Submission #1121620

#	Time	Username	Problem	Language	Result	Execution time	Memory
1121620		vjudge1	Ice Hockey World Championship (CEOI15_bobek)	C++17	100 / 100	755 ms	69136 KiB

bobek

#include <bits/stdc++.h>

// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define int long long
#define ll long long
#define pii pair<int, int>
#define all(v) v.begin(), v.end()
using namespace std;
const int oo = 1e18 + 9;
const int MAX = 3e5 + 5, LOGMAX = 20, B = 441, MOD = 998244353;

void solve(){
    int n, m; cin >> n >> m;
    int arr[n + 1];
    for(int i = 0; i < n; i++){
        cin >> arr[i];
    }    
    unordered_map<int, int> mp;
    int p1 = n / 2;
    int p2 = n - p1;
    for(int mask = 0; mask < (1 << p1); mask++){
        int sum = 0;
        for(int i = 0; i < p1; i++){
            if((1 << i) & mask) sum += arr[i];
        }
        mp[sum]++;
    }
    vector<pii> v;
    for(auto a : mp){
        v.push_back(a);
    }
    sort(v.begin(), v.end());
    int p = 0;
    for(pii &a : v){
        p += a.second;
        a.second = p;
    }
    int ans = 0;
    for(int mask = 0; mask < (1 << p2); mask++){
        int sum = 0;
        for(int i = 0; i < p2; i++){
            if((1 << i) & mask) sum += arr[p1 + i];
        }
        if(sum > m) continue;
        ans += (upper_bound(all(v), make_pair(m - sum, oo)) - 1)->second;
    }
    cout << ans << '\n';
}   

signed main(){
    ios::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
    int t = 1;
    // cin >> t;
    while(t--) solve();
}

• 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