結果

問題 No.5022 XOR Printer
コンテスト
ユーザー SnowBeenDiding
提出日時 2025-07-26 14:29:39
言語 C++23
(gcc 13.3.0 + boost 1.89.0)
結果
AC  
実行時間 2 ms / 2,000 ms
コード長 2,839 bytes
記録
記録タグの例:
初AC ショートコード 純ショートコード 純主流ショートコード 最速実行時間
コンパイル時間 5,222 ms
コンパイル使用メモリ 335,416 KB
実行使用メモリ 7,720 KB
スコア 5,079,781,329
最終ジャッジ日時 2025-07-26 14:29:47
合計ジャッジ時間 7,274 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge3
純コード判定しない問題か言語
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ファイルパターン 結果
other AC * 50
権限があれば一括ダウンロードができます
コンパイルメッセージ
In lambda function,
    inlined from ‘main()::<lambda(int, int)>’ at main.cpp:54:13,
    inlined from ‘int main()’ at main.cpp:100:14:
main.cpp:29:19: warning: ‘one_i’ may be used uninitialized [-Wmaybe-uninitialized]
   29 |         while (ni > i) {
      |                ~~~^~~
main.cpp: In function ‘int main()’:
main.cpp:78:13: note: ‘one_i’ was declared here
   78 |         int one_i, one_j, one_dist = 1e9;
      |             ^~~~~
In lambda function,
    inlined from ‘main()::<lambda(int, int)>’ at main.cpp:54:13,
    inlined from ‘int main()’ at main.cpp:100:14:
main.cpp:37:19: warning: ‘one_j’ may be used uninitialized [-Wmaybe-uninitialized]
   37 |         while (nj > j) {
      |                ~~~^~~
main.cpp: In function ‘int main()’:
main.cpp:78:20: note: ‘one_j’ was declared here
   78 |         int one_i, one_j, one_dist = 1e9;
      |                    ^~~~~
In lambda function,
    inlined from ‘main()::<lambda(int, int)>’ at main.cpp:49:13,
    inlined from ‘int main()’ at main.cpp:102:13:
main.cpp:29:19: warning: ‘zero_i’ may be used uninitialized [-Wmaybe-uninitialized]
   29 |         while (ni > i) {
      |                ~~~^~~
main.cpp: In function ‘int main()’:
main.cpp:79:13: note: ‘zero_i’ was declared here
   79 |         int zero_i, zero_j, zero_dist = 1e9;
      |             ^~~~~~
In lambda function,
    inlined from ‘main()::<lambda(int, int)>’ at main.cpp:49:13,
    inlined from ‘int main()’ at main.cpp:102:13:
main.cpp:37:19: warning: ‘zero_j’ may be used uninitialized [-Wmaybe-uninitialized]
   37 |         while (nj > j) {
      |                ~~~^~~
main.cpp: In function ‘int main()’:
main.cpp:79:21: note: ‘zero_j’ was declared here
   79 |         int zero_i, zero_j, zero_dist = 1e9;
      |                     ^~~~~~

ソースコード

diff #
raw source code 

#include <bits/stdc++.h>

#include <atcoder/all>
#define rep(i, a, b) for (ll i = (ll)(a); i < (ll)(b); i++)
using namespace atcoder;
using namespace std;

typedef long long ll;

template <typename T>
ostream &operator<<(ostream &os, const vector<T> &v) {
    int n = v.size();
    rep(i, 0, n) { os << v[i] << " \n"[i == n - 1]; }
    return os;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    cout << fixed << setprecision(12);
    int n, t;
    cin >> n >> t;
    vector a(n, vector<int>(n));
    rep(i, 0, n) rep(j, 0, n) cin >> a[i][j];
    int hand = 0;
    int ni = 0, nj = 0;
    string ans;
    auto move = [&](int i, int j) {
        while (ni > i) {
            ans += 'U';
            ni--;
        }
        while (ni < i) {
            ans += 'D';
            ni++;
        }
        while (nj > j) {
            ans += 'L';
            nj--;
        }
        while (nj < j) {
            ans += 'R';
            nj++;
        }
        ni = i;
        nj = j;
    };
    auto copy = [&](int i, int j) {
        move(i, j);
        ans += 'C';
        hand ^= a[i][j];
    };
    auto write = [&](int i, int j) {
        move(i, j);
        ans += 'W';
        a[i][j] ^= hand;
    };
    rep(i, 0, n) rep(j, 0, n) {
        if ((hand == 0) && ((a[i][j] >> 19) & 1)) {
            copy(i, j);
        }
    }
    rep(i, 0, n) {
        for (int j = 0; j < n; j++) {
            if (!((a[i][j] >> 19) & 1)) {
                write(i, j);
            }
        }
    }
    for (int d = 18; d >= 0; d--) {
        vector<vector<int>> exclusion(n, vector<int>(n));
        int mask = (1 << 20) - (1 << (d + 2));
        rep(i, 0, n) rep(j, 0, n) {
            if ((a[i][j] & mask) != mask) {
                exclusion[i][j] = 1;
            }
        }
        int one_i, one_j, one_dist = 1e9;
        int zero_i, zero_j, zero_dist = 1e9;
        rep(i, 0, n) rep(j, 0, n) {
            if (exclusion[i][j]) continue;
            int dist = abs(i - ni) + abs(j - nj);
            if ((a[i][j] >> d) & 1) {
                if (dist < one_dist) {
                    one_dist = dist;
                    one_i = i;
                    one_j = j;
                }
            } else {
                if (dist < zero_dist) {
                    zero_dist = dist;
                    zero_i = i;
                    zero_j = j;
                }
            }
        }
        if (one_dist == 1e9 || zero_dist == 1e9) {
            break;
        }
        write(one_i, one_j);
        copy(one_i, one_j);
        copy(zero_i, zero_j);
        rep(i, 0, n) rep(j, 0, n) {
            if (exclusion[i][j]) continue;
            if (!(a[i][j] >> d & 1)) {
                write(i, j);
            }
        }
    }
    ans = ans.substr(0, t);
    for (auto &c : ans) {
        cout << c << '\n';
    }
}
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