Submission #1121494

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121494		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	319 ms	21160 KiB

bobek

#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define vi vector<int>
#define vl vector<ll>
#define all(v) v.begin(), v.end()
#define pb push_back
#define f first
#define s second
#define pii pair<int, int>
#define pll pair<ll, ll>
using namespace std;
int main()
{
    ll n, m, i, j, ans = 0, sum = 0;
    cin >> n >> m;
    vl v(n), v1, v2, x, y;
    for(i = 0; i < n; i++)
    {
        cin >> v[i];
        if(i < (n + 1) / 2)
            v1.pb(v[i]);
        else
            v2.pb(v[i]);
    }
    ll a = v1.size(), b = v2.size();
    for(i = 0; i < 1 << a; i++)
    {
        sum = 0;
        for(j = 0; j < a; j++)
        {
            if((i >> j) & 1)
                sum += v1[j];
        }
        x.pb(sum);
    }
    for(i = 0; i < 1 << b; i++)
    {
        sum = 0;
        for(j = 0; j < b; j++)
        {
            if((i >> j) & 1)
                sum += v2[j];
        }
        y.pb(sum);
    }
    sort(all(x));
    sort(all(y));
    for(i = 0; i < x.size(); i++)
    {
        ll u = upper_bound(all(y), m - x[i]) - y.begin();
        ans += u;
    }
    cout << ans << "\n";
}

Compilation message (stderr)

bobek.cpp: In function 'int main()':
bobek.cpp:49:18: 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]
   49 |     for(i = 0; i < x.size(); i++)
      |                ~~^~~~~~~~~~

• 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