結果

問題 No.3060 Erase Binary Matrix
コンテスト
ユーザー snuke
提出日時 2025-03-20 19:41:54
言語 C++23
(gcc 13.3.0 + boost 1.87.0)
結果
AC  
実行時間 19 ms / 2,000 ms
コード長 5,415 bytes
コンパイル時間 4,714 ms
コンパイル使用メモリ 296,592 KB
実行使用メモリ 7,324 KB
最終ジャッジ日時 2025-03-20 19:42:02
合計ジャッジ時間 6,577 ms
ジャッジサーバーID
（参考情報） 		judge1 / judge5
このコードへのチャレンジ
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ファイルパターン 結果
sample AC * 2
other AC * 49
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 geti()’:
main.cpp:26:23: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   26 | int geti(){int x;scanf("%d",&x);return x;}
      |                  ~~~~~^~~~~~~~~
main.cpp: In member function ‘void Solver::solve()’:
main.cpp:122:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  122 |     scanf("%d%d",&h,&w);
      |     ~~~~~^~~~~~~~~~~~~~

ソースコード

diff # 

#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rep1(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 fi first
#define se second
#define pb push_back
#define eb emplace_back
#define em emplace
#define pob pop_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define newline puts("")
#define vc vector
using namespace std;
template<class T> using vv = vc<vc<T>>;
template<class T> using PQ = priority_queue<T,vc<T>,greater<T>>;
using uint = unsigned; using ull = unsigned long long;
using vi = vc<int>; using vvi = vv<int>; using vvvi = vv<vi>;
using ll = long long; using vl = vc<ll>; using vvl = vv<ll>; using vvvl = vv<vl>;
using P = pair<int,int>; using vp = vc<P>; using vvp = vv<P>; using LP = pair<ll,ll>;
int geti(){int x;scanf("%d",&x);return x;}
vi pm(int n, int s=0) { vi a(n); iota(rng(a),s); return a;}
template<class T1,class T2>istream& operator>>(istream&i,pair<T1,T2>&v){return i>>v.fi>>v.se;}
template<class T1,class T2>ostream& operator<<(ostream&o,const pair<T1,T2>&v){return o<<v.fi<<","<<v.se;}
template<class T>istream& operator>>(istream&i,vc<T>&v){rep(j,sz(v))i>>v[j];return i;}
template<class T>string join(const T&v,const string&d=""){stringstream s;rep(i,sz(v))(i?s<<d:s)<<v[i];return s.str();}
template<class T>ostream& operator<<(ostream&o,const vc<T>&v){if(sz(v))o<<join(v," ");return o;}
template<class T>void vin(vc<T>&a){int n;cin>>n;a=vc<T>(n);cin>>a;}
template<class T>void vin(vv<T>&a){int n,m;cin>>n>>m;a=vv<T>(n,vc<T>(m));cin>>a;}
template<class T1,class T2>void operator--(pair<T1,T2>&a,int){a.fi--;a.se--;}
template<class T1,class T2>void operator++(pair<T1,T2>&a,int){a.fi++;a.se++;}
template<class T>void operator--(vc<T>&a,int){for(T&x:a)x--;}
template<class T>void operator++(vc<T>&a,int){for(T&x:a)x++;}
template<class T1,class T2>void operator+=(vc<T1>&a,T2 b){for(T1&x:a)x+=b;}
template<class T1,class T2>void operator-=(vc<T1>&a,T2 b){for(T1&x:a)x-=b;}
template<class T1,class T2>void operator*=(vc<T1>&a,T2 b){for(T1&x:a)x*=b;}
template<class T1,class T2>void operator/=(vc<T1>&a,T2 b){for(T1&x:a)x/=b;}
template<class T>void operator+=(vc<T>&a,const vc<T>&b){a.insert(a.end(),rng(b));}
template<class T1,class T2>pair<T1,T2>operator+(const pair<T1,T2>&a,const pair<T1,T2>&b){return {a.fi+b.fi,a.se+b.se};}
template<class T1,class T2>pair<T1,T2>operator-(const pair<T1,T2>&a,const pair<T1,T2>&b){return {a.fi-b.fi,a.se-b.se};}
template<class T>pair<T,T>operator*(const pair<T,T>&a,T b){return {a.fi*b,a.se*b};}
template<class T1,class T2>bool mins(T1& x,const T2&y){if(y<x){x=y;return true;}else return false;}
template<class T1,class T2>bool maxs(T1& x,const T2&y){if(x<y){x=y;return true;}else return false;}
template<class T>T min(const vc<T>&a){return *min_element(rng(a));}
template<class T>T max(const vc<T>&a){return *max_element(rng(a));}
template<class Tx,class Ty>Tx dup(Tx x, Ty y){return (x+y-1)/y;}
template<class T>ll suma(const vc<T>&a){ll s=0;for(auto&&x:a)s+=x;return s;}
template<class T>ll suma(const vv<T>&a){ll s=0;for(auto&&x:a)s+=suma(x);return s;}
template<class T>void uni(T&a){sort(rng(a));a.erase(unique(rng(a)),a.end());}
template<class T>void prepend(vc<T>&a,const T&x){a.insert(a.begin(),x);}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("-1"); return;}
#define yes { puts("Yes"); return;}
#define no { puts("No"); return;}
#define rtn(x) { cout<<(x)<<'\n'; return;} // flush!
#define yn {puts("Yes");}else{puts("No");}
using vs = vc<string>;
void vin(vs& s){int n,m;cin>>n>>m;s=vs(n);cin>>s;}

