Submission #868135

#	Time	Username	Problem	Language	Result	Execution time	Memory
868135		Cookie	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	176 ms	22212 KiB

bobek

#include<bits/stdc++.h>
#include<fstream>
using namespace std;
ifstream fin("HCN.INP");
ofstream fout("HCN.OUT");
#define sz(a) (int)a.size()
#define ll long long
#define pb push_back
#define forr(i, a, b) for(int i = a; i < b; i++)
#define dorr(i, a, b) for(int i = a; i >= b; i--)
#define ld long double
#define vt vector
#include<fstream>
#define fi first
#define se second
#define pll pair<ll, ll>
#define pii pair<int, int>
const ld PI = 3.14159265359;
//using u128 = __uint128_t;
//const int x[4] = {1, -1, 0, 0};
//const int y[4] = {0, 0, 1, -1};
const ll mod = 1e9 + 9;
const int mxn = 1e5 + 5, mxq = 2e5 + 5, sq = 200, mxv = 2e6 + 5;
const ll inf = 1e17 + 5;
//const int base= (1 << 18);
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
int n; ll m;
ll a[45];
vt<ll>two, one;
void solve(int l, int r, ll sm){
    if(l > r){
        if(r == n)two.pb(sm);
        else one.pb(sm);
        return;
    }
    solve(l + 1, r, sm + a[l]); solve(l + 1, r, sm);
}
signed main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    cin >> n >> m;
    for(int i = 1; i <= n; i++)cin >> a[i];
    int nn = n / 2;
    solve(1, nn, 0); solve(nn + 1, n, 0);
    sort(one.begin(), one.end()); sort(two.begin(), two.end());
    ll ans = 0, r = 0;
    for(int i = sz(one) - 1; i >= 0; i--){
        while(r < sz(two) && two[r] + one[i] <= m)r++;
        ans += r;
    }
    cout << ans;
    return(0);
}

• 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