Submission #533344

#	Time	Username	Problem	Language	Result	Execution time	Memory
533344		alextodoran	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	349 ms	20888 KiB

bobek

/**
 ____ ____ ____ ____ ____
||a |||t |||o |||d |||o ||
||__|||__|||__|||__|||__||
|/__\|/__\|/__\|/__\|/__\|

**/

#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N_MAX = 40;

int N; ll M;
ll A[N_MAX + 2];

vector <ll> getAll (int l, int r) {
    vector <ll> ret;
    for (int mask = 0; mask < (1 << (r - l + 1)); mask++) {
        ll sum = 0;
        for (int i = 0; i < r - l + 1; i++) {
            if ((mask >> i) & 1) {
                sum += A[l + i];
            }
        }
        ret.push_back(sum);
    }
    return ret;
}

int main () {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    cin >> N >> M;
    for (int i = 1; i <= N; i++) {
        cin >> A[i];
    }
    vector <ll> lv = getAll(1, N / 2);
    vector <ll> rv = getAll(N / 2 + 1, N);
    sort(lv.begin(), lv.end());
    sort(rv.begin(), rv.end());
    ll answer = 0;
    for (int l = 0, r = (int) rv.size() - 1; l < (int) lv.size(); l++) {
        while (r >= 0 && lv[l] + rv[r] > M) {
            r--;
        }
        answer += r - 0 + 1;
    }
    cout << answer << "\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