Submission #627999

#	Time	Username	Problem	Language	Result	Execution time	Memory
627999		Benq	Rarest Insects (IOI22_insects)	C++17	100 / 100	56 ms	340 KiB

insects

#include "insects.h"
 
#include <bits/stdc++.h>
using namespace std;
 
using ll = long long;
using db = long double; // or double, if TL is tight
using str = string; // yay python! 
 
// pairs
using pi = pair<int,int>;
using pl = pair<ll,ll>;
using pd = pair<db,db>;
#define mp make_pair
#define f first
#define s second
 
#define tcT template<class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT> using V = vector<T>; 
tcT, size_t SZ> using AR = array<T,SZ>; 
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pi>;
using vpl = V<pl>;
using vpd = V<pd>;
 
// vectors
// oops size(x), rbegin(x), rend(x) need C++17
#define sz(x) int((x).size())
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sor(x) sort(all(x)) 
#define rsz resize
#define ins insert 
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()
 
#define lb lower_bound
#define ub upper_bound
tcT> int lwb(V<T>& a, const T& b) { return int(lb(all(a),b)-bg(a)); }
tcT> int upb(V<T>& a, const T& b) { return int(ub(all(a),b)-bg(a)); }
 
// loops
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define rep(a) F0R(_,a)
#define each(a,x) for (auto& a: x)
 
const int MOD = 1e9+7; // 998244353;
const int MX = 2e5+5;
const ll BIG = 1e18; // not too close to LLONG_MAX
const db PI = acos((db)-1);
const int dx[4]{1,0,-1,0}, dy[4]{0,1,0,-1}; // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count()); 
template<class T> using pqg = priority_queue<T,vector<T>,greater<T>>;
 
// bitwise ops
// also see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
constexpr int pct(int x) { return __builtin_popcount(x); } // # of bits set
constexpr int bits(int x) { // assert(x >= 0); // make C++11 compatible until USACO updates ...
  return x == 0 ? 0 : 31-__builtin_clz(x); } // floor(log2(x)) 
constexpr int p2(int x) { return 1<<x; }
constexpr int msk2(int x) { return p2(x)-1; }
 
ll cdiv(ll a, ll b) { return a/b+((a^b)>0&&a%b); } // divide a by b rounded up
ll fdiv(ll a, ll b) { return a/b-((a^b)<0&&a%b); } // divide a by b rounded down
 
tcT> bool ckmin(T& a, const T& b) {
  return b < a ? a = b, 1 : 0; } // set a = min(a,b)
tcT> bool ckmax(T& a, const T& b) {
  return a < b ? a = b, 1 : 0; } // set a = max(a,b)
 
tcTU> T fstTrue(T lo, T hi, U f) {
  ++hi; assert(lo <= hi); // assuming f is increasing
  while (lo < hi) { // find first index such that f is true 
    T mid = lo+(hi-lo)/2;
    f(mid) ? hi = mid : lo = mid+1; 
  } 
  return lo;
}
tcTU> T lstTrue(T lo, T hi, U f) {
  --lo; assert(lo <= hi); // assuming f is decreasing
  while (lo < hi) { // find first index such that f is true 
    T mid = lo+(hi-lo+1)/2;
    f(mid) ? lo = mid : hi = mid-1;
  } 
  return lo;
}
tcT> void remDup(vector<T>& v) { // sort and remove duplicates
  sort(all(v)); v.erase(unique(all(v)),end(v)); }
tcTU> void erase(T& t, const U& u) { // don't erase
  auto it = t.find(u); assert(it != end(t));
  t.erase(it); } // element that doesn't exist from (multi)set
 
#define tcTUU tcT, class ...U
 
inline namespace Helpers {
  //////////// is_iterable
  // https://stackoverflow.com/questions/13830158/check-if-a-variable-type-is-iterable
  // this gets used only when we can call begin() and end() on that type
  tcT, class = void> struct is_iterable : false_type {};
  tcT> struct is_iterable<T, void_t<decltype(begin(declval<T>())),
                                    decltype(end(declval<T>()))
                                   >
                         > : true_type {};
  tcT> constexpr bool is_iterable_v = is_iterable<T>::value;
 
  //////////// is_readable
  tcT, class = void> struct is_readable : false_type {};
  tcT> struct is_readable<T,
          typename std::enable_if_t<
              is_same_v<decltype(cin >> declval<T&>()), istream&>
          >
      > : true_type {};
  tcT> constexpr bool is_readable_v = is_readable<T>::value;
 
