Submission #864144

#	Time	Username	Problem	Language	Result	Execution time	Memory
864144		wii	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	423 ms	10700 KiB

bobek

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

typedef double db;
typedef long long ll;
typedef long double ld;

#define int ll
typedef pair<int, int> pii;

#define X first
#define Y second
#define gcd __gcd
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define bit(i, mask) ((mask) >> (i) & 1)
#define reset(x, val) memset(x, val, sizeof(x))
#define foru(i,a,b) for(int i = (a); i <= (b); ++i)
#define ford(i,a,b) for(int i = (a); i >= (b); --i)
#define FastIO ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);

template<typename T> bool maximize(T &res, const T &val) { if (res < val) { res = val; return true; } return false; }
template<typename T> bool minimize(T &res, const T &val) { if (val < res) { res = val; return true; } return false; }

const ll Linf = 0x3f3f3f3f3f3f3f3f;
const int Inf = 0x3f3f3f3f;
const ll Mod = 1e9 + 7;
const ll Mod2 = ll(1e9) + 9;
const int Lim = 1e6 + 5;
const int inv6 = 166666668;

/// ====*====*====*====*====*====*====*====*====*====*====*====*====*====*====*====*====

const int base = 3;
const int N = 40 + 2;
const int K = log2(N);
const int dx[] = {+1, -1, 0, 0};
const int dy[] = {0, 0, +1, -1};
const int block_size = sqrt(2e9) + 2;

int n, m;
int a[N];
vector<int> lf;

void solve() {
    cin >> n >> m;
    foru(i, 1, n) cin >> a[i];

    int mid = (n >> 1) + (n & 1);
    for (int mask = 0; mask < (1LL << mid); ++mask) {
        int sum = 0;
        foru(i, 1, mid) if (mask >> i - 1 & 1) sum += a[i];
        lf.pb(sum);
    }
    sort(all(lf));

    int ans = 0;
    for (int mask = 0; mask < (1LL << n - mid); ++mask) {
        int sum = 0;
        foru(i, mid + 1, n) if (mask >> i - mid - 1 & 1) sum += a[i];

        ans += upper_bound(all(lf), m - sum) - lf.begin();
    }

    cout << ans;
}

signed main() {
    FastIO;

    #define task "test"
    if (fopen(task".inp", "r")) {
		freopen(task".inp", "r", stdin);
		freopen(task".out", "w", stdout);
	}

    int ntest = 1;
    // cin >> ntest;
    while (ntest--) {
        //cout << "Case " << q << ": " << "\n"; 
        solve();
        cout << "\n";
    }

    return 0;
}

/**  /\_/\
 *  (= ._.)
 *  / >TL \>AC
**/

Compilation message (stderr)

bobek.cpp: In function 'void solve()':
bobek.cpp:52:39: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   52 |         foru(i, 1, mid) if (mask >> i - 1 & 1) sum += a[i];
      |                                     ~~^~~
bobek.cpp:58:41: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   58 |     for (int mask = 0; mask < (1LL << n - mid); ++mask) {
      |                                       ~~^~~~~
bobek.cpp:60:49: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
   60 |         foru(i, mid + 1, n) if (mask >> i - mid - 1 & 1) sum += a[i];
      |                                         ~~~~~~~~^~~
bobek.cpp: In function 'int main()':
bobek.cpp:73:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   freopen(task".inp", "r", stdin);
      |   ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bobek.cpp:74:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |   freopen(task".out", "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