結果
| 問題 | No.2509 Beam Shateki | 
| コンテスト | |
| ユーザー |  pmankirai | 
| 提出日時 | 2023-10-25 03:58:36 | 
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) | 
| 結果 | 
                                AC
                                 
                             | 
| 実行時間 | 1,831 ms / 2,000 ms | 
| コード長 | 3,219 bytes | 
| コンパイル時間 | 1,906 ms | 
| コンパイル使用メモリ | 180,344 KB | 
| 実行使用メモリ | 6,944 KB | 
| 最終ジャッジ日時 | 2024-09-24 23:26:35 | 
| 合計ジャッジ時間 | 54,153 ms | 
| ジャッジサーバーID (参考情報) | judge2 / judge1 | 
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| ファイルパターン | 結果 | 
|---|---|
| sample | AC * 3 | 
| other | AC * 61 | 
コンパイルメッセージ
main.cpp: In function 'void solve()':
main.cpp:63:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   63 |         auto [i1, j1] = getIJ(ij1);
      |              ^
main.cpp:64:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   64 |         auto [i2, j2] = getIJ(ij2);
      |              ^
            
            ソースコード
#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (n); i++)
#define rep1(i, n) for (int i = 1; i <= (n); i++)
#define rrep(i, n) for (int i = n - 1; i >= 0; i--)
#define rrep1(i, n) for (int i = n; i >= 1; i--)
#define all(x) x.begin(), x.end()
#define rall(x) x.rbegin(), x.rend()
#define eb emplace_back
#define fi first
#define se second
#define sz(x) (int)(x).size()
template <class T> using V = vector<T>;
template <class T> using VV = V<V<T>>;
typedef long long int ll;
void speedUpIO() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
}
template <class T> bool chmax(T &a, const T &b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}
template <class T> bool chmin(T &a, const T &b) {
    if (b < a) {
        a = b;
        return true;
    }
    return false;
}
/*--------------------------------------------------*/
typedef pair<int, int> P;
const int INF = 1e9;
const ll LINF = 1e18;
const int MAX = 100010;
V<int> dx = {1, 0, -1, 0, 1, 1, -1, -1};
V<int> dy = {0, -1, 0, 1, 1, -1, 1, -1};
void solve() {
    int h, w;
    cin >> h >> w;
    VV<int> a(h, V<int>(w));
    rep(i, h) rep(j, w) cin >> a[i][j];
    int ans = 0;
    auto getIJ = [&](int ij) -> P {
        if (ij < h) return {ij, 0};
        ij -= h;
        if (ij < h) return {ij, w - 1};
        ij -= h;
        if (ij < w) return {0, ij};
        ij -= w;
        return {h - 1, ij};
    };
    VV<bool> done(2 * (h + w), V<bool>(2 * (h + w)));
    rep(ij1, 2 * (h + w)) rep(ij2, 2 * (h + w)) {
        auto [i1, j1] = getIJ(ij1);
        auto [i2, j2] = getIJ(ij2);
        if (done[min(ij1, ij2)][max(ij1, ij2)]) continue;
        done[min(ij1, ij2)][max(ij1, ij2)] = true;
        rep(d1, 8) {
            int cnt = 0;
            V<int> b1;
            int ni1 = i1, nj1 = j1;
            while (0 <= ni1 && ni1 < h && 0 <= nj1 && nj1 < w) {
                cnt += a[ni1][nj1];
                b1.eb(a[ni1][nj1]);
                a[ni1][nj1] = 0;
                ni1 += dx[d1];
                nj1 += dy[d1];
            }
            rep(d2, 8) {
                int cnt2 = cnt;
                V<int> b2;
                int ni2 = i2, nj2 = j2;
                while (0 <= ni2 && ni2 < h && 0 <= nj2 && nj2 < w) {
                    cnt2 += a[ni2][nj2];
                    b2.eb(a[ni2][nj2]);
                    a[ni2][nj2] = 0;
                    ni2 += dx[d2];
                    nj2 += dy[d2];
                }
                chmax(ans, cnt2);
                ni2 = i2, nj2 = j2;
                rep(k, sz(b2)) {
                    a[ni2][nj2] = b2[k];
                    ni2 += dx[d2];
                    nj2 += dy[d2];
                }
            }
            ni1 = i1, nj1 = j1;
            rep(k, sz(b1)) {
                a[ni1][nj1] = b1[k];
                ni1 += dx[d1];
                nj1 += dy[d1];
            }
        }
    }
    cout << ans << "\n";
}
int main() {
    speedUpIO();
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        // cout << solve() << "\n";
        // cout << (solve() ? "Yes" : "No") << "\n";
        // cout << fixed << setprecision(15) << solve() << "\n";
    }
    return 0;
}
            
            
            
        