  //////////// is_printable
  // // https://nafe.es/posts/2020-02-29-is-printable/
  tcT, class = void> struct is_printable : false_type {};
  tcT> struct is_printable<T,
          typename std::enable_if_t<
              is_same_v<decltype(cout << declval<T>()), ostream&>
          >
      > : true_type {};
  tcT> constexpr bool is_printable_v = is_printable<T>::value;
}
 
inline namespace Input {
  tcT> constexpr bool needs_input_v = !is_readable_v<T> && is_iterable_v<T>;
  tcTUU> void re(T& t, U&... u);
  tcTU> void re(pair<T,U>& p); // pairs
 
  // re: read
  tcT> typename enable_if<is_readable_v<T>,void>::type re(T& x) { cin >> x; } // default
  tcT> void re(complex<T>& c) { T a,b; re(a,b); c = {a,b}; } // complex
  tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i); // ex. vectors, arrays
  tcTU> void re(pair<T,U>& p) { re(p.f,p.s); }
  tcT> typename enable_if<needs_input_v<T>,void>::type re(T& i) {
    each(x,i) re(x); }
  tcTUU> void re(T& t, U&... u) { re(t); re(u...); } // read multiple
 
  // rv: resize and read vectors
  void rv(size_t) {}
  tcTUU> void rv(size_t N, V<T>& t, U&... u);
  template<class...U> void rv(size_t, size_t N2, U&... u);
  tcTUU> void rv(size_t N, V<T>& t, U&... u) {
    t.rsz(N); re(t);
    rv(N,u...); }
  template<class...U> void rv(size_t, size_t N2, U&... u) {
    rv(N2,u...); }
 
  // dumb shortcuts to read in ints
  void decrement() {} // subtract one from each
  tcTUU> void decrement(T& t, U&... u) { --t; decrement(u...); }
  #define ints(...) int __VA_ARGS__; re(__VA_ARGS__);
  #define int1(...) ints(__VA_ARGS__); decrement(__VA_ARGS__);
}
 
inline namespace ToString {
  tcT> constexpr bool needs_output_v = !is_printable_v<T> && is_iterable_v<T>;
 
  // ts: string representation to print
  tcT> typename enable_if<is_printable_v<T>,str>::type ts(T v) {
    stringstream ss; ss << fixed << setprecision(15) << v;
    return ss.str(); } // default
  tcT> str bit_vec(T t) { // bit vector to string
    str res = "{"; F0R(i,sz(t)) res += ts(t[i]);
    res += "}"; return res; }
  str ts(V<bool> v) { return bit_vec(v); }
  template<size_t SZ> str ts(bitset<SZ> b) { return bit_vec(b); } // bit vector
  tcTU> str ts(pair<T,U> p); // pairs
  tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v); // vectors, arrays
  tcTU> str ts(pair<T,U> p) { return "("+ts(p.f)+", "+ts(p.s)+")"; }
  tcT> typename enable_if<is_iterable_v<T>,str>::type ts_sep(T v, str sep) {
    // convert container to string w/ separator sep
    bool fst = 1; str res = "";
    for (const auto& x: v) {
      if (!fst) res += sep;
      fst = 0; res += ts(x);
    }
    return res;
  }
  tcT> typename enable_if<needs_output_v<T>,str>::type ts(T v) {
    return "{"+ts_sep(v,", ")+"}"; }
 
  // for nested DS
  template<int, class T> typename enable_if<!needs_output_v<T>,vs>::type 
    ts_lev(const T& v) { return {ts(v)}; }
  template<int lev, class T> typename enable_if<needs_output_v<T>,vs>::type 
    ts_lev(const T& v) {
    if (lev == 0 || !sz(v)) return {ts(v)};
    vs res;
    for (const auto& t: v) {
      if (sz(res)) res.bk += ",";
      vs tmp = ts_lev<lev-1>(t);
      res.ins(end(res),all(tmp));
    }
    F0R(i,sz(res)) {
      str bef = " "; if (i == 0) bef = "{";
      res[i] = bef+res[i];
    }
    res.bk += "}";
    return res;
  }
}
 
