Submission #850959

#	Time	Username	Problem	Language	Result	Execution time	Memory
850959		Nhoksocqt1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	314 ms	10704 KiB

bobek

#include<bits/stdc++.h>
using namespace std;

#define inf 0x3f3f3f3f
#define sz(x) int((x).size())
#define fi first
#define se second
typedef long long ll;
typedef pair<int, int> ii;

template<class X, class Y>
	inline bool maximize(X &x, const Y &y) {return (x < y ? x = y, 1 : 0);}
template<class X, class Y>
	inline bool minimize(X &x, const Y &y) {return (x > y ? x = y, 1 : 0);}

mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int Random(int l, int r) {
    return uniform_int_distribution<int>(l, r)(rng);
}

ll cost[40], m;
int nArr;

void process() {
    cin >> nArr >> m;
    for (int i = 0; i < nArr; ++i)
        cin >> cost[i];

    ll res(0);
    vector<ll> p;
    int n1 = min(nArr, 20), n2 = nArr - n1;
    for (int mask = 0; mask < (1 << n1); ++mask) {
        ll sum(0);
        for (int i1 = mask; i1 > 0; i1 ^= i1 & -i1) {
            int i = __builtin_ctz(i1 & -i1);
            sum += cost[i];
        }

        p.push_back(sum);
    }

    sort(p.begin(), p.end());
    for (int mask = 0; mask < (1 << n2); ++mask) {
        ll sum(0);
        for (int i1 = mask; i1 > 0; i1 ^= i1 & -i1) {
            int i = __builtin_ctz(i1 & -i1);
            sum += cost[20 + i];
        }

        int pos = upper_bound(p.begin(), p.end(), m - sum) - p.begin();
        res += pos;
    }

    cout << res << '\n';
}

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

    process();
    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