結果
問題 | No.424 立体迷路 |
ユーザー | koba-e964 |
提出日時 | 2016-09-22 23:20:30 |
言語 | C++11 (gcc 11.4.0) |
結果 |
AC
|
実行時間 | 3 ms / 2,000 ms |
コード長 | 2,970 bytes |
コンパイル時間 | 741 ms |
コンパイル使用メモリ | 99,564 KB |
実行使用メモリ | 5,376 KB |
最終ジャッジ日時 | 2024-07-05 07:06:10 |
合計ジャッジ時間 | 1,421 ms |
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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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
5,248 KB |
testcase_01 | AC | 2 ms
5,376 KB |
testcase_02 | AC | 2 ms
5,376 KB |
testcase_03 | AC | 1 ms
5,376 KB |
testcase_04 | AC | 1 ms
5,376 KB |
testcase_05 | AC | 2 ms
5,376 KB |
testcase_06 | AC | 2 ms
5,376 KB |
testcase_07 | AC | 1 ms
5,376 KB |
testcase_08 | AC | 2 ms
5,376 KB |
testcase_09 | AC | 2 ms
5,376 KB |
testcase_10 | AC | 1 ms
5,376 KB |
testcase_11 | AC | 1 ms
5,376 KB |
testcase_12 | AC | 1 ms
5,376 KB |
testcase_13 | AC | 1 ms
5,376 KB |
testcase_14 | AC | 2 ms
5,376 KB |
testcase_15 | AC | 1 ms
5,376 KB |
testcase_16 | AC | 1 ms
5,376 KB |
testcase_17 | AC | 1 ms
5,376 KB |
testcase_18 | AC | 2 ms
5,376 KB |
testcase_19 | AC | 2 ms
5,376 KB |
testcase_20 | AC | 2 ms
5,376 KB |
testcase_21 | AC | 1 ms
5,376 KB |
testcase_22 | AC | 1 ms
5,376 KB |
testcase_23 | AC | 1 ms
5,376 KB |
testcase_24 | AC | 3 ms
5,376 KB |
testcase_25 | AC | 3 ms
5,376 KB |
ソースコード
#include <algorithm> #include <bitset> #include <cassert> #include <cctype> #include <cmath> #include <cstdio> #include <cstdlib> #include <cstring> #include <ctime> #include <deque> #include <functional> #include <iomanip> #include <iostream> #include <list> #include <map> #include <numeric> #include <queue> #include <set> #include <sstream> #include <stack> #include <string> #include <utility> #include <vector> #define REP(i,s,n) for(int i=(int)(s);i<(int)(n);i++) using namespace std; typedef long long int ll; typedef vector<int> VI; typedef vector<ll> VL; typedef pair<int, int> PI; const ll mod = 1e9 + 7; /** * Dijkstra's algorithm. * First, call add_edge() to add edges. * Second, call solve() to calculate the length of the shortest path from source to each vertex. * Header requirement: algorithm, queue, vector * Verified by AtCoder ARC026-C (http://arc026.contest.atcoder.jp/submissions/604231) */ const ll inf = 1e16; template<class Len = int> class Dijkstra { private: int n; std::vector<std::vector<std::pair<int, Len> > > edges; public: /** * n: the number of vertices */ Dijkstra(int n) : n(n), edges(n) {} /* * from: the source of edge to add * to: the target of edge to add * cost: the cost of edge to add */ void add_edge(int from, int to, Len cost) { edges[from].push_back(std::pair<int, Len>(to, cost)); } /* * This function returns an array consisting of the distances from vertex source. */ std::vector<Len> solve(int source) { typedef std::pair<Len, int> pi; std::vector<Len> d(n, inf); std::priority_queue<pi, std::vector<pi>, std::greater<pi> > que; que.push(pi(0, source)); while (!que.empty()) { pi p = que.top(); que.pop(); int idx = p.second; if (d[idx] <= p.first) { continue; } d[idx] = p.first; for(int j = 0; j < edges[idx].size(); ++j) { que.push(pi(p.first + edges[idx][j].second, edges[idx][j].first)); } } return d; } }; const int H = 51; string s[H]; int main(void){ int h, w; cin >> h >> w; int sx, sy, gx, gy; cin >> sx >> sy >> gx >> gy; sx--, sy--, gx--, gy--; REP(i, 0, h) { cin >> s[i]; } Dijkstra<ll> dijk(h * w); REP(i, 0, h) { REP(j, 0, w) { int dxy[5] = {1, 0, -1, 0, 1}; REP(d, 0, 4) { int nx = i + dxy[d]; int ny = j + dxy[d + 1]; if (nx < 0 || nx >= h || ny < 0 || ny >= w) { continue; } int diff = s[i][j] - s[nx][ny]; if (diff >= -1 && diff <= 1) { dijk.add_edge(i * w + j, nx * w + ny, 1); } } REP(d, 0, 4) { int nx = i + 2 * dxy[d]; int ny = j + 2 * dxy[d + 1]; if (nx < 0 || nx >= h || ny < 0 || ny >= w) { continue; } char midheight = s[(i + nx) / 2][(j + ny) / 2]; int diff = s[i][j] - s[nx][ny]; if (diff == 0 && midheight < s[i][j]) { dijk.add_edge(i * w + j, nx * w + ny, 1); } } } } ll res = dijk.solve(sx * w + sy)[gx * w + gy]; cout << (res == inf ? "NO" : "YES") << endl; }