結果
| 問題 |
No.348 カゴメカゴメ
|
| コンテスト | |
| ユーザー |
heno239
|
| 提出日時 | 2020-09-13 14:10:39 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 123 ms / 2,000 ms |
| コード長 | 4,010 bytes |
| コンパイル時間 | 1,612 ms |
| コンパイル使用メモリ | 140,260 KB |
| 実行使用メモリ | 40,708 KB |
| 最終ジャッジ日時 | 2024-06-12 06:43:28 |
| 合計ジャッジ時間 | 5,131 ms |
|
ジャッジサーバーID (参考情報) |
judge4 / judge5 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 53 |
ソースコード
#include<iostream>
#include<string>
#include<cstdio>
#include<vector>
#include<cmath>
#include<algorithm>
#include<functional>
#include<iomanip>
#include<queue>
#include<ciso646>
#include<random>
#include<map>
#include<set>
#include<bitset>
#include<stack>
#include<unordered_map>
#include<utility>
#include<cassert>
#include<complex>
#include<numeric>
#include<array>
//#include<atcoder/dsu>
//#include<atcoder/fenwicktree>
//#include<atcoder/math>
//#include<atcoder/maxflow>
using namespace std;
//#define int long long
typedef long long ll;
typedef unsigned long long ul;
typedef unsigned int ui;
constexpr ll mod = 998244353;
const ll INF = mod * mod;
typedef pair<int, int>P;
#define stop char nyaa;cin>>nyaa;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define Rep(i,sta,n) for(int i=sta;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define per1(i,n) for(int i=n;i>=1;i--)
#define Rep1(i,sta,n) for(int i=sta;i<=n;i++)
#define all(v) (v).begin(),(v).end()
typedef pair<ll, ll> LP;
typedef long double ld;
typedef pair<ld, ld> LDP;
const ld eps = 1e-8;
const ld pi = acosl(-1.0);
ll mod_pow(ll x, ll n, ll m) {
if (x >= m)x %= m;
ll res = 1;
while (n) {
if (n & 1)res = res * x % m;
x = x * x % m; n >>= 1;
}
return res;
}
struct uf {
private:
vector<int> par, ran;
public:
uf(int n) {
par.resize(n, 0);
ran.resize(n, 0);
rep(i, n) {
par[i] = i;
}
}
int find(int x) {
if (par[x] == x)return x;
else return par[x] = find(par[x]);
}
void unite(int x, int y) {
x = find(x), y = find(y);
if (x == y)return;
if (ran[x] < ran[y]) {
par[x] = y;
}
else {
par[y] = x;
if (ran[x] == ran[y])ran[x]++;
}
}
bool same(int x, int y) {
return find(x) == find(y);
}
};
int dx[8] = { 0,1,1,1,0,-1,-1,-1 };
int dy[8] = { 1,1,0,-1,-1,-1,0,1 };
char mp[1004][1004];
void solve() {
int h, w; cin >> h >> w;
rep(i, h + 4)rep(j, w + 4)mp[i][j] = '.';
rep1(i, h)rep1(j, w)cin >> mp[i+1][j+1];
rep(i, h + 4)rep(j, w + 4) {
if (i == 0 || j == 0 || i == h + 3 || j == w + 3) {
mp[i][j] = 'x';
}
}
h += 4; w += 4;
uf u(h* w);
rep(i, h)rep(j, w) {
if (mp[i][j] != 'x')continue;
rep(d, 8) {
int nx = i + dx[d];
int ny = j + dy[d];
if (nx < 0 || ny < 0 || nx == h || ny == w)continue;
if (mp[nx][ny] == 'x') {
u.unite(i * w + j, nx * w + ny);
}
}
}
vector<vector<int>> fG(h* w);
queue<int> q;
q.push(u.find(0));
vector<vector<bool>> used(h,vector<bool>(w,false));
while (!q.empty()) {
int fr = q.front(); q.pop();
int x = fr / w, y = fr%w;
queue<P> que;
rep(d, 8) {
int nx = x + dx[d];
int ny = y + dy[d];
if (nx < 0 || ny < 0 || nx == h || ny == w)continue;
if (used[nx][ny] || mp[nx][ny] == 'x')continue;
que.push({ nx,ny });
used[nx][ny] = true;
}
vector<int> tos;
while (!que.empty()) {
P p = que.front(); que.pop();
int cx = p.first, cy = p.second;
rep(d, 8) {
if (dx[d] == 0 || dy[d] == 0) {
int nx = cx + dx[d];
int ny = cy + dy[d];
if (nx < 0 || ny < 0 || nx == h || ny == w)continue;
if (mp[nx][ny] == 'x') {
int tp = u.find(nx * w + ny);
if (tp != fr)tos.push_back(tp);
continue;
}
if (!used[nx][ny]) {
used[nx][ny] = true;
que.push({ nx, ny });
}
}
}
}
sort(all(tos));
tos.erase(unique(all(tos)),tos.end());
fG[fr] = tos;
for (int id : tos)q.push(id);
}
vector<int> cnt(h* w);
rep(i, h)rep(j, w) {
int p = u.find(i * w + j);
cnt[p]++;
}
cnt[u.find(0)] = 0;
function<P(int)> dfs = [&](int id)->P {
P res = { 0,cnt[id] };
for (int to : fG[id]) {
P nex = dfs(to);
res.first += max(nex.first, nex.second);
res.second += nex.first;
}
return res;
};
P p = dfs(u.find(0));
int ans = max(p.first, p.second);
cout << ans << "\n";
}
signed main() {
ios::sync_with_stdio(false);
cin.tie(0);
//cout << fixed << setprecision(15);
//init_f();
//init();
//expr();
//int t; cin >> t; rep(i, t)
solve();
return 0;
}
heno239