inline namespace Output {
  template<class T> void pr_sep(ostream& os, str, const T& t) { os << ts(t); }
  template<class T, class... U> void pr_sep(ostream& os, str sep, const T& t, const U&... u) {
    pr_sep(os,sep,t); os << sep; pr_sep(os,sep,u...); }
  // print w/ no spaces
  template<class ...T> void pr(const T&... t) { pr_sep(cout,"",t...); } 
  // print w/ spaces, end with newline
  void ps() { cout << "\n"; }
  template<class ...T> void ps(const T&... t) { pr_sep(cout," ",t...); ps(); } 
  // debug to cerr
  template<class ...T> void dbg_out(const T&... t) {
    pr_sep(cerr," | ",t...); cerr << endl; }
  void loc_info(int line, str names) {
    cerr << "Line(" << line << ") -> [" << names << "]: "; }
  template<int lev, class T> void dbgl_out(const T& t) {
    cerr << "\n\n" << ts_sep(ts_lev<lev>(t),"\n") << "\n" << endl; }
  #ifdef LOCAL
    #define dbg(...) loc_info(__LINE__,#__VA_ARGS__), dbg_out(__VA_ARGS__)
    #define dbgl(lev,x) loc_info(__LINE__,#x), dbgl_out<lev>(x)
  #else // don't actually submit with this
    #define dbg(...) 0
    #define dbgl(lev,x) 0
  #endif
 
  const clock_t beg = clock();
  #define dbg_time() dbg((db)(clock()-beg)/CLOCKS_PER_SEC)
}
 
inline namespace FileIO {
  void setIn(str s)  { freopen(s.c_str(),"r",stdin); }
  void setOut(str s) { freopen(s.c_str(),"w",stdout); }
  void setIO(str s = "") {
    cin.tie(0)->sync_with_stdio(0); // unsync C / C++ I/O streams
    // cin.exceptions(cin.failbit);
    // throws exception when do smth illegal
    // ex. try to read letter into int
    if (sz(s)) setIn(s+".in"), setOut(s+".out"); // for old USACO
  }
}
 
int cnum = 0;
 
void inside(int x) {
  dbg("INSIDE", x);
  move_inside(x); ++cnum;
}
 
void outside(int x) {
  dbg("OUTSIDE", x);
  move_outside(x); --cnum;
}
 
int min_cardinality(int N) {
  vi rem;
  F0R(i,N) {
    inside(i);
    if (press_button() > 1) outside(i), rem.pb(i);
  }
  int d = cnum;
  while (true) {
    shuffle(all(rem), rng);
    assert(cnum%d == 0);
    const int start = cnum/d;
    int hi = sz(rem)/d;
    if (hi == 0) return start;
    int mid = (hi+1)/2;
    vi a, b;
    int ind = 0;
    for (int x: rem) {
      inside(x);
      if (press_button() > start+mid) {
        outside(x);
        b.pb(x);
      } else {
        a.pb(x);
      }
      ++ind;
      if (sz(a) + sz(rem) - ind < d*mid) {
        if (sz(a) == d*mid - 1) return start + mid - 1;
        for (int y: a) outside(y);
        FOR(i, ind, sz(rem)) a.pb(rem[i]);
        break;
      } else if (sz(a) == d*mid) {
        FOR(i, ind, sz(rem)) b.pb(rem[i]);
        break;
      } else {
        assert(ind < sz(rem));
      }
    }
    if (sz(a) == d*mid) { // [mid, hi]
      rem = b;
    } else { // [lo, mid)
      rem = a;
    }
  }
}

Compilation message (stderr)

insects.cpp: In function 'void inside(int)':
insects.cpp:237:22: warning: statement has no effect [-Wunused-value]
  237 |     #define dbg(...) 0
      |                      ^
insects.cpp:260:3: note: in expansion of macro 'dbg'
  260 |   dbg("INSIDE", x);
      |   ^~~
insects.cpp: In function 'void outside(int)':
insects.cpp:237:22: warning: statement has no effect [-Wunused-value]
  237 |     #define dbg(...) 0
      |                      ^
insects.cpp:265:3: note: in expansion of macro 'dbg'
  265 |   dbg("OUTSIDE", x);
      |   ^~~
insects.cpp: In function 'void FileIO::setIn(str)':
insects.cpp:246:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  246 |   void setIn(str s)  { freopen(s.c_str(),"r",stdin); }
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~
insects.cpp: In function 'void FileIO::setOut(str)':
insects.cpp:247:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  247 |   void setOut(str s) { freopen(s.c_str(),"w",stdout); }
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 75 / 75