Submission #803413

#	Time	Username	Problem	Language	Result	Execution time	Memory
803413		raysh07	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	194 ms	25004 KiB

bobek

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define INF (int)1e18
#define f first
#define s second
 
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
 
vector <int> gen(vector <int> a){
    
    if (a.size() == 0){
        vector <int> res;
        res.push_back(0);
        return res;
    }
    
    int x = a.back();
    a.pop_back();
    vector <int> v = gen(a);
    auto res = v;
    for (auto y : v){
        res.push_back(y + x);
    }
    
    return res;
}
 
void Solve() 
{
    int n, m; cin >> n >> m;
    
    vector <int> a, b;
    for (int i = 0; i < n; i++){
        int x; cin >> x;
        if (i < 20){
            a.push_back(x);
        } else {
            b.push_back(x);
        }
    }
    
    vector <int> v1 = gen(a);
    vector <int> v2 = gen(b);
    
    sort(v1.begin(), v1.end());
    sort(v2.begin(), v2.end());
    int ptr = 0;
    int ans = 0;
    reverse(v1.begin(), v1.end());
    
    for (auto x : v1){
        while (ptr != v2.size() && x + v2[ptr] <= m){
            ptr++;
        }
        
        ans += ptr;
    }
    
    cout << ans << "\n";
}
 
int32_t main() 
{
    auto begin = std::chrono::high_resolution_clock::now();
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    int t = 1;
//    cin >> t;
    for(int i = 1; i <= t; i++) 
    {
        //cout << "Case #" << i << ": ";
        Solve();
    }
    auto end = std::chrono::high_resolution_clock::now();
    auto elapsed = std::chrono::duration_cast<std::chrono::nanoseconds>(end - begin);
    cerr << "Time measured: " << elapsed.count() * 1e-9 << " seconds.\n"; 
    return 0;
}

Compilation message (stderr)

bobek.cpp: In function 'void Solve()':
bobek.cpp:53:20: 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]
   53 |         while (ptr != v2.size() && x + v2[ptr] <= m){
      |                ~~~~^~~~~~~~~~~~

• 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