提出 #8588376

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ソースコード 拡げる

#include <bits/stdc++.h>
using namespace std;
#define _MACRO(_1, _2, _3, NAME, ...) NAME
#define _repl(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define _rep(i,n) _repl(i,0,n)
#define rep(...) _MACRO(__VA_ARGS__, _repl, _rep)(__VA_ARGS__)
#define pb push_back
#define all(x) begin(x),end(x)
#define uniq(x) sort(all(x)),(x).erase(unique(all(x)),end(x))
#ifdef LOCAL
#define dbg(...) _dbg(#__VA_ARGS__, __VA_ARGS__)
void _dbg(string){cerr<<endl;}
template<class H,class... T> void _dbg(string s,H h,T... t){int l=s.find(',');cerr<<s.substr(0,l)<<" = "<<h<<", ";_dbg(s.substr(l+1),t...);}
template<class T,class U> ostream& operator<<(ostream &o, const pair<T,U> &p){o<<"("<<p.first<<","<<p.second<<")";return o;}
template<class T> ostream& operator<<(ostream &o, const vector<T> &v){o<<"[";for(T t:v){o<<t<<",";}o<<"]";return o;}
#else
#define dbg(...) {}
#endif

bool debug = false;
string ans_debug;

bool ask(const vector<int>& v){
  if(debug){
    dbg(v);
    assert(v.size() == ans_debug.size() / 2);
    int r = 0,b=0;
    for(auto x : v){
      if(ans_debug[x]=='R') r++;
      else b++;
    }
    return r > b;
  } else {
    cout << "?";
    for(auto x : v) cout <<" " << x+1;
    cout << endl;
    string s;
    cin>>s;
    return s == "Red";
  }
}

int main(int argc, char* argv[]){
  if(argc==2){
    debug = true;
    ans_debug = string(argv[1]);
  }

  int n;
  cin>>n;

  if(n==1) {
    bool r = ask({0});
    if(r) cout << "! RB";
    else cout << "! BR";
    cout << endl;
    return 0;
  }

  int RED = 1;
  int BLK = 0;
  int UK = -1;
  vector<int> ans(2*n, UK);
  // find half set
  vector<int> h1,h2;

  auto f = [&](int i) {
    vector<int> cand;
    rep(j,n) cand.pb(i+j);
    return ask(cand);
  };

  int l=0, r=n;
  bool il = f(0);
  bool ir = !il;
  while(r-l>1) {
    int m = (l+r)/2;
    bool im = f(m);
    if(il == im) l = m;
    else r = m;
  }

  rep(i,n-1) h1.pb(l+i+1);

  rep(i,n-1) h2.pb((n+r+i)%(2*n));

  ans[l] = (il ? RED : BLK);
  ans[n+l] = (il ? BLK : RED);

  rep(i,2*n) if(ans[i] == UK){
    bool use_h1 = true;
    for(auto x : h1) if(x == i) use_h1 = false;
    vector<int> q = (use_h1) ? h1 : h2;
    q.pb(i);
    bool rep = ask(q);
    ans[i] = rep ? RED : BLK;
  }

  cout << "! ";
  rep(i,2*n) cout << (ans[i] == RED ? "R" : "B");
  cout << endl;

  return 0;
}

提出情報

ジャッジ結果