Submission #1121828

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121828		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	433 ms	20908 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
# define int long long
const int maxn = 1e6 + 5;

void solve()
{
    int n, k, cnt = 0;
    cin >> n >> k;
    vector < int > a(n);
    vector < int > pr1;
    vector < int > pr2;
    vector < int > p;
    vector < int > q;
    for(int i = 0; i < n; i++)
        cin >> a[i];
    for(int i = 0; i < n / 2 + (n % 2); i++)
        pr1.push_back(a[i]);
    for(int i = n / 2 + (n % 2); i < n; i++)
        pr2.push_back(a[i]);
    for(int i = 0; i < pow(2, pr1.size()); i++)
    {
        int ans = 0;
        for(int j = 0; j < pr1.size(); j++)
        {

            if(i & (1 << j))
            {
                ans += pr1[j];
            }
        }
        p.push_back(ans);
    }
    for(int i = 0; i < pow(2, pr2.size()); i++)
    {
        int ans = 0;
        for(int j = 0; j < pr2.size(); j++)
        {
            if(i & (1 << j))
                ans += pr2[j];
        }
        q.push_back(ans);
    }
    sort(q.begin(), q.end());
    for(int i = 0; i < p.size(); i++)
    {
        int chk = k - p[i];
        int l = 0, r = q.size() - 1;
        if(q[0] > chk)  continue;

        int ans = upper_bound(q.begin(), q.end(), chk) - q.begin();
        cnt += (ans);
    }
    cout << cnt << endl;
}

signed main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    int tt = 1;
    // cin >> tt;
    while(tt--)
        solve();
}

Compilation message (stderr)

bobek.cpp: In function 'void solve()':
bobek.cpp:24:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   24 |         for(int j = 0; j < pr1.size(); j++)
      |                        ~~^~~~~~~~~~~~
bobek.cpp:37:26: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         for(int j = 0; j < pr2.size(); j++)
      |                        ~~^~~~~~~~~~~~
bobek.cpp:45:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |     for(int i = 0; i < p.size(); i++)
      |                    ~~^~~~~~~~~~
bobek.cpp:48:13: warning: unused variable 'l' [-Wunused-variable]
   48 |         int l = 0, r = q.size() - 1;
      |             ^
bobek.cpp:48:20: warning: unused variable 'r' [-Wunused-variable]
   48 |         int l = 0, r = q.size() - 1;
      |                    ^

• 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