結果
問題 | No.2411 Reverse Directions |
ユーザー |
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提出日時 | 2023-08-11 22:06:20 |
言語 | C++17 (gcc 13.3.0 + boost 1.87.0) |
結果 |
AC
|
実行時間 | 15 ms / 2,000 ms |
コード長 | 3,030 bytes |
コンパイル時間 | 2,176 ms |
コンパイル使用メモリ | 223,964 KB |
最終ジャッジ日時 | 2025-02-16 01:27:03 |
ジャッジサーバーID (参考情報) |
judge4 / judge1 |
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ファイルパターン | 結果 |
---|---|
sample | AC * 3 |
other | AC * 29 |
ソースコード
#include<bits/stdc++.h>namespace {#pragma GCC diagnostic ignored "-Wunused-function"#include<atcoder/all>#pragma GCC diagnostic warning "-Wunused-function"using namespace std;using namespace atcoder;#define rep(i,n) for(int i = 0; i < (int)(n); i++)#define rrep(i,n) for(int i = (int)(n) - 1; i >= 0; i--)#define all(x) begin(x), end(x)#define rall(x) rbegin(x), rend(x)template<class T> bool chmax(T& a, const T& b) { if (a < b) { a = b; return true; } else return false; }template<class T> bool chmin(T& a, const T& b) { if (b < a) { a = b; return true; } else return false; }using ll = long long;using P = pair<int,int>;using VI = vector<int>;using VVI = vector<VI>;using VL = vector<ll>;using VVL = vector<VL>;const int di[] = {1, 0, -1, 0};const int dj[] = {0, 1, 0, -1};} int main() {ios::sync_with_stdio(false);cin.tie(0);int n, m, k, l, r;cin >> n >> m >> k >> l >> r;l--;vector<string> s(n);rep(i, n) cin >> s[i];constexpr int INF = 1001001001;auto idxchk = [&](int i, int j) { return 0 <= i && i < n && 0 <= j && j < m; };auto bfs = [&](int si, int sj) {VVI dist(n, VI(m, INF));queue<P> q;auto add = [&](int i, int j, int d) {if (dist[i][j] == INF) {dist[i][j] = d;q.emplace(i, j);}};add(si, sj, 0);while(q.size()) {auto [i, j] = q.front(); q.pop();rep(k, 4) {int ni = i + di[k], nj = j + dj[k];if (!idxchk(ni, nj)) continue;if (s[ni][nj] == '#') continue;add(ni, nj, dist[i][j] + 1);}}return dist;};int c0 = l, c1 = k - r;VVI d0 = bfs(0, 0), d1 = bfs(n - 1, m - 1);rep(i, n) rep(j, m) {int r0 = c0 - d0[i][j];int r1 = c1 - d1[i][j];if (r0 < 0 || r1 < 0 || r0 % 2 || r1 % 2 || (r - l) % 2) continue;bool ok = false;if (idxchk(i-1, j) && idxchk(i+1, j) && s[i-1][j] == '.' && s[i+1][j] == '.') ok = true;else if (idxchk(i, j-1) && idxchk(i, j+1) && s[i][j-1] == '.' && s[i][j+1] == '.') ok = true;if (ok) {cout << "Yes\n";string ans;int x = i, y = j;while(d0[x][y]) {rep(k, 4) {int nx = x + di[k], ny = y + dj[k];if (!idxchk(nx, ny)) continue;if (d0[nx][ny] == d0[x][y] - 1) {ans += "ULDR"[k];x = nx, y = ny;break;}}}reverse(all(ans));int cnt = (r0 + r1 + (r - l)) / 2;if (idxchk(i-1, j) && idxchk(i+1, j) && s[i-1][j] == '.' && s[i+1][j] == '.') {rrep(_, cnt) ans += 'U', ans += 'D';} else {rrep(_, cnt) ans += 'L', ans += 'R';}x = i, y = j;while(d1[x][y]) {rep(k, 4) {int nx = x + di[k], ny = y + dj[k];if (!idxchk(nx, ny)) continue;if (d1[nx][ny] == d1[x][y] - 1) {ans += "DRUL"[k];x = nx, y = ny;break;}}}cout << ans << '\n';return 0;}}cout << "No\n";}