結果
| 問題 |
No.348 カゴメカゴメ
|
| コンテスト | |
| ユーザー |
kei
|
| 提出日時 | 2018-11-03 01:03:48 |
| 言語 | C++14 (gcc 13.3.0 + boost 1.87.0) |
| 結果 |
AC
|
| 実行時間 | 331 ms / 2,000 ms |
| コード長 | 4,058 bytes |
| コンパイル時間 | 2,224 ms |
| コンパイル使用メモリ | 196,876 KB |
| 実行使用メモリ | 31,152 KB |
| 最終ジャッジ日時 | 2024-11-20 18:00:24 |
| 合計ジャッジ時間 | 7,693 ms |
|
ジャッジサーバーID (参考情報) |
judge5 / judge2 |
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| ファイルパターン | 結果 |
|---|---|
| other | AC * 53 |
ソースコード
#include "bits/stdc++.h"
using namespace std;
typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int INF = 1e9;
const ll LINF = 1e18;
inline ll gcd(ll a, ll b) { return b ? gcd(b, a%b) : a; }
inline ll lcm(ll a, ll b) { return a / gcd(a, b)*b; }
template<class S,class T> ostream& operator << (ostream& out,const pair<S,T>& o){ out << "(" << o.first << "," << o.second << ")"; return out; }
template<class T> ostream& operator << (ostream& out,const vector<T> V){ for(int i = 0; i < V.size(); i++){ out << V[i]; if(i!=V.size()-1) out << " ";} return out; }
template<class T> ostream& operator << (ostream& out,const vector<vector<T> > Mat){ for(int i = 0; i < Mat.size(); i++) { if(i != 0) out << endl; out << Mat[i];} return out; }
template<class S,class T> ostream& operator << (ostream& out,const map<S,T> mp){ out << "{ "; for(auto it = mp.begin(); it != mp.end(); it++){ out << it->first << ":" << it->second; if(mp.size()-1 != distance(mp.begin(),it)) out << ", "; } out << " }"; return out; }
/*
<url:https://yukicoder.me/problems/no/348>
問題文============================================================
=================================================================
解説=============================================================
================================================================
*/
int dx[8] = {1,1,0,-1,-1,-1, 0, 1};
int dy[8] = {0,1,1,1 ,0 ,-1,-1,-1};
map<ll,ll> mp;
vector<int> Flag;
vector<set<int>> G;
pll rec(int n,int par = -1){
ll sum1 = 0,sum2 = 0;
if(Flag[n] == 0){
for(auto next:G[n]){
if(next == par) continue;
auto ret = rec(next,n);
sum1 += max(ret.first,ret.second);
sum2 += ret.second;
}
}else{
sum1 = mp[n];
for(auto next:G[n]){
if(next == par) continue;
auto ret = rec(next,n);
sum2 += max(ret.first,ret.second);
sum1 += ret.second;
}
}
return {sum1,sum2};
}
ll solve(){
ll res = 0;
int N,M; cin >> N >> M;
vector<vector<char>> grid(N+2,vector<char>(M+2,'.'));
for(int i = 1; i <= N; i++) for(int j = 1; j <= M;j++) cin >> grid[i][j];
vector<vector<int>> checked(N+2,vector<int>(M+2,-1));
int cnt = 0;
// 連なる.やxをグループ分け
for(int i = 0; i < N+2; i++){
for(int j = 0; j < M+2; j++){
if(checked[i][j]!=-1) continue;
char c = grid[i][j];
int add = 0;
if(c == '.'){ Flag.push_back(0); add = 2;}
else{ Flag.push_back(1); add = 1;}
queue<pii> q; q.push({i,j});
while(q.size()){
int x,y;
tie(y,x) = q.front(); q.pop();
if(checked[y][x]!=-1) continue;
checked[y][x] = cnt;
for(int k = 0; k < 8; k+=add){
int nx = x + dx[k];
int ny = y + dy[k];
if(ny < 0 || nx < 0 || ny >= N+2 || nx >= M+2) continue;
if(checked[ny][nx]!=-1) continue;
if(grid[ny][nx] != c) continue;
q.push({ny,nx});
}
}
cnt++;
}
}
G.resize(cnt);
// グループ分けしたものからグラフを作る
for(int i = 0; i < N+2; i++){
for(int j = 0; j < M+2; j++){
mp[checked[i][j]]++;
int S = checked[i][j];
for(int k = 0; k < 8; k+=2){
int nx = j + dx[k];
int ny = i + dy[k];
if(ny < 0 || nx < 0 || ny >= N+2 || nx >= M+2) continue;
if(checked[i][j] == checked[ny][nx]) continue;
int T = checked[ny][nx];
G[S].insert(T);
G[T].insert(S);
}
}
}
auto ret = rec(0);
res = max(ret.first,ret.second);
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
kei