Submission #142881

#	Time	Username	Problem	Language	Result	Execution time	Memory
142881		Ort	San (COCI17_san)	C++11	48 / 120	1078 ms	380 KiB

san

#include<bits/stdc++.h>
#define ALL(c) (c).begin(),(c).end()
#define ll long long
#define pb push_back
#define sz(a) ((int)(a.size()))
#define IO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define MAX 200005
#define N 21

using namespace std;

typedef pair<ll,ll> pll;

int n, fh, sh;
ll k, hi, gi, sol, curr, sum, lstc;
ll h[N], g[N];
vector<ll> t[N];

bool flag;

int main() {
	IO;
	cin >> n >> k;
	fh = n>>1;
	sh = n-fh;
	for(int i=0;i<n;i++) cin >> h[i] >> g[i];
	for(int i=1;i<(1<<fh);i++) {
		curr = 0; sum = 0; flag = 0; lstc = -1;
		for(int j=0;j<fh;j++)
			if((i>>j)&1) {
				if(h[j]>=curr) curr = h[j], sum += g[j], lstc = j;
				else {flag = 1; break;}
			}
		if(sum>=k && !flag) sol++;
		if(flag) continue;
		t[lstc].pb(sum);
	}
	for(int i=0;i<fh;i++) sort(ALL(t[i]));
	for(int i=1;i<(1<<sh);i++) {
		curr = 0; sum = 0; flag = 0; lstc = -1;
		for(int j=0;j<sh;j++)
			if((i>>j)&1) {
				if(lstc==-1) lstc = h[j+fh];
				if(h[j+fh]>=curr) curr = h[j+fh], sum += g[j+fh];
				else {flag = 1; break;}
			}
		if(sum>=k && !flag) sol++;
		if(flag) continue;
		for(int j=0;j<fh;j++) {
			if(h[j]<=lstc) sol += (t[j].end() - lower_bound(ALL(t[j]),max(0ll,k-sum)));
		}
	}
	cout << sol;
	return 0;
}

• Subtask 1: 24 / 24
• Subtask 2: 24 / 24
• Subtask 3: 0 / 24
• Subtask 4: 0 / 24
• Subtask 5: 0 / 24