Submission #1054087

#	Time	Username	Problem	Language	Result	Execution time	Memory
1054087		otarius	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	305 ms	10656 KiB

bobek

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

// #pragma GCC optimize("Ofast")
// #pragma GCC optimize ("unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define ff first
#define sc second
#define pb push_back
#define ll long long
#define pll pair<ll, ll>
#define pii pair<int, int>
#define ull unsigned long long
#define all(x) (x).begin(),(x).end()

#define int long long
// #define int unsigned long long

// #define ordered_set(T) tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>
// #define ordered_multiset(T) tree<T, null_type, less_equal<T>, rb_tree_tag, tree_order_statistics_node_update>

void open_file(string filename) {
    freopen((filename + ".in").c_str(), "r", stdin);
    freopen((filename + ".out").c_str(), "w", stdout);
}

// const ll mod = 1e9 + 7;
// const ll mod = 998244353;

const ll inf = 1e9;
const ll biginf = 1e18;
// const int maxN;

void solve() {
    int n, mx;
    cin >> n >> mx;
    int arr[n + 1];
    for (int i = 1; i <= n; i++)
        cin >> arr[i];
    vector<int> a, b, sums;
    for (int i = 1; i <= n / 2; i++)
        a.push_back(arr[i]);
    for (int i = n / 2 + 1; i <= n; i++)
        b.push_back(arr[i]);
    int m = a.size(); ll cur;
    for (int i = 0; i < (1 << m); i++) {
        cur = 0;
        for (int j = 0; j < m; j++) {
            if (i & (1 << j)) cur += a[j];
            if (cur > mx) break;
        } if (cur <= mx)
            sums.push_back(cur);
    } sort(sums.begin(), sums.end());
    m = b.size(); ll ans = 0;
    for (int i = 0; i < (1 << m); i++) {
        cur = 0;
        for (int j = 0; j < m; j++) {
            if (i & (1 << j)) cur += b[j];
            if (cur > mx) break;
        } ans += lower_bound(sums.begin(), sums.end(), mx - cur + 1) - sums.begin();
    } cout << ans;
}
int32_t main() { 
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr); cout.tie(nullptr);
    
    int t = 1;
    // cin >> t;
    while (t--) {
        solve();
        cout << '\n';
    }
    return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'void open_file(std::string)':
bobek.cpp:26:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   26 |     freopen((filename + ".in").c_str(), "r", stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bobek.cpp:27:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   27 |     freopen((filename + ".out").c_str(), "w", stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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