// SCC
// upstream is smaller id
struct scc {
  int n, k;
  vvi to, ot, d, gt; // to, rev_to, groups, group_to
  vi g, used, kv; // group, gomi, topo_ord
  scc(int n=0):n(n),to(n),ot(n){}
  int inc() { to.pb(vi()); ot.pb(vi()); return n++;}
  void add(int a, int b) { to[a].pb(b); ot[b].pb(a);}
  void dfs(int v) {
    if (used[v]) return;
    used[v] = 1;
    rep(i,sz(to[v])) dfs(to[v][i]);
    kv[--k] = v;
  }
  void rfs(int v) {
    if (g[v] != -1) return;
    g[v] = k; d[k].pb(v);
    rep(i,sz(ot[v])) rfs(ot[v][i]);
  }
  void init() {
    k = n;
    used = kv = vi(n);
    g = vi(n,-1);
    rep(i,n) dfs(i);
    rep(i,n) if (g[kv[i]] == -1)  {
      d.pb(vi());
      rfs(kv[i]);
      k++;
    }
    gt = vvi(k);
    rep(i,n)rep(j,sz(ot[i])) {
      int v = g[ot[i][j]], u = g[i];
      if (v != u) gt[v].pb(u);
    }
    rep(i,k) {
      sort(rng(gt[i]));
      gt[i].erase(unique(rng(gt[i])),gt[i].end());
    }
  }

  int maxlen() {
    init();
    vi dp(k);
    drep(i,k) {
      for (int j : gt[i]) maxs(dp[i], dp[j]);
      dp[i] += sz(d[i]);
    }
    return max(dp);
  }
};
//
struct Solver {
  void solve() {
    int h,w;
    scanf("%d%d",&h,&w);
    vs s(h);
    cin>>s;
    using BS = bitset<500>;

    vc<BS> d(h);
    rep(i,h)rep(j,w) d[i][j] = s[i][j]-'0';

    scc g(h);
    rep(i,h)rep(j,h) if (i != j && (d[i]&d[j]) == d[j]) g.add(i,j);

    int ans = h - g.maxlen();
    cout<<ans<<endl;
  }
};

int main() {
  // cin.tie(nullptr); ios::sync_with_stdio(false);
  int ts = 1;
  // scanf("%d",&ts);
  rep1(ti,ts) {
    Solver solver;
    solver.solve();
  }
  return 0;
}
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