Submission #1005104

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005104		Essa2006	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	316 ms	16864 KiB

bobek

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define endl '\n'
#define FF first
#define SS second
#define all(a) a.begin(), a.end()
#define mod (ll)(1000000007)

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

    int n;
    ll m;
    cin >> n >> m;

    vector<ll> C(n);
    for (int i = 0; i < n; i++) {
        cin >> C[i];
    }

    array<int, 2> sz = {n / 2, (n + 1) / 2};
    array<vector<ll>, 2> A;
    A[0].clear(), A[1].clear();
    A[0].reserve(1 << 20), A[1].reserve(1 << 20);

    for (int j = 0; j < 2; j++) {
        int shift = (j ? sz[j - 1] : 0);

        for (int msk = 1; msk < (1 << sz[j]); msk++) {

            int cur = msk;
            A[j].push_back(C[__builtin_ctz (msk) + shift]);
            cur = cur & (cur - 1);
            while (cur) {
                A[j].back() += (C[__builtin_ctz(cur) + shift]);
                cur = cur & (cur - 1);
            }

        }

    }
    sort(all(A[1]));
    A[0].push_back(0);

    ll ans = 0;
    for (int i = 0; i < A[0].size(); i++) {
        if (A[0][i] > m) {
            continue;
        }
        ans++;
        int ind = upper_bound(all(A[1]), m - A[0][i]) - A[1].begin();
        ans += ind;
    }
    cout << ans;
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:47:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     for (int i = 0; i < A[0].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