Submission #144884

#	Time	Username	Problem	Language	Result	Execution time	Memory
144884		12tqian	Ice Hockey World Championship (CEOI15_bobek)	C++14	100 / 100	417 ms	20952 KiB

bobek

#pragma comment(linker, "/stack:200000000")
//#pragma GCC optimize("Ofast")
//#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#pragma GCC optimize ("O3")
#pragma GCC target ("sse4")
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;
template <class T> using Tree = tree<T, null_type, less<T>, rb_tree_tag,tree_order_statistics_node_update>;

const double PI = 4 * atan(1);

#define sz(x) (int)(x).size()
#define ll long long
#define ld long double
#define mp make_pair
#define pb push_back
#define eb emplace_back
#define pii pair <int, int>
#define vi vector<int>
#define lb lower_bound
#define ub upper_bound
#define all(x) x.begin(), x.end()
#define vpi vector<pair<int, int>>
#define vpd vector<pair<double, double>>
#define pd pair<double, double>

#define f0r(i,a) for(int i=0;i<a;i++)
#define f1r(i,a,b) for(int i=a;i<b;i++)
#define trav(a, x) for (auto& a : x)

template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
  cout << "["; for(int i = 0; i < v.size(); i++) {if (i) cout << ", "; cout << v[i];} return cout << "]";
}

void fast_io(){
    ios_base::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
}
void io(string taskname){
    string fin = taskname + ".in";
    string fout = taskname + ".out";
    const char* FIN = fin.c_str();
    const char* FOUT = fout.c_str();
    freopen(FIN, "r", stdin);
    freopen(FOUT, "w", stdout);
    fast_io();
}
vector<ll> a;
int main(){
    fast_io();
    int n;
    ll m;

    vector<ll> f;
    vector<ll> s;
    cin >> n >> m;
    int x = n/2;
    int y = n-x;
    f0r(i, n){
        ll ai;
        cin >> ai;
        if(i<x){
            f.eb(ai);
        }
        else s.eb(ai);
    }
    vector<ll> a;
    vector<ll> b;
    f0r(i, (1<<x)){
        ll tmp = 0;
        f0r(j, x){
            if(((1<<j)& i)>0){
                tmp += f[j];
            }
        }
        a.eb(tmp);

    }
    f0r(i, (1<<y)){
        ll tmp = 0;
        f0r(j, y){
            if(((1<<j)& i)>0){
                tmp += s[j];
            }
        }
        b.eb(tmp);
    }
    sort(all(a));
    sort(all(b));
    //cout << a << endl;
    //cout << b << endl;
    ll ptr = 0;
    ll ans = 0;
    for(int i = sz(a)-1; i>= 0; i--){
        while(ptr +1<sz(b) && b[ptr+1] + a[i]<=m){
            ptr++;
        }
        //cout << i << " " << ptr << endl;
        if(b[ptr] + a[i] <= m)
            ans += (ptr + 1);
    }
    cout << ans << endl;
    return 0;
}

Compilation message (stderr)

bobek.cpp:1:0: warning: ignoring #pragma comment  [-Wunknown-pragmas]
 #pragma comment(linker, "/stack:200000000")
 
bobek.cpp: In function 'void io(std::__cxx11::string)':
bobek.cpp:50:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FIN, "r", stdin);
     ~~~~~~~^~~~~~~~~~~~~~~~~
bobek.cpp:51:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
     freopen(FOUT, "w", stdout);
     ~~~~~~~^~~~~~~~~~~~~~~~~~~

• 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