結果

問題 No.2509 Beam Shateki
ユーザー kwm_tkwm_t
提出日時 2023-10-21 01:22:53
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 4 ms / 2,000 ms
コード長 2,523 bytes
コンパイル時間 4,513 ms
コンパイル使用メモリ 260,024 KB
最終ジャッジ日時 2025-02-17 12:02:18
ジャッジサーバーID
(参考情報)
judge4 / judge5
このコードへのチャレンジ
(要ログイン)
ファイルパターン 結果
sample AC * 3
other AC * 61
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 #
プレゼンテーションモードにする

#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
//using mint = modint998244353;
//const int mod = 998244353;
//using mint = modint1000000007;
//const int mod = 1000000007;
const int INF = 1e9;
//const long long LINF = 1e18;
#define rep(i, n) for (int i = 0; i < (n); ++i)
#define rep2(i,l,r)for(int i=(l);i<(r);++i)
#define rrep(i, n) for (int i = (n-1); i >= 0; --i)
#define rrep2(i,l,r)for(int i=(r-1);i>=(l);--i)
#define all(x) (x).begin(),(x).end()
#define allR(x) (x).rbegin(),(x).rend()
#define P pair<int,int>
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
int op(int a, int b) { return max(a, b); }
int e() { return -INF; }
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int h, w; cin >> h >> w;
vector a(h, vector<int>(w));
rep(i, h)rep(j, w)cin >> a[i][j];
// i,j,i+j,j-i+(h-1)
vector<int>v0(h), v1(w), v2(h + w - 1), v3(h + w - 1);
rep(i, h)rep(j, w) {
v0[i] += a[i][j];
v1[j] += a[i][j];
v2[i + j] += a[i][j];
v3[j - i + (h - 1)] += a[i][j];
}
int ans = 0;
segtree<int, op, e>seg2(v2), seg3(v3);
rep(i, h) {// (i,0) (i,w-1)
//cout << i << endl;
int val1 = seg2.prod(0, i);
int val2 = seg2.prod(i + w, h + w - 1);
int val3 = seg3.prod(0, h - 1 - i);
int val4 = seg3.prod(w + (h - 1) - i, h + w - 1);
//cout << val1 << " " << val2 << " " << val3 << " " << val4 << endl;
chmax(ans, v0[i] + max({ val1,val2,val3,val4 }));
}
rep(j, w) {//(0,j),(h-1,j)
//cout << j << endl;
int val1 = seg2.prod(0, j);
int val2 = seg2.prod(j + h, h + w - 1);
int val3 = seg3.prod(0, j);
int val4 = seg3.prod(j + h, h + w - 1);
//cout << val1 << " " << val2 << " " << val3 << " " << val4 << endl;
chmax(ans, v1[j] + max({ val1,val2,val3,val4 }));
}
rep(i, h)rep(j, w) {
vector<int>v = { v0[i],v1[j],v2[i + j],v3[j - i + (h - 1)] };
sort(allR(v));
chmax(ans, v[0] + v[1] - a[i][j]);
}
rep(i, v2.size())rep(j, v3.size()) {
int x = i;
int y = j - (h - 1);
if (0 == abs(x - y) % 2)continue;
chmax(ans, v2[i] + v3[j]);
}
sort(allR(v0));
if (v0.size() >= 2)chmax(ans, v0[0] + v0[1]);
sort(allR(v1));
if (v1.size() >= 2)chmax(ans, v1[0] + v1[1]);
sort(allR(v2));
if (v2.size() >= 2)chmax(ans, v2[0] + v2[1]);
sort(allR(v3));
if (v3.size() >= 2)chmax(ans, v3[0] + v3[1]);
cout << ans << endl;
return 0;
}
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