Submission #1005090

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005090		milisav	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	315 ms	16872 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};
        vector<vector<ll>> A(2);
        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_ctzll (msk) + shift]);
                cur = cur & (cur - 1);
                while (cur) {
                    A[j].back() += (C[__builtin_ctzll(cur)  + shift]);
                    cur = cur & (cur - 1);
                }
            }
        }


        ll ans = 0;

        sort(all(A[1]));
        A[0].push_back(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:45:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |         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