Submission #1132099

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Source Code Expand

#include <bits/stdc++.h>
#include <sys/time.h>
using namespace std;

#define rep(i,n) for(long long i = 0; i < (long long)(n); i++)
#define repi(i,a,b) for(long long i = (long long)(a); i < (long long)(b); i++)
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define fi first
#define se second
#define mt make_tuple
#define mp make_pair
template<class T1, class T2> bool chmin(T1 &a, T2 b) { return b < a && (a = b, true); }
template<class T1, class T2> bool chmax(T1 &a, T2 b) { return a < b && (a = b, true); }
#define exists find_if
#define forall all_of

using ll = long long; using vll = vector<ll>; using vvll = vector<vll>; using P = pair<ll, ll>;
using ld = long double;  using vld = vector<ld>; 
using vi = vector<int>; using vvi = vector<vi>; vll conv(vi& v) { vll r(v.size()); rep(i, v.size()) r[i] = v[i]; return r; }
using Pos = complex<double>;

namespace std{ namespace { template <class T> inline void hash_combine(size_t& seed, T const& v) { seed ^= hash<T>()(v) + 0x9e3779b9 + (seed<<6) + (seed>>2); } template <class Tuple, size_t Index = tuple_size<Tuple>::value - 1> struct HashValueImpl { static void apply(size_t& seed, Tuple const& tuple) { HashValueImpl<Tuple, Index-1>::apply(seed, tuple); hash_combine(seed, get<Index>(tuple)); } }; template <class Tuple> struct HashValueImpl<Tuple,0> { static void apply(size_t& seed, Tuple const& tuple) { hash_combine(seed, get<0>(tuple)); } }; } template <typename ... TT> struct hash<tuple<TT...>> { size_t operator()(tuple<TT...> const& tt) const { size_t seed = 0; HashValueImpl<tuple<TT...> >::apply(seed, tt); return seed; } }; } 
namespace std { template<typename U, typename V> struct hash<pair<U, V>> { size_t operator()(pair<U, V> const& v) const { return v.first ^ v.second; } }; } struct pairhash { public: template <typename T, typename U> size_t operator()(const pair<T, U> &x) const { return hash<T>()(x.first) ^ hash<U>()(x.second); } };

template <typename T, typename U> ostream &operator<<(ostream &o, const pair<T, U> &v) {  o << "(" << v.first << ", " << v.second << ")"; return o; }
template<size_t...> struct seq{}; template<size_t N, size_t... Is> struct gen_seq : gen_seq<N-1, N-1, Is...>{}; template<size_t... Is> struct gen_seq<0, Is...> : seq<Is...>{};
template<class Ch, class Tr, class Tuple, size_t... Is>
void print_tuple(basic_ostream<Ch,Tr>& os, Tuple const& t, seq<Is...>){ using s = int[]; (void)s{0, (void(os << (Is == 0? "" : ", ") << get<Is>(t)), 0)...}; }
template<class Ch, class Tr, class... Args> 
auto operator<<(basic_ostream<Ch, Tr>& os, tuple<Args...> const& t) -> basic_ostream<Ch, Tr>& { os << "("; print_tuple(os, t, gen_seq<sizeof...(Args)>()); return os << ")"; }
ostream &operator<<(ostream &o, const vvll &v) { rep(i, v.size()) { rep(j, v[i].size()) o << v[i][j] << " "; o << endl; } return o; }
template <typename T> ostream &operator<<(ostream &o, const vector<T> &v) { o << '['; rep(i, v.size()) o << v[i] << (i != v.size()-1 ? ", " : ""); o << "]";  return o; }
template <typename T>  ostream &operator<<(ostream &o, const set<T> &m) { o << '['; for (auto it = m.begin(); it != m.end(); it++) o << *it << (next(it) != m.end() ? ", " : ""); o << "]";  return o; }
template <typename T, typename U>  ostream &operator<<(ostream &o, const map<T, U> &m) { o << '['; for (auto it = m.begin(); it != m.end(); it++) o << *it << (next(it) != m.end() ? ", " : ""); o << "]";  return o; }
template <typename T, typename U>  ostream &operator<<(ostream &o, const unordered_map<T, U> &m) { o << '['; for (auto it = m.begin(); it != m.end(); it++) o << *it; o << "]";  return o; }
vector<int> range(const int x, const int y) { vector<int> v(y - x + 1); iota(v.begin(), v.end(), x); return v; }
template <typename T> istream& operator>>(istream& i, vector<T>& o) { rep(j, o.size()) i >> o[j]; return i;}
string bits_to_string(ll input, ll n=64) { string s; rep(i, n) s += '0' + !!(input & (1ll << i)); reverse(all(s)); return s; }
template <typename T> unordered_map<T, ll> counter(vector<T> vec){unordered_map<T, ll> ret; for (auto&& x : vec) ret[x]++; return ret;};
string substr(string s, P x) {return s.substr(x.fi, x.se - x.fi); }
double sec() { struct timeval tv; gettimeofday(&tv, NULL); return tv.tv_sec + tv.tv_usec * 1e-6; }
struct ci : public iterator<forward_iterator_tag, ll> { ll n; ci(const ll n) : n(n) { } bool operator==(const ci& x) { return n == x.n; } bool operator!=(const ci& x) { return !(*this == x); } ci &operator++() { n++; return *this; } ll operator*() const { return n; } };

