結果

問題 No.2411 Reverse Directions
ユーザー だれだれ
提出日時 2023-08-11 22:20:23
言語 C++17
(gcc 12.3.0 + boost 1.83.0)
結果
AC  
実行時間 35 ms / 2,000 ms
コード長 9,884 bytes
コンパイル時間 4,255 ms
コンパイル使用メモリ 212,320 KB
実行使用メモリ 16,044 KB
最終ジャッジ日時 2024-11-18 16:49:33
合計ジャッジ時間 6,390 ms
ジャッジサーバーID
（参考情報） 		judge2 / judge4
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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 13 ms
7,936 KB
testcase_01 AC 14 ms
8,064 KB
testcase_02 AC 13 ms
7,936 KB
testcase_03 AC 13 ms
7,976 KB
testcase_04 AC 15 ms
9,124 KB
testcase_05 AC 14 ms
7,936 KB
testcase_06 AC 14 ms
8,064 KB
testcase_07 AC 20 ms
15,156 KB
testcase_08 AC 14 ms
7,936 KB
testcase_09 AC 14 ms
8,064 KB
testcase_10 AC 30 ms
16,044 KB
testcase_11 AC 14 ms
7,936 KB
testcase_12 AC 35 ms
13,312 KB
testcase_13 AC 13 ms
7,940 KB
testcase_14 AC 19 ms
9,472 KB
testcase_15 AC 14 ms
8,288 KB
testcase_16 AC 15 ms
8,320 KB
testcase_17 AC 19 ms
9,716 KB
testcase_18 AC 14 ms
8,488 KB
testcase_19 AC 13 ms
7,988 KB
testcase_20 AC 18 ms
9,380 KB
testcase_21 AC 19 ms
10,660 KB
testcase_22 AC 29 ms
12,032 KB
testcase_23 AC 14 ms
7,936 KB
testcase_24 AC 34 ms
13,312 KB
testcase_25 AC 14 ms
7,808 KB
testcase_26 AC 14 ms
8,300 KB
testcase_27 AC 19 ms
8,960 KB
testcase_28 AC 23 ms
10,712 KB
testcase_29 AC 34 ms
13,312 KB
testcase_30 AC 26 ms
11,264 KB
testcase_31 AC 29 ms
11,520 KB
権限があれば一括ダウンロードができます

ソースコード

diff # 

#include <algorithm>
#include <bitset>
#include <cassert>
#include <cmath>
#include <complex>
#include <cstdio>
#include <fstream>
#include <functional>
#include <iomanip>
#include <iostream>
#include <iterator>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <sstream>
#include <stack>
#include <unordered_set>
using namespace std;
#if __has_include(<atcoder/all>)
#include <atcoder/all>
#endif
#define GET_MACRO(_1, _2, _3, NAME, ...) NAME
#define _rep(i, n) _rep2(i, 0, n)
#define _rep2(i, a, b) for (int i = (int)(a); i < (int)(b); i++)
#define rep(...) GET_MACRO(__VA_ARGS__, _rep2, _rep)(__VA_ARGS__)
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define UNIQUE(x)                      \
    std::sort((x).begin(), (x).end()); \
    (x).erase(std::unique((x).begin(), (x).end()), (x).end())
using i64 = long long;
template <class T, class U>
bool chmin(T& a, const U& b) {
    return (b < a) ? (a = b, true) : false;
}
template <class T, class U>
bool chmax(T& a, const U& b) {
    return (b > a) ? (a = b, true) : false;
}
inline void YesNo(bool f = 0, string yes = "Yes", string no = "No") {
    std::cout << (f ? yes : no) << "\n";
}
namespace io {
template <typename T>
istream& operator>>(istream& i, vector<T>& v) {
    rep(j, v.size()) i >> v[j];
    return i;
}
template <typename T>
string join(vector<T>& v) {
    stringstream s;
    rep(i, v.size()) s << ' ' << v[i];
    return s.str().substr(1);
}
template <typename T>
ostream& operator<<(ostream& o, vector<T>& v) {
    if (v.size()) o << join(v);
    return o;
}
template <typename T>
string join(vector<vector<T>>& vv) {
    string s = "\n";
    rep(i, vv.size()) s += join(vv[i]) + "\n";
    return s;
}
template <typename T>
ostream& operator<<(ostream& o, vector<vector<T>>& vv) {
    if (vv.size()) o << join(vv);
    return o;
}

