Submission #170977

#	Time	Username	Problem	Language	Result	Execution time	Memory
170977		reda	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	579 ms	21060 KiB

bobek

#include<bits/stdc++.h>
#define endl '\n'
#define pii pair<int,int>
#define fi first
#define se second
#define ll long long 
#define pb push_back
#define all(x) x.begin(),x.end()
#pragma GCC optimize ("Ofast","unroll-loops")
using namespace std;
const int MOD = 1e9+7;
const int MAXN = 50;
ll  ans  = 0 ;
ll  n, m ;
void solve(ll idx  ,  ll  sum , vector<ll> arr ,  vector<ll> &v  )
{
    if(idx==arr.size() )
    {
    if(sum<=m)v.push_back(sum);
    	return ; 
    }
    solve(idx+1,sum,arr,v);
    solve(idx+1,sum+arr[idx],arr,v);
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    cin >> n >> m ;
    vector<ll> a , b ;
    for(ll  i=1;i<=n;i++)
    {
    	ll x;
    	cin >> x ; 
    	if(i%2==0)
    	{
    	  a.push_back(x);
    	}
    	else
    	{
    	  b.push_back(x);
    	}
    }
    vector<ll> v1,v2;
    solve(0,0,a,v1);
    solve(0,0,b,v2);
    sort(all(v1));
    sort(all(v2));
    for(auto  it : v1)
    {
    	 ll l = 0 ;
    	 ll  r= v2.size()-1;
    	 ll  x = -1 ;
    	 while (l<=r)
    	 {
    	 	ll mid =(l+r)>>1;
    	 	if(v2[mid]+it<=m)
    	 	{
    	 		x=mid;
    	 		l=mid+1;
    	 	}
    	 	else r= mid-1;
    	 }
    	 if(x!=-1)ans+=(x+1);
    }
    cout<<ans<<endl;
    return 0 ;
}

Compilation message (stderr)

bobek.cpp: In function 'void solve(long long int, long long int, std::vector<long long int>, std::vector<long long int>&)':
bobek.cpp:17:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(idx==arr.size() )
        ~~~^~~~~~~~~~~~

• 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