static const double EPS = 1e-14;
static const long long INF = 1e18;
static const long long mo = 1e9+7;
#define ldout fixed << setprecision(40) 

ll n = 3;

ll f(ll x, ll i, ll j) {
    ll nextx = x;
    rep(k, n) {
        ll kk = !!(x & (1ll << (n*i+k)));
//        cout << kk << endl;
        if (kk) {
            nextx |= (1ll << (j + n * k));
//            cout << bits_to_string(nextx, 9) << endl;
//            cout << bits_to_string((1ll << (j + n * k)), 9) << endl;
        } else {
            nextx &= ~(1ll << (j + n * k));
//            cout << bits_to_string(nextx, 9) << endl;
//            cout << bits_to_string(~(1ll << (j + n * k)), 9) << endl;
        }
//        cout << (1ll << (j + n * k)) << endl;
    }
    return nextx;
}

int main(void) {
    cin.tie(0); ios::sync_with_stdio(false);
    /*
    cout << bits_to_string(f(0b010111010, 1, 0), 9) << endl;
    return 0;
    */
    cin >> n;
    assert(n <= 3);
    ll nnode = (1<<(n*n));
    ll start = 0;
    vector<string> input(n); 
    rep(i, n) cin >> input[i];
//    cout << input << endl;
    rep(i, n) rep(j, n) {
        if (input[i][j] == '#') {
//            cout << i << " "<< j << endl;
            start |= (1ll << (n*i + j));
        }
    }
//    cout << start << endl;

    vvll g(nnode);
    rep(x, nnode) {
        rep(i, n) rep(j, n) {
            g[x].pb(f(x, i, j));
        }
    }
    /*
    rep(i, nnode) {
        cout << bits_to_string(i, n*n) << " : ";
        for (auto v : g[i]) {
            cout << bits_to_string(v, n*n) << " ";
        }
        cout << endl;
    }
    */

    vll done(nnode, -1);
    queue<P> q;
    q.push(P(start, 0));
    while(q.size()) {
        ll v = q.front().fi;
        ll d = q.front().se;
        q.pop();
        if (done[v] != -1) continue;
        done[v] = d;
        for (auto nextv : g[v]) {
            q.push(P(nextv, d+1));
        }
    }
        
    cout << (done[nnode-1] != -1 ? done[nnode-1] : -1) << endl;

    return 0;
}

Submission Info

Judge Result