結果

問題 No.402 最も海から遠い場所
ユーザー kei
提出日時 2018-12-02 00:48:31
言語 C++14
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 887 ms / 3,000 ms
コード長 2,528 bytes
コンパイル時間 1,975 ms
コンパイル使用メモリ 183,124 KB
実行使用メモリ 121,228 KB
最終ジャッジ日時 2024-06-27 04:29:50
合計ジャッジ時間 6,317 ms
ジャッジサーバーID
(参考情報)
judge5 / judge2
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 * 19
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"
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:>
============================================================
=================================================================
=============================================================
================================================================
*/
int solve(){
int res = 0;
int H,W; cin >> H >> W;
vector<vector<char>> S(H+2,vector<char>(W+2,'.'));
vector<vector<int>> F(H+2,vector<int>(W+2,0));
for(int i = 1; i <= H;i++) for(int j = 1; j <= W;j++) cin >> S[i][j];
queue<pii> ps;
for(int i = 0; i <= H+1;i++){
for(int j = 0; j <= W+1;j++){
if(S[i][j] == '.'){
ps.push(pii(i,j));
}else{
F[i][j] = INF;
}
}
}
int dx[8] = {1,1,1,0,-1,-1,-1,0};
int dy[8] = {-1,0,1,1,1,0,-1,-1};
while(ps.size()){
int y,x; tie(y,x) = ps.front(); ps.pop();
for(int k = 0; k < 8;k++){
int ny = y + dy[k];
int nx = x + dx[k];
if(ny < 0 || nx < 0 || ny >= H+2 || nx >= W+2) continue;
if(S[ny][nx] == '#'){
if(F[ny][nx] > F[y][x] + 1){
F[ny][nx] = F[y][x] + 1;
ps.push(pii(ny,nx));
}
}
}
}
for(auto vec:F) for(auto out:vec) res = max(res,out);
return res;
}
int main(void) {
cin.tie(0); ios_base::sync_with_stdio(false);
cout << solve() << endl;
return 0;
}
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