1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
| #include <bits/stdc++.h>
#pragma optimization_level 3
#pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#pragma GCC optimization ("unroll-loops")
using namespace std;
struct PairHash {
inline std::size_t operator()(const std::pair<int, int> &v) const { return v.first * 31 + v.second; }
};
#define Code ios_base::sync_with_stdio(false);
#define By ios::sync_with_stdio(0);
#define Sumfi cout.tie(NULL);
using ll = long long;
using ld = long double;
const ld PI = 3.14159265358979323846;
const ll INF = 1e18;
const ld EPS = 1e-9;
const ll MAX_N = 101010;
const ll mod = 1e9+7;
typedef pair<ll, ll> pll;
typedef vector<pll> vpll;
typedef array<ll,3> all3;
typedef array<ll,5> all5;
typedef vector<all3> vall3;
typedef vector<all5> vall5;
typedef vector<ll> vll;
typedef vector<vll> vvll;
typedef vector<int> vi;
typedef vector<string> vs;
typedef vector<vs> vvs;
typedef unordered_set<ll> usll;
typedef unordered_set<pll, PairHash> uspll;
typedef unordered_map<ll, ll> umll;
#define rep(i,n) for(ll i=0;i<n;i++)
#define rrep(i,m,n) for(ll i=n;i>=m;i--)
#define all(a) begin(a), end(a)
#define rall(a) rbegin(a), rend(a)
ll __gcd(ll x, ll y) { return !y ? x : __gcd(y, x % y); }
ll __lcm(ll x, ll y) { return x * y / __gcd(x,y); }
using namespace std;
uspll bfs(vs& G, pll A) {
uspll us;
ll dy[4]{-1,0,1,0}, dx[4]{0,1,0,-1};
ll n = G.size(), m = G[0].size();
unordered_map<ll, pll> row, col;
queue<pll> q;
q.push(A);
G[A.first][A.second] = '1';
row[A.first] = {A.second, A.second};
col[A.second] = {A.first, A.first};
while(!q.empty()) {
auto [y, x] = q.front(); q.pop();
rep(i,4) {
ll ny = y + dy[i], nx = x + dx[i];
if(0 <= ny and ny < n and 0 <= nx and nx < m and G[ny][nx] == '0') {
G[ny][nx] = '1';
q.push({ny,nx});
if(!row.count(ny)) row[ny] = {nx, nx};
if(!col.count(nx)) col[nx] = {ny, ny};
row[ny].first = min(row[ny].first, nx);
row[ny].second = max(row[ny].second, nx);
col[nx].first = min(col[nx].first, ny);
col[nx].second = max(col[nx].second, ny);
}
}
}
for(auto& [y, xpll] : row) {
us.insert({y, xpll.first});
us.insert({y, xpll.second});
}
for(auto& [x, ypll] : col) {
us.insert({ypll.first, x});
us.insert({ypll.second, x});
}
return us;
}
ll solve(pll A, pll B, vs G) {
uspll aus = bfs(G, A);
if(G[B.first][B.second] == '1') return 0;
uspll bus = bfs(G, B);
ll res = INF;
for(auto& [ay, ax] : aus)
for(auto& [by, bx] : bus)
res = min(res, (ay - by) * (ay - by) + (ax - bx) * (ax - bx));
return res;
}
int main() {
Code By Sumfi
ll tc = 1;
for (ll i = 1; i <= tc; i++) {
ll n;
cin>>n;
pll A, B;
vs G(n);
cin>>A.first>>A.second;
cin>>B.first>>B.second;
rep(i,n) cin>>G[i];
A.first -= 1, A.second -= 1;
B.first -= 1, B.second -= 1;
cout<<solve(A,B,G)<<endl;
}
return 0;
}
|
