Submission #867390

#	Time	Username	Problem	Language	Result	Execution time	Memory
867390		Muhammad_Aneeq	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	363 ms	16860 KiB

bobek

/*
بسم الله الرحمن الرحيم
Author:
                          (:Muhammad Aneeq:)
*/
#pragma GCC optimize("O2")
#pragma GCC optimize("Ofast")
#pragma GCC target("avx,avx2,fma")
#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
#define int long long
inline void solve()
{
  int n,K;
  cin>>n>>K;
  int a[n];
  for (auto& i:a)
    cin>>i;
  vector<int>x((1<<(n/2))),y(1<<(n-n/2));
  for (int i=0;i<=x.size();++i)
  {
    int z=0;
    for (int j=0;j<n/2;j++)
    {
      if ((1<<j)&i)
        z+=a[j];
    }
    x[i]=z;
  }
  for (int i=0;i<=y.size();i++)
  {
    int z=0;
    for (int j=0;j<n-n/2;j++)
    {
      if ((1<<j)&i)
        z+=a[n/2+j];
    }
    y[i]=z;
  } 
  sort(x.begin(), x.end());
  int ans=0;
  for (auto i:y)
  {
    int z=upper_bound(x.begin(), x.end(),K-i)-begin(x);
    ans+=z;
  }
  cout<<ans<<endl;
}
signed main()
{
  ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
        solve();
}

Compilation message (stderr)

bobek.cpp: In function 'void solve()':
bobek.cpp:22:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   22 |   for (int i=0;i<=x.size();++i)
      |                ~^~~~~~~~~~
bobek.cpp:32:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   32 |   for (int i=0;i<=y.size();i++)
      |                ~^~~~~~~~~~

• 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