template <class T, class U>
istream& operator>>(istream& i, pair<T, U>& p) {
    i >> p.first >> p.second;
    return i;
}

template <class T, class U>
ostream& operator<<(ostream& o, pair<T, U>& p) {
    o << p.first << " " << p.second;
    return o;
}

void print() { cout << "\n"; }

template <class Head, class... Tail>
void print(Head&& head, Tail&&... tail) {
    cout << head;
    if (sizeof...(tail)) cout << ' ';
    print(std::forward<Tail>(tail)...);
}

void in() {}

template <class Head, class... Tail>
void in(Head&& head, Tail&&... tail) {
    cin >> head;
    in(std::forward<Tail>(tail)...);
}

}  // namespace io
using namespace io;

namespace useful {
long long modpow(long long a, long long b, long long mod) {
    long long res = 1;
    while (b) {
        if (b & 1) res *= a, res %= mod;
        a *= a;
        a %= mod;
        b >>= 1;
    }
    return res;
}

bool is_pow2(long long x) { return x > 0 && (x & (x - 1)) == 0; }

template <class T>
void rearrange(vector<T>& a, vector<int>& p) {
    vector<T> b = a;
    for (int i = 0; i < int(a.size()); i++) {
        a[i] = b[p[i]];
    }
    return;
}

template <class T>
vector<pair<int, int>> rle_sequence(T& a) {
    vector<pair<int, int>> res;
    int n = a.size();
    if (n == 1) return vector<pair<int, int>>{{a[0], 1}};
    int l = 1;
    rep(i, n - 1) {
        if (a[i] == a[i + 1])
            l++;
        else {
            res.emplace_back(a[i], l);
            l = 1;
        }
    }
    res.emplace_back(a.back(), l);
    return res;
}

vector<pair<char, int>> rle_string(string a) {
    vector<pair<char, int>> res;
    int n = a.size();
    if (n == 1) return vector<pair<char, int>>{{a[0], 1}};
    int l = 1;
    rep(i, n - 1) {
        if (a[i] == a[i + 1])
            l++;
        else {
            res.emplace_back(a[i], l);
            l = 1;
        }
    }
    res.emplace_back(a.back(), l);
    return res;
}

vector<int> linear_sieve(int n) {
    vector<int> primes;
    vector<int> res(n + 1);
    iota(all(res), 0);
    for (int i = 2; i <= n; i++) {
        if (res[i] == i) primes.emplace_back(i);
        for (auto j : primes) {
            if (j * i > n) break;
            res[j * i] = j;
        }
    }
    return res;
    // return primes;
}

template <class T>
vector<long long> dijkstra(vector<vector<pair<int, T>>>& graph, int start) {
    int n = graph.size();
    vector<long long> res(n, 2e18);
    res[start] = 0;
    priority_queue<pair<long long, int>, vector<pair<long long, int>>,
                   greater<pair<long long, int>>>
        que;
    que.push({0, start});
    while (!que.empty()) {
        auto [c, v] = que.top();
        que.pop();
        if (res[v] < c) continue;
        for (auto [nxt, cost] : graph[v]) {
            auto x = c + cost;
            if (x < res[nxt]) {
                res[nxt] = x;
                que.push({x, nxt});
            }
        }
    }
    return res;
}

}  // namespace useful
using namespace useful;

using mint = atcoder::modint998244353;

vector<mint> fact_calc(int x) {
    vector<mint> res(x + 1);
    res[0] = 1;
    for (int i = 0; i < x; i++) {
        res[i + 1] = res[i] * (i + 1);
    }
    return res;
}

vector<mint> ifact_calc(int x) {
    vector<mint> res(x + 1);
    mint t = 1;
    for (int i = 1; i <= x; i++) {
        t *= i;
    }
    // res[x] = t.inverse();
    res[x] = t.inv();
    for (int i = x; i > 0; i--) {
        res[i - 1] = res[i] * i;
    }
    return res;
}

auto fact = fact_calc(600005);
auto ifact = ifact_calc(600005);

mint comb(int x, int y) {
    if (x < 0 || y < 0 || x - y < 0) return 0;
    return fact[x] * ifact[y] * ifact[x - y];
}

mint perm(int x, int y) {
    if (x < 0 || x - y < 0) return 0;
    return fact[x] * ifact[x - y];
}

int h, w;

bool check(int i, int j) { return 0 <= i && i < h && 0 <= j && j < w; }

vector<int> di = {1, -1, 0, 0};
vector<int> dj = {0, 0, -1, 1};

