Submission #738632

#	Time	Username	Problem	Language	Result	Execution time	Memory
738632		bgnbvnbv	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	305 ms	20840 KiB

bobek

#include<bits/stdc++.h>
#define TASKNAME "codeforce"
#define pb push_back
#define pli pair<int,int>
#define fi first
#define se second
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL);
using namespace std;
using ll=long long;
const ll maxN=2e5;
const ll inf=1e18;
const ll mod=1e9+7;
ll n,m,a[maxN];
vector<ll>vec1,vec2;
void solve()
{
    cin >> n >> m;ll ans=0;
    for(int i=1;i<=n;i++) cin >> a[i];
    ll k=n/2;
    for(int mask=0;mask<(1<<k);mask++)
    {
        ll sum=0;
        for(int i=0;i<k;i++)
        {
            if(mask>>i&1)
            {
                sum+=a[i+1];
            }
        }
        vec1.pb(sum);
    }
    for(int mask=0;mask<(1<<(n-k));mask++)
    {
        ll sum=0;
        for(int i=0;i<n-k;i++)
        {
            if(mask>>i&1)
            {
                sum+=a[i+k+1];
            }
        }
        vec2.pb(sum);
    }
    sort(vec1.begin(),vec1.end());
    sort(vec2.begin(),vec2.end());
    ll j=0;
    for(int i=vec1.size()-1;i>=0;i--)
    {
        while(j<vec2.size()&&vec2[j]+vec1[i]<=m) j++;
        ans+=j;
    }
    cout << ans;
}
int main()
{
    fastio
    //freopen(TASKNAME".INP","r",stdin);
    //freopen(TASKNAME".OUT","w",stdout);
    solve();
}

Compilation message (stderr)

bobek.cpp: In function 'void solve()':
bobek.cpp:49:16: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   49 |         while(j<vec2.size()&&vec2[j]+vec1[i]<=m) j++;
      |               ~^~~~~~~~~~~~

• 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