結果
| 問題 | 
                            No.5001 排他的論理和でランニング
                             | 
                    
| ユーザー | 
                             どらら
                         | 
                    
| 提出日時 | 2018-03-17 19:20:15 | 
| 言語 | C++14  (gcc 13.3.0 + boost 1.87.0)  | 
                    
| 結果 | 
                             
                                AC
                                 
                             
                            
                         | 
                    
| 実行時間 | 1,355 ms / 1,500 ms | 
| コード長 | 3,841 bytes | 
| コンパイル時間 | 1,535 ms | 
| 実行使用メモリ | 7,420 KB | 
| スコア | 52,428,742 | 
| 最終ジャッジ日時 | 2020-03-12 20:19:00 | 
| 
                            ジャッジサーバーID (参考情報)  | 
                        judge9 / | 
| 純コード判定しない問題か言語 | 
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| ファイルパターン | 結果 | 
|---|---|
| other | AC * 50 | 
ソースコード
#include <bits/stdc++.h>
#include <sys/time.h>
using namespace std;
#define REP(i,a,n) for(int i=(a); i<(int)(n); i++)
#define rep(i,n) REP(i,0,n)
#define FOR(it,c) for(__typeof((c).begin()) it=(c).begin(); it!=(c).end(); ++it)
#define ALLOF(c) (c).begin(), (c).end()
typedef long long ll;
typedef unsigned long long ull;
unsigned int xor128(){
  static unsigned int x=123456789, y=362436069, z=521288629, w=88675123;
  unsigned int t;
  t=(x^(x<<11));
  x=y; y=z; z=w;
  return w=(w^(w>>19))^(t^(t>>8));
}
class Timer {
  double start_time;
  double getNow(){
    struct timeval t;
    gettimeofday(&t, NULL);
    return t.tv_sec + t.tv_usec * 1e-6;
  }
public:
  void start(){
    start_time = getNow();
  }
  double getSec(){
    return getNow()-start_time;
  }
};
vector<int> solve(const vector<int>& v, int N, int M){
  Timer timer;
  timer.start();
  bitset<100005> w;
  int score = 0;
  rep(i,M){
    w[i] = 1;
    score ^= v[i];
  }
  int t = 0;
  while(t<50){
    /*
    for(int i=22; i>=0; i--){
      if((score>>i)&1) cout << 1;
      else cout << 0;
    }
    cout << endl;
    */
    int br = 22 - (t%23);
    int th = 1<<(br+1);
    vector<int> p1, p0;
    vector<int> q1, q0;
    rep(i,N){
      if(v[i]>=th) continue;
      if(w[i]){
        if((v[i]>>br)&1) p1.push_back(i);
        else p0.push_back(i);
      }else{
        if((v[i]>>br)&1) q1.push_back(i);
        else q0.push_back(i);
      }
      if(p1.size()>1 && p0.size()>1 && q1.size()>1 && q0.size()>1) break;
    }
    
    if((score>>br)&1){      
      if(p1.size()>1 && q0.size()>1){
        random_shuffle(ALLOF(p1));
        random_shuffle(ALLOF(q0));
        
        int t_score = score;
        t_score ^= v[p1[0]];
        t_score ^= v[p1[1]];
        t_score ^= v[q0[0]];
        t_score ^= v[q0[1]];
        if(score <= t_score){
          w[p1[0]] = 0;
          w[p1[1]] = 0;
          w[q0[0]] = 1;
          w[q0[1]] = 1;
          score ^= v[p1[0]];
          score ^= v[p1[1]];
          score ^= v[q0[0]];
          score ^= v[q0[1]];
        }
      }  
      else if(p0.size()>1 && q1.size()>1){        
        int t_score = score;
        t_score ^= v[p0[0]];
        t_score ^= v[p0[1]];
        t_score ^= v[q1[0]];
        t_score ^= v[q1[1]];
        if(score <= t_score){
          w[p0[0]] = 0;
          w[p0[1]] = 0;
          w[q1[0]] = 1;
          w[q1[1]] = 1;
          score ^= v[p0[0]];
          score ^= v[p0[1]];
          score ^= v[q1[0]];
          score ^= v[q1[1]];
        }
      }  
    }else{      
      if(p1.size()>0 && q0.size()>0){
        w[p1[0]] = 0;
        w[q0[0]] = 1;
        score ^= v[p1[0]];
        score ^= v[q0[0]];
      }
      else if(p0.size()>0 && q1.size()>0){        
        w[p0[0]] = 0;
        w[q1[0]] = 1;
        score ^= v[p0[0]];
        score ^= v[q1[0]];
      }
    }
    t++;
  }
#ifdef LOCAL
  cerr << score << endl;
  for(int i=22; i>=0; i--){
    if((score>>i)&1) cerr << 1;
    else cerr << 0;
  }
  cerr << endl;
#endif
  vector<int> ret;
  rep(i,w.size()){
    if(w[i]) ret.push_back(v[i]);
  }
  return ret;
}
int main(){  
  int N, M;
  cin >> N >> M;
  
  vector<int> v;
  rep(i,N){
#ifdef LOCAL
    v.push_back(1+i);
#else
    int a;
    cin >> a;
    v.push_back(a);
#endif
  }
  int score = 0;
  vector<int> ret;
  Timer atimer;
  atimer.start();
  while(atimer.getSec()<1.3){
    random_shuffle(ALLOF(v));
    vector<int> res = solve(v, N, M);
    int t_score = 0;
    rep(i,M){
      t_score ^= res[i];
    }
    if(score < t_score){
      score = t_score;
      ret = res;
    }
  }
#ifdef LOCAL
  cerr << score << endl;
  for(int i=22; i>=0; i--){
    if((score>>i)&1) cerr << 1;
    else cerr << 0;
  }
  cerr << endl;
#endif
#ifndef LOCAL
  rep(i,ret.size()){
    if(i>0) cout << " ";
    cout << ret[i];
  }
  cout << endl;
#endif
  return 0;
}
            
            
            
        
            
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