Submission #854995

#	Time	Username	Problem	Language	Result	Execution time	Memory
854995		tvladm2009	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	340 ms	21940 KiB

bobek

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
const int N = 40 + 7;
ll a[N];
ll n, x;

signed main() {
#ifdef ONPC
  freopen ("input.txt", "r", stdin);
#else
  ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#endif // ONPC

  cin >> n >> x;
  for (int i = 1; i <= n; i++) {
    cin >> a[i];
  }
  int half1 = (n + 1) / 2;
  int half2 = n - half1;
  vector<ll> v1, v2;
  for (int mask = 0; mask < (1 << half1); mask++) {
    ll s = 0;
    for (int b = 0; b < half1; b++) {
      if (mask & (1 << b)) {
        s += a[b + 1];
      }
    }
    v1.push_back(s);
  }
  for (int mask = 0; mask < (1 << half2); mask++) {
    ll s = 0;
    for (int b = 0; b < half2; b++) {
      if (mask & (1 << b)) {
        s += a[half1 + b + 1];
      }
    }
    v2.push_back(s);
  }
  sort(v1.begin(), v1.end());
  sort(v2.begin(), v2.end());
  ll print = 0;
  for (auto &it : v1) {
    int low = 0, high = (int) v2.size() - 1, sol = -1;
    while (low <= high) {
      int mid = (low + high) / 2;
      if (v2[mid] <= x - it) {
        low = mid + 1;
        sol = mid;
      } else {
        high = mid - 1;
      }
    }
    print += sol + 1;
  }
  cout << print << "\n";
  return 0;
}

• 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