Submission #1121760

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121760		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	433 ms	22964 KiB

bobek

// Author: RufatM
#include <bits/stdc++.h>
using namespace std;
#define MOD 1000000007
#define INF 1e9+7
#define ll long long
#define ull unsigned long long
#define vi vector<int>
#define vii vector<vector<int>>
#define mii map<int,int>
#define pb push_back
#define pii pair<ll,int>
#define all(a) a.begin(), a.end()
#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
signed main() {
    fastio;
    int t = 1;
    // cin >> t;
    while (t--) {
        int N;
        ll M;
        cin >> N >> M;
        vector<ll> cost(N);
        for (int i = 0; i < N;i++) cin >> cost[i];
        int n1 = N / 2, n2 = N - n1;
        vector<ll> left, right;
        for (int mask = 0; mask < (1 << n1); mask++) {
            ll sum = 0;
            for (int i = 0; i < n1; ++i) {
                if (mask & (1 << i)) sum += cost[i];
            }
            left.pb(sum);
        }
        for (int mask = 0; mask < (1 << n2);mask++) {
            ll sum = 0;
            for (int i = 0; i < n2; ++i) {
                if (mask & (1 << i)) sum += cost[n1 + i];
            }
            right.pb(sum);
        }
        sort(all(right));
        ll total = 0;
        for (ll s : left) {
            if (s > M) continue;
            ll rem = M - s;
            ll cnt = upper_bound(all(right), rem) - right.begin();
            total += cnt;
        }
        cout << total << '\n';
    }
}

• 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