_node_update, allocator<T>>;

#define REPSI(name, start, stop, step) for (ll name = start; name < (ll)stop; name += step)
#define REPS(name, start, stop) REPSI(name, start, stop, 1)
#define REP(name, stop) REPS(name, 0, stop)

#define RREPSI(name, start, stop, step) for (ll name = stop-1; name >= (ll)start; name -= step)
#define RREPS(name, start, stop) RREPSI(name, start, stop, 1)
#define RREP(name, stop) RREPS(name, 0, stop)

template<typename T> void cins(T &first) { cin >> first; }
template<typename T, typename... Ts> void cins(T &first, T &second, Ts&... rest) {
  cin >> first;
  cins(second, rest...);
}

#define GET(type, ...) type __VA_ARGS__; cins(__VA_ARGS__)
#define GETI(...) GET(int, __VA_ARGS__)
#define GETLL(...) GET(ll, __VA_ARGS__)
#define GETS(...) GET(string, __VA_ARGS__)
#define GETD(...) GET(double, __VA_ARGS__)
#define GETC(...) GET(char, __VA_ARGS__)

struct hsh {
  size_t operator()(uint64_t x) const {
    static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
    x += FIXED_RANDOM;
    x += 0x9e3779b97f4a7c15;
    x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
    x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
    return x ^ (x >> 31);
  }
};

const int mxN = 1e5;

vector<ar<ll, 4>> g[mxN];

vector<ll> dist[mxN];

map<ll, ll> ccnt[mxN];

int main() {
  ios::sync_with_stdio(0);cin.tie(0);

  GETI(n, m);
  REP(mm, m) {
    GETI(i, j, c, p); --i, --j;

    ll oi = g[i].size();
    ll oj = g[j].size();

    g[i].push_back({j, c, p, oj});
    g[j].push_back({i, c, p, oi});
    ++ccnt[i][c];
    ++ccnt[j][c];
  }

  REP(i, n) DEBUG(ccnt[i]);

  REP(i, n) dist[i].resize(g[i].size()+1, -1);

  // cost, i, j
  priority_queue<ar<ll, 3>, vector<ar<ll, 3>>, greater<ar<ll, 3>>> pq;
  
  pq.push({0, 0, g[0].size()});

  while (pq.size()) {
    auto [cost, i, j] = pq.top();
    pq.pop();
    
    if (dist[i][j] != -1) continue;
    dist[i][j] = cost;

    DEBUG(ar<ll, 2>{i, j});
    DEBUG(cost);

    int changed = -1;
    if (j < g[i].size()) changed = g[i][j][1];

    REP(k, g[i].size()) {
      if (k == j) continue;

      auto [nxt, color, w, nj] = g[i][k];
      
      ll cnt = ccnt[i][color];
      if (color == changed) --cnt;

      if (cnt == 1 && dist[nxt][g[nxt].size()] == -1)
        pq.push({cost, nxt, g[nxt].size()});

      if (dist[k][nj] == -1)
        pq.push({cost+w, nxt, nj});
    }
  }

  REP(i, n) DEBUG(dist[i]);

  ll ans = 1LL<<60;
  for (ll x : dist[n-1]) if (x != -1) ans = min(ans, x);

  if (ans == (1LL<<60)) ans = -1;
  cout << ans << '\n';
}

Compilation message (stderr)

Main.cpp: In function 'int main()':
Main.cpp:92:27: warning: narrowing conversion of 'g[0].std::vector<std::array<long long int, 4> >::size()' from 'std::vector<std::array<long long int, 4> >::size_type' {aka 'long unsigned int'} to 'long long int' [-Wnarrowing]
   92 |   pq.push({0, 0, g[0].size()});
      |                  ~~~~~~~~~^~
Main.cpp:105:11: warning: comparison of integer expressions of different signedness: 'std::tuple_element<2, std::array<long long int, 3> >::type' {aka 'long long int'} and 'std::vector<std::array<long long int, 4> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  105 |     if (j < g[i].size()) changed = g[i][j][1];
      |         ~~^~~~~~~~~~~~~
Main.cpp:116:40: warning: narrowing conversion of 'g[nxt].std::vector<std::array<long long int, 4> >::size()' from 'std::vector<std::array<long long int, 4> >::size_type' {aka 'long unsigned int'} to 'long long int' [-Wnarrowing]
  116 |         pq.push({cost, nxt, g[nxt].size()});
      |                             ~~~~~~~~~~~^~

• Subtask 1: 0 / 34
• Subtask 2: 0 / 24
• Subtask 3: 0 / 42