Submission #679890

#	Time	Username	Problem	Language	Result	Execution time	Memory
679890		peijar	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	189 ms	16736 KiB

bobek

#include <bits/stdc++.h>
#define int long long
using namespace std;

namespace std {
template <typename T> ostream &operator<<(ostream &out, const vector<T> &vec) {
  out << "[";
  for (int i = 0; i < (int)vec.size(); ++i) {
    out << vec[i];
    if (i + 1 < (int)vec.size())
      out << ", ";
  }
  return out << "]";
}
} // namespace std

void dbg_out() { cout << endl; }
template <typename Head, typename... Tail> void dbg_out(Head H, Tail... T) {
  cout << ' ' << H;
  dbg_out(T...);
}

#ifdef DEBUG
#define dbg(...) cout << "(" << #__VA_ARGS__ << "):", dbg_out(__VA_ARGS__)
#else
#define dbg(...)
#endif

signed main(void) {
  ios_base::sync_with_stdio(false);
  cin.tie(0);

  int N, budget;
  cin >> N >> budget;
  vector<int> L, R;
  for (int i = 0; i < N; ++i) {
    int x;
    cin >> x;
    if (i % 2)
      R.push_back(x);
    else
      L.push_back(x);
  }

  int szL = L.size(), szR = R.size();
  vector<int> valL(1 << szL), valR(1 << szR);
  for (int msk = 0; msk < (1 << szL); ++msk) {
    for (int i = 0; i < szL; ++i)
      if ((1 << i) & msk) {
        valL[msk] = valL[msk ^ (1 << i)] + L[i];
        break;
      }
  }
  sort(valL.begin(), valL.end());
  for (int msk = 0; msk < (1 << szR); ++msk) {
    for (int i = 0; i < szR; ++i)
      if ((1 << i) & msk) {
        valR[msk] = valR[msk ^ (1 << i)] + R[i];
        break;
      }
  }
  dbg(L, R);
  sort(valR.rbegin(), valR.rend());
  dbg(valL);
  dbg(valR);
  int curL = 0;
  int sol = 0;
  for (int x : valR) {
    if (x > budget)
      continue;
    while (curL < (int)valL.size() and valL[curL] + x <= budget)
      ++curL;
    dbg(x, curL);
    sol += curL;
  }
  cout << sol << endl;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10