結果
問題 | No.124 門松列(3) |
ユーザー |
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提出日時 | 2020-11-23 07:23:36 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 94 ms / 5,000 ms |
コード長 | 2,502 bytes |
コンパイル時間 | 2,677 ms |
コンパイル使用メモリ | 212,976 KB |
最終ジャッジ日時 | 2025-01-16 04:50:32 |
ジャッジサーバーID (参考情報) |
judge5 / judge4 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 4 |
other | AC * 26 |
ソースコード
#include <bits/stdc++.h>using namespace std;template <typename T, typename U> bool cmin(T &a, U b) { return a > b && (a = b, true); }template <typename T, typename U> bool cmax(T &a, U b) { return a < b && (a = b, true); }template <typename T> class Dijkstra {private:struct edge {int to;T cost;};vector<vector<edge>> G;vector<T> D;public:Dijkstra(int n) : G(n), D(n, numeric_limits<T>::max()) {}void add(int from, int to, T cost) { G.at(from).push_back((edge){to, cost}); }vector<T> solve(int start) {using pti = pair<T, int>;priority_queue<pti, vector<pti>, greater<pti>> Q;D.at(start) = 0;Q.push(pti(0, start));while (Q.size()) {auto [dist, now] = Q.top();Q.pop();if (D.at(now) < dist) continue;for (auto [next, cost] : G.at(now)) {if (D.at(next) > D.at(now) + cost) {D.at(next) = D.at(now) + cost;Q.push(pti(D.at(next), next));}}}return D;}void reset() { fill(D.begin(), D.end(), numeric_limits<T>::max()); }};signed main() {cin.tie(nullptr);ios_base::sync_with_stdio(false);int W, H;cin >> W >> H;vector<vector<char>> S(H, vector<char>(W));for (int i = 0; i < H; i++) {for (int j = 0; j < W; j++) {cin >> S.at(i).at(j);}}Dijkstra<long> D(H * W * 10);auto id = [&](int h, int w) { return W * h + w; };auto iskd = [&](int a, int b, int c) {if (a == b || b == c || c == a) return false;if (b == max({a, b, c})) return true;if (b == min({a, b, c})) return true;return false;};vector<int> mh{-1, 0, 1, 0};vector<int> mw{0, 1, 0, -1};for (int h = 0; h < H; h++) {for (int w = 0; w < W; w++) {for (int i = 0; i < 4; i++) {int nh = h + mh.at(i);int nw = w + mw.at(i);if (nh < 0 || nh >= H || nw < 0 || nw >= W) continue;for (int a = 1; a <= 9; a++) {int b = S.at(h).at(w) - '0';int c = S.at(nh).at(nw) - '0';if (iskd(a, b, c))D.add(H * W * a + id(h, w), H * W * b + id(nh, nw), 1);else if (!h && !w)D.add(H * W * a + id(h, w), H * W * b + id(nh, nw), 1);}}}}int ans = INT_MAX;for (int i = 1; i <= 9; i++) {auto tmp = D;auto V = tmp.solve(H * W * i);for (int j = 1; j <= 9; j++) {cmin(ans, V.at(H * W * j + id(H - 1, W - 1)));}}if (ans == INT_MAX) ans = -1;cout << ans << "\n";}