結果

問題 No.1400 すごろくで世界旅行
コンテスト
ユーザー snuke
提出日時 2021-02-19 22:46:44
言語 C++17
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 1,434 ms / 3,153 ms
コード長 3,607 bytes
コンパイル時間 3,956 ms
コンパイル使用メモリ 205,496 KB
最終ジャッジ日時 2025-01-19 01:06:43
ジャッジサーバーID
（参考情報） 		judge4 / judge6
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 * 18
権限があれば一括ダウンロードができます
コンパイルメッセージ
main.cpp: In function ‘int getInt()’:
main.cpp:35:25: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   35 | int getInt(){int x;scanf("%d",&x);return x;}
      |                    ~~~~~^~~~~~~~~
main.cpp: In member function ‘void Solver::solve()’:
main.cpp:68:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   68 |     scanf("%d",&n);
      |     ~~~~~^~~~~~~~~

ソースコード

diff # 

#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define rrng(a) a.rbegin(),a.rend()
#define isin(x,l,r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define eb emplace_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)),x.end())
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define show(x) cerr<<#x<<" = "<<x<<endl;
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define bn(x) ((1<<x)-1)
#define dup(x,y) (((x)+(y)-1)/(y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef tuple<int,int,int> T;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
typedef vector<T> vt;
int getInt(){int x;scanf("%d",&x);return x;}
template<typename T>istream& operator>>(istream&i,v(T)&v){rep(j,sz(v))i>>v[j];return i;}
template<typename T>string join(const v(T)&v){stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}
template<typename T>ostream& operator<<(ostream&o,const v(T)&v){if(sz(v))o<<join(v);return o;}
template<typename T1,typename T2>istream& operator>>(istream&i,pair<T1,T2>&v){return i>>v.fi>>v.se;}
template<typename T1,typename T2>ostream& operator<<(ostream&o,const pair<T1,T2>&v){return o<<v.fi<<","<<v.se;}
template<typename T>bool mins(T& x,const T&y){if(x>y){x=y;return true;}else return false;}
template<typename T>bool maxs(T& x,const T&y){if(x<y){x=y;return true;}else return false;}
template<typename T>ll suma(const v(T)&a){ll res(0);for(auto&&x:a)res+=x;return res;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("No"); return;}
#define yn {puts("Yes");}else{puts("No");}
const int MX = 200005;
typedef v(string) vs;
random_device _rd;
struct xrand {
  static const uint64_t _x = 88172645463325252ull;
  uint64_t x;
  xrand(): x(_x ^ (_rd()+time(0))) {}
  xrand(uint64_t seed): x(_x ^ seed) {}
  uint64_t get() {
    x = x ^ (x << 7);
    return x = x ^ (x >> 9);
  }
  int operator()(int n) { return get()%n;}
  int operator()(int l, int r) { return get()%(r-l+1) + l;}
} rnd;

struct Solver {
  void solve() {
    int n; ll d;
    scanf("%d",&n);
    cin>>d;
    vs s(n);
    cin>>s;
    int n2 = n*2;
    // vi g(n2,vi(n2,INF));
    vvi to(n2);
    rep(i,n)rep(j,n) if (s[i][j] == '1') {
      to[i].pb(n+j);
      to[n+i].pb(j);
    }
    vi ok(n2);
    int cnt = 0;
    rep(ssv,n) {
      int sv = ssv;
      while (!ok[sv] && cnt < 100) {
        vi dist(n2,INF);
        queue<int> q;
        q.push(sv);
        dist[sv] = 0;
        while (sz(q)) {
          int v = q.front(); q.pop();
          for (int u : to[v]) {
            if (dist[u] != INF) continue;
            dist[u] = dist[v]+1;
            q.push(u);
          }
        }
        int ma = 0;
        int o = (d%2)?n:0;
        rep(i,n) if (!ok[i]) maxs(ma, dist[o+i]);
        if (ma == INF) dame;
        if (ma > d) dame;
        rep(i,n) if (dist[i]+ma <= d) ok[i] = 1;
        ok[sv] = 1;
        rep(i,n) if (!ok[i] && ma == dist[o+i]) sv = i;
        ++cnt;
      }
    }
    cout<<"Yes"<<endl;
  }
};

int main() {
  int ts = 1;
  // scanf("%d",&ts);
  rrep(ti,ts) {
    Solver solver;
    solver.solve();
  }
  return 0;
}
0