제출 #473524

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
473524		_L__	San (COCI17_san)	C++17	0 / 120	1094 ms	14572 KiB

san

// This code is written by _L__
#include <bits/stdc++.h>
using namespace std;
#define endl '\n'
#define F_word ios_base::sync_with_stdio(false), cin.tie(NULL), cout.tie(NULL);
typedef long long ll;
typedef long double ld;
const ll mod = 1e9+7, N = 5e5+13, inf = 1e9+1;
const ld E = 1e-6;
#define ff first
#define ss second

int main(void){
    F_word;
    ll n, k; cin >> n >> k;
    ll h[n] = {}, c[n]= {};
    ll ans = 0;
    int x = n/2; int b = (n-(n/2));
    for(int i = 0; i < n; ++i) cin >> h[i] >> c[i];
    vector<pair<ll, ll>> fbi;
    for(int i = 0; i < (1<<x); ++i){
        ll hg = 0, gg = 0;
        for(int j = 0; j < x; ++j){
            if(i&(1<<j)){
                if(hg <= h[j]){hg = h[j], gg += c[j];}
                else break;
            }
        }
        fbi.push_back({hg, gg});
        ans += (gg >= k);
    }
    //for(auto u: fbi) cout << u.ff << ' ' << u.ss << endl;
    map<ll, vector<ll>> mp;
    for(int i = 0; i < (1<<b); ++i){
        ll hg = 0, gg = 0;
        for(int j = 0; j < b; ++j){
            if(i&(1<<j)){
                if(hg <= h[j+x]){hg = h[j+x]; gg += c[j+x];}
                else {gg = -1; break;}
            }
        }
        if(gg == -1) continue;
        for(int j = 0; j < b; ++j){
            if(i&(1<<j)){
                mp[h[j+x]].push_back(gg);
                break;
            }
        }
    }
    for(auto i: mp)sort(i.ss.begin(), i.ss.end());
    for(auto u: fbi){
        for(auto i: mp){
            if(i.ff >= u.ff){
                ll f = lower_bound(i.ss.begin(), i.ss.end(), k-u.ss)-i.ss.begin();
                ans += i.ss.size()-f;
            }
        }
    }
    cout << ans << endl;
} 

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