結果
| 問題 | No.3111 Toll Optimization |
| コンテスト | |
| ユーザー |
|
| 提出日時 | 2025-09-21 19:21:41 |
| 言語 | C++23 (gcc 13.3.0 + boost 1.89.0) |
| 結果 |
AC
|
| 実行時間 | 152 ms / 5,000 ms |
| コード長 | 2,325 bytes |
| 記録 | |
| コンパイル時間 | 3,280 ms |
| コンパイル使用メモリ | 296,780 KB |
| 実行使用メモリ | 15,324 KB |
| 最終ジャッジ日時 | 2025-09-21 19:21:52 |
| 合計ジャッジ時間 | 9,095 ms |
|
ジャッジサーバーID (参考情報) |
judge1 / judge4 |
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| ファイルパターン | 結果 |
|---|---|
| sample | AC * 3 |
| other | AC * 70 |
ソースコード
#include <bits/stdc++.h>
[[nodiscard]] static inline constexpr std::vector<std::vector<std::pair<uint_least32_t, uint_least32_t>>> prepare(const uint_fast32_t N, const uint_fast32_t M, const std::vector<uint_least32_t>& C, const std::vector<std::pair<uint_least32_t, uint_least32_t>>& bridges) noexcept
{
std::vector<std::vector<std::pair<uint_least32_t, uint_least32_t>>> next_of(N + 1);
for (uint_fast32_t i = 0; i != M; ++i)
next_of[bridges[i].first].emplace_back(bridges[i].second, C[i]), next_of[bridges[i].second].emplace_back(bridges[i].first, C[i]);
return next_of;
}
[[nodiscard]] static inline int_fast64_t solve(const uint_fast32_t N, const uint_fast32_t K, const std::vector<std::vector<std::pair<uint_least32_t, uint_least32_t>>>& next_of) noexcept
{
std::vector<std::array<uint_least64_t, 4>> dist(N + 1, { UINT_LEAST64_MAX, UINT_LEAST64_MAX, UINT_LEAST64_MAX, UINT_LEAST64_MAX });
std::priority_queue<std::tuple<uint_least64_t, uint_least32_t, uint_least32_t>, std::vector<std::tuple<uint_least64_t, uint_least32_t, uint_least32_t>>, std::greater<std::tuple<uint_least64_t, uint_least32_t, uint_least32_t>>> pq;
for (uint_fast32_t i = 0; i <= K; ++i) dist[1][i] = 0, pq.emplace(0, i, 1);
while (!pq.empty())
{
const auto [cur_dist, used_ticket, cur_pos] = pq.top();
const auto& next = next_of[cur_pos];
pq.pop();
if (cur_dist != dist[cur_pos][used_ticket]) continue;
for (uint_fast32_t i = 0; i != next.size(); ++i)
{
if (dist[next[i].first][used_ticket] > cur_dist + next[i].second)
dist[next[i].first][used_ticket] = cur_dist + next[i].second, pq.emplace(cur_dist + next[i].second, used_ticket, next[i].first);
if (used_ticket < K && dist[next[i].first][used_ticket + 1] > cur_dist)
dist[next[i].first][used_ticket + 1] = cur_dist, pq.emplace(cur_dist, used_ticket + 1, next[i].first);
}
}
return dist[N][K];
}
int main()
{
std::cin.tie(nullptr);
std::ios::sync_with_stdio(false);
uint_fast32_t N, M, K;
std::cin >> N >> M >> K;
std::vector<uint_least32_t> C(M);
std::vector<std::pair<uint_least32_t, uint_least32_t>> bridges(M);
for (uint_fast32_t i = 0; i != M; ++i) std::cin >> C[i];
for (uint_fast32_t i = 0; i != M; ++i) std::cin >> bridges[i].first >> bridges[i].second;
std::cout << solve(N, K, prepare(N, M, C, bridges)) << '\n';
return 0;
}