Submission #1083508

#	Time	Username	Problem	Language	Result	Execution time	Memory
1083508		TrinhKhanhDung	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	304 ms	21260 KiB

bobek

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define se second
#define sz(x) (int)x.size()
#define ALL(v) v.begin(),v.end()
#define MASK(k) (1LL << (k))
#define BIT(x, i) (((x) >> (i)) & 1)
#define oo (ll)1e18
#define INF (ll)1e9
#define MOD (ll)(1e9 + 7)

using namespace std;

template<class T1, class T2>
    bool maximize(T1 &a, T2 b){if(a < b){a = b; return true;} return false;}

template<class T1, class T2>
    bool minimize(T1 &a, T2 b){if(a > b){a = b; return true;} return false;}

template<class T1, class T2>
    void add(T1 &a, T2 b){a += b; if(a >= MOD) a -= MOD;}

template<class T1, class T2>
    void sub(T1 &a, T2 b){a -= b; if(a < 0) a += MOD;}

template<class T>
    void cps(T &v){sort(ALL(v)); v.resize(unique(ALL(v)) - v.begin());}

void solve(){
    int n; cin >> n;
    ll m; cin >> m;
    vector<ll> a, b;
    for(int i=1; i<=n; i++){
        ll u; cin >> u;
        if(i * 2 <= n) a.push_back(u);
        else b.push_back(u);
    }
    vector<ll> s1, s2;
    for(int mask=0; mask<MASK(sz(a)); mask++){
        ll sum = 0;
        for(int i=0; i<sz(a); i++) if(BIT(mask, i)){
            sum += a[i];
        }
        s1.push_back(sum);
    }
    for(int mask=0; mask<MASK(sz(b)); mask++){
        ll sum = 0;
        for(int i=0; i<sz(b); i++) if(BIT(mask, i)){
            sum += b[i];
        }
        s2.push_back(sum);
    }
    sort(ALL(s1));
    sort(ALL(s2));
    ll ans = 0;
    for(ll x: s1){
        ll p = upper_bound(ALL(s2), m - x) - s2.begin();
        ans += p;
    }
    cout << ans << '\n';
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    // freopen("task.inp", "r", stdin);
    // freopen("task.out", "w", stdout);

    int t = 1;
//    cin >> t;
    while(t--){
        solve();
    }

    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