Submission #973663

#	Time	Username	Problem	Language	Result	Execution time	Memory
973663		nguyentunglam	Shopping (JOI21_shopping)	C++17	0 / 100	31 ms	28140 KiB

Anna

#include "Anna.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std;


namespace {

const int M = 18;
int cnt, n, l, r;

int from, to, ed, ans;

stack<int> st;

vector<int> lst, bit;

int x = -1, y = -1;

int p = 0, mn = 0;

vector<pair<int, int> > arr[20];

int phase = 0;

void build(int d, int l, int r) {
  arr[d].emplace_back(l, r);
  if (l != r) {
    int mid = l + r >> 1;
    build(d + 1, l, mid);
    build(d + 1, mid + 1, r);
  }
}
}  // namespace


void InitA(int N, int ll, int rr) {
  n = N;
  l = ll;
  r = rr;
  build(0, 0, n - 1);
  for(int depth = 14; depth >= 0; depth--) {
    int cover = -1;
    for(int i = 0; i < arr[depth].size(); i++) {
      int L, R; tie(L, R) = arr[depth][i];
      if (L <= l && r <= R) {
        cover = i;
        x = L;
        y = R;
      }
    }
    if (cover == -1) continue;
    for(int i = 0; i < 4; i++) SendA(depth >> i & 1), cnt++;
    for(int i = 0; i < depth; i++) SendA(cover >> i & 1), cnt++;
    assert((1 << depth) > cover);
    break;
  }

  assert(x >= 0);
  from = to = x + y >> 1;
  assert(from >= l && to <= r);
  while (cnt < M) {
    int delta = (y - to + from - x + 1) / 2;
    int tmp;
    if (from - x >= delta) {
      tmp = from - delta;
      if (l <= tmp) {
        SendA(1);
        from = tmp;
      }
      else {
        SendA(0);
        x = from + 1;
      }
    }
    else {
      tmp = to + delta;
      if (tmp <= r) {
        SendA(1);
        to = tmp;
      }
      else {
        SendA(0);
        y = to - 1;
      }
    }
    cnt++;
  }
//  cout << from << " " << to << endl;
//  cout << x << " " << y << endl;
//  exit(0);
}

void ReceiveA(bool X) {
//  cerr << X << endl;
  if (phase == 0) bit.push_back(X);
  if (phase == 0 && bit.size() == 20) {
    for(int i = 0; i < 20; i++) if (bit[i]) mn |= (1 << i);

    for(int i = x; i < from; i++) lst.push_back(i);
    lst.push_back(mn);
    for(int i = to + 1; i <= y; i++) lst.push_back(i);
    ed = mn;
    for(int i = to + 1; i <= y; i++) if (i <= r) ed = i;
//    cout << lst.size() << endl;
//    cout << mn << endl;
//    exit(0);
    phase = 1;
  }
  else if (phase == 1) {
//    cout << ed << endl;
//    cout << X << endl;
//    exit(0);
    if (X == 0) st.pop();
    else {
      st.push(lst[p]);
//      cout << lst[p] << " " << ed << endl;
//      exit(0);
      if (lst[p] == ed) {
        ans = -1;
        while (!st.empty() && st.top() >= l) {
          ans = st.top();
          st.pop();
        }
        assert(ans >= 0);
//        cout << ans << endl;
//        exit(0);
        phase = 2;
      }
      p++;
    }
  }
}

int Answer() {
  return ans;
}

Bruno

#include "Bruno.h"
#include <vector>
#include<bits/stdc++.h>
using namespace std;

namespace {

const int N = 1e6 + 10, M = 18;
int n, cnt_anna;

int a[N];

int x, y, from, to;

int phase, depth;

vector<bool> bit;

vector<pair<int, int> > arr[20];

void build(int d, int l, int r) {
  arr[d].emplace_back(l, r);
  if (l != r) {
    int mid = l + r >> 1;
    build(d + 1, l, mid);
    build(d + 1, mid + 1, r);
  }
}

}  // namespace

void InitB(int N, std::vector<int> P) {
  n = N;
  for(int i = 0; i < n; i++) a[i] = P[i];
}

void ReceiveB(bool Y) {
  cnt_anna++;
  bit.push_back(Y);
  if (phase == 0 && bit.size() == 4) {
    depth = 0;
    for(int i = 0; i < 4; i++) if (bit[i]) depth |= (1 << i);
    bit.clear();
    phase = 1;
//    cout << depth << endl;
//    exit(0);
  }
  if (phase == 1 && bit.size() == depth) {
    build(0, 0, n - 1);
    int idx = 0;
    for(int i = 0; i < depth; i++) if (bit[i]) idx |= (1 << i);
    bit.clear();
    tie(x, y) = arr[depth][idx];
    from = to = x + y >> 1;
    phase = 2;
  }
  if (cnt_anna >= M) {
    for(int i = 0; i < bit.size(); i++) {
      int delta = (y - to + from - x + 1) / 2;
      int tmp;
      if (from - x >= delta) {
        tmp = from - delta;
        if (bit[i]) from = tmp;
        else x = from + 1;
      }
      else {
        tmp = to + delta;
        if (bit[i]) to = tmp;
        else y = to - 1;
      }
    }
//    cout << from << " " << to << " " << x << " " << y << endl;
//    exit(0);
    vector<int> lst;
    for(int i = x; i < from; i++) lst.push_back(a[i]);
    int mn = from;
    for(int i = from; i <= to; i++) if (a[i] < a[mn]) mn = i;
    for(int i = 0; i < 20; i++) SendB(mn >> i & 1);
    lst.push_back(a[mn]);
    for(int i = to + 1; i <= y; i++) lst.push_back(a[i]);
//    cout << lst.size() << endl;
//    exit(0);
    stack<int> st;
    for(int i = 0; i < lst.size(); i++) {
      while (!st.empty() && lst[st.top()] >= lst[i]) st.pop(), SendB(0);
      SendB(1);
      st.push(i);
    }
//    exit(0);
  }
}

Compilation message (stderr)

Anna.cpp: In function 'void {anonymous}::build(int, int, int)':
Anna.cpp:29:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   29 |     int mid = l + r >> 1;
      |               ~~^~~
Anna.cpp: In function 'void InitA(int, int, int)':
Anna.cpp:44:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   44 |     for(int i = 0; i < arr[depth].size(); i++) {
      |                    ~~^~~~~~~~~~~~~~~~~~~
Anna.cpp:60:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   60 |   from = to = x + y >> 1;
      |               ~~^~~

Bruno.cpp: In function 'void {anonymous}::build(int, int, int)':
Bruno.cpp:24:17: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   24 |     int mid = l + r >> 1;
      |               ~~^~~
Bruno.cpp: In function 'void ReceiveB(bool)':
Bruno.cpp:48:32: warning: comparison of integer expressions of different signedness: 'std::vector<bool>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   48 |   if (phase == 1 && bit.size() == depth) {
      |                     ~~~~~~~~~~~^~~~~~~~
Bruno.cpp:54:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   54 |     from = to = x + y >> 1;
      |                 ~~^~~
Bruno.cpp:58:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<bool>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   58 |     for(int i = 0; i < bit.size(); i++) {
      |                    ~~^~~~~~~~~~~~
Bruno.cpp:84:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |     for(int i = 0; i < lst.size(); i++) {
      |                    ~~^~~~~~~~~~~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 9
• Subtask 3: 0 / 90