Submission #639416

#	Time	Username	Problem	Language	Result	Execution time	Memory
639416		inksamurai	San (COCI17_san)	C++17	120 / 120	252 ms	2296 KiB

san

#include <bits/stdc++.h>
#define int ll
using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define per(i,n) for(int i=n-1;i>=0;i--)
#define rng(i,c,n) for(int i=c;i<n;i++)
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)a.size()
#define vec(...) vector<__VA_ARGS__>
#define _3xaMC2q ios::sync_with_stdio(0),cin.tie(0)
typedef long long ll;
using pii=pair<int,int>;
using vi=vector<int>;
void print(){cout<<'\n';}
template<class h,class...t>
void print(const h&v,const t&...u){cout<<v<<' ',print(u...);}
//e

signed main(){
_3xaMC2q;
	int n,k;
	cin>>n>>k;
	vec(pii) a(n);
	rep(i,n){
		cin>>a[i].fi>>a[i].se;
	}
	int res=0;
	vec(vi) rbts(n);
	int si=(n+1)/2;
	rep(msk,(1<<(n-si))){
		int sun=0,_lst=-1,_fst=-1;
		bool pok=1;
		rng(i,si,n){
			if(msk>>(i-si)&1){
				if(a[i].fi<_lst){
					pok=0;
					break;
				}
				sun+=a[i].se;
				_lst=a[i].fi;
				if(_fst==-1)_fst=i;
			}
		}
		if(!pok or _fst==-1) continue;
		if(sun>=k){
			res+=1;
		}
		rbts[_fst].pb(sun);
	}
	rep(i,n){
		sort(rbts[i].begin(),rbts[i].end());
	}
	rep(msk,(1<<si)){
		int sun=0,_lst=-1;
		bool pok=1;
		rep(i,si){
			if(msk>>i&1){
				if(a[i].fi<_lst){
					pok=0;
					break;
				}
				sun+=a[i].se;
				_lst=a[i].fi;
			}
		}
		if(!pok or _lst==-1) continue;
		if(sun>=k){
			res+=1;
		}
		rng(i,si,n){
			if(_lst<=a[i].fi){
				int j=(int)(lower_bound(rbts[i].begin(),rbts[i].end(),k-sun)-rbts[i].begin());
				// print(msk,_lst);
				res+=sz(rbts[i])-j;
			}
		}
	}
	print(res);
}

• Subtask 1: 24 / 24
• Subtask 2: 24 / 24
• Subtask 3: 24 / 24
• Subtask 4: 24 / 24
• Subtask 5: 24 / 24