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    int k, l, r;
    in(h, w, k, l, r);
    if ((r - l + 1) & 1) {
        print("No");
        return 0;
    }
    vector<string> s(h);
    in(s);
    vector isok(h, vector<int>(w));
    rep(i, h) rep(j, w) {
        if (s[i][j] == '#') continue;
        int f = 0;
        if (i + 1 < h && i - 1 >= 0) {
            if (s[i - 1][j] == '.' && s[i + 1][j] == '.') f = 1;
        }
        if (j + 1 < w && j - 1 >= 0) {
            if (s[i][j - 1] == '.' && s[i][j + 1] == '.') f = 2;
        }
        isok[i][j] = f;
    }
    vector dist(h, vector<int>(w, 1e9));
    vector huku(h, vector<pair<int, int>>(w, pair{-1, -1}));
    vector distrev(h, vector<int>(w, 1e9));
    vector hukurev(h, vector<pair<int, int>>(w, pair{-1, -1}));
    queue<pair<int, int>> que;
    que.emplace(0, 0);
    dist[0][0] = 0;
    while (que.size()) {
        auto [i, j] = que.front();
        que.pop();
        rep(x, 4) {
            auto ni = i + di[x], nj = j + dj[x];
            if (check(ni, nj)) {
                if (s[ni][nj] == '#') continue;
                if (chmin(dist[ni][nj], dist[i][j] + 1)) {
                    huku[ni][nj] = {i, j};
                    que.emplace(ni, nj);
                }
            }
        }
    }
    que.emplace(h - 1, w - 1);
    distrev[h - 1][w - 1] = 0;
    while (que.size()) {
        auto [i, j] = que.front();
        que.pop();
        rep(x, 4) {
            auto ni = i + di[x], nj = j + dj[x];
            if (check(ni, nj)) {
                if (s[ni][nj] == '#') continue;
                if (chmin(distrev[ni][nj], distrev[i][j] + 1)) {
                    hukurev[ni][nj] = {i, j};
                    que.emplace(ni, nj);
                }
            }
        }
    }
    rep(i, h) rep(j, w) {
        if (isok[i][j] > 0) {
            auto fr = dist[i][j], bk = distrev[i][j];
            bool f = true;
            if (fr > l - 1) f = false;
            if (((l - 1) - fr) & 1) f = false;
            if (bk > k - r) f = false;
            if ((k - r - bk) & 1) f = false;
            if (f) {
                print("Yes");
                string ans;
                auto ni = i, nj = j;
                while (dist[ni][nj] > 0) {
                    if (ni > 0 && dist[ni - 1][nj] == dist[ni][nj] - 1) {
                        ans += 'D';
                        ni--;
                    } else if (ni + 1 < h &&
                               dist[ni + 1][nj] == dist[ni][nj] - 1) {
                        ans += 'U';
                        ni++;
                    } else if (nj > 0 && dist[ni][nj - 1] == dist[ni][nj] - 1) {
                        ans += 'R';
                        nj--;
                    } else {
                        ans += 'L';
                        nj++;
                    }
                }
                reverse(all(ans));
                rep(_,
                    ((l - 1) - fr) / 2 + (k - r - bk) / 2 + (r - l + 1) / 2) {
                    if (isok[i][j] == 1) {
                        ans += 'U';
                        ans += 'D';
                    } else {
                        ans += 'L';
                        ans += 'R';
                    }
                }
                ni = i, nj = j;
                while (distrev[ni][nj] > 0) {
                    if (ni > 0 && distrev[ni - 1][nj] == distrev[ni][nj] - 1) {
                        ans += 'U';
                        ni--;
                    } else if (ni + 1 < h &&
                               distrev[ni + 1][nj] == distrev[ni][nj] - 1) {
                        ans += 'D';
                        ni++;
                    } else if (nj > 0 &&
                               distrev[ni][nj - 1] == distrev[ni][nj] - 1) {
                        ans += 'L';
                        nj--;
                    } else {
                        ans += 'R';
                        nj++;
                    }
                }
                print(ans);
                return 0;
            }
        }
    }
    print("No");
}
0