Submission #1254382

#	Time	Username	Problem	Language	Result	Execution time	Memory
1254382		nvc2k8	Ice Hockey World Championship (CEOI15_bobek)	C++20	100 / 100	390 ms	8644 KiB

bobek

#include <bits/stdc++.h>
#define TASK "aksjdkasjd"
#define endl '\n'
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define BIT(i,x) (((i)>>(x))&1)
#define FOR(i,a,b) for(int i = (a); i<=(b); i++)
#define FORD(i,a,b) for(int i = (a); i>=(b); i--)
#define all(C) C.begin(), C.end()
using namespace std;
using ll = long long;
using pii = pair<int,int>;
const int INT_LIM = 2147483647;
const ll LL_LIM = 9223372036854775807;
template <typename X> bool minimize(X &x, const X &y) {if (x>y){x = y; return true;}return false;}
template <typename X> bool maximize(X &x, const X &y) {if (x<y){x = y; return true;}return false;}
///------------------------------------------///
int n;
ll m;
ll a[45];

void inp()
{
    cin >> n >> m;
    FOR(i, 1, n) cin >> a[i];
}

int c;
ll f[1<<20];

int findl(ll x)
{
    int l = 0, r = (1<<c)-1, ret = -1;
    while(l<=r)
    {
        int mid = (l+r)>>1;
        if (f[mid]<=x)
        {
            ret = mid;
            l = mid+1;
        }
        else r = mid-1;
    }

    return ret+1;
}

ll ans = 0;

void solve()
{
    c = (n+1)/2;
    FOR(mask, 0, (1<<c)-1)
    {
        FOR(i, 1, c) if (BIT(mask, i-1)) f[mask]+= a[i];
    }
    sort(f, f+(1<<c));

    FOR(mask, 0, (1<<(n-c))-1)
    {
        ll sum = 0;
        FOR(i, c+1, n) if (BIT(mask, i-(c+1))) sum+= a[i];
        if (sum<=m)
        {
            ans+= findl(m-sum);
        }
    }
    cout << ans << endl;
}

signed main()
{
    ///--------------------------///
    ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
    if (fopen(TASK".INP","r")!=NULL)
    {
        freopen(TASK".INP","r",stdin);
        freopen(TASK".OUT","w",stdout);
    }
    ///--------------------------///

    int NTEST = 1;
    bool codeforces = 0;
    if (codeforces) cin >> NTEST;

    while (NTEST--)
    {
        inp();
        solve();
    }

    return 0;
}

///------------------------------------------///

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:79:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   79 |         freopen(TASK".INP","r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
bobek.cpp:80:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |         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