Submission #1025850

#	Time	Username	Problem	Language	Result	Execution time	Memory
1025850		vjudge1	San (COCI17_san)	C++17	72 / 120	1082 ms	14780 KiB

san

#include <bits/stdc++.h>

using namespace std;

#define int long long

signed main()
{
	int n,k;
	cin>>n>>k;
	int h[n],a[n];
	for (int i=0;i<n;i++)
		cin>>h[i]>>a[i];
	int ans=0;
	if (n<=20)
	{
		for (int i=0;i<(1<<n);i++)
		{
			bool b=1;
			int x=0,pre=0;
			for (int p=0;p<n;p++)
				if ((1<<p)&i)
				{
					if (h[p]<pre)
						b=0;
					pre=h[p];
					x+=a[p];
				}
			if (x>=k && b)
				ans++;
		}
	}
	else
	{
		map<int,vector<int>> mp;
		for (int i=0;i<(1<<20);i++)
		{
			bool b=1;
			int x=0,pre=0;
			for (int p=0;p<20;p++)
				if ((1<<p)&i)
				{
					if (h[p]<pre)
						b=0;
					pre=h[p];
					x+=a[p];
				}
			if (b)
				mp[pre].push_back(x),ans+=(x>=k);
		}
		for (auto &i:mp)
			sort(i.second.begin(),i.second.end());
		for (int i=0;i<(1<<n-20);i++)
		{
			bool b=1;
			int x=0,pre=0,fir=0;
			for (int p=0;p<n-20;p++)
				if ((1<<p)&i)
				{
					if (h[p+20]<pre)
						b=0;
					x+=a[p+20];
					pre=h[p+20];
					if (!fir)
						fir=h[p+20];
				}
			if (!b)
				continue;
			for (auto i:mp)
				if (i.first<=fir)
				{
					int y=lower_bound(i.second.begin(),i.second.end(),k-x)-i.second.begin();
					ans+=i.second.size()-y;
				}
				else
					break;
		}
	}
	cout<<ans<<endl;
	
	return 0;
}

Compilation message (stderr)

san.cpp: In function 'int main()':
san.cpp:53:23: warning: suggest parentheses around '-' inside '<<' [-Wparentheses]
   53 |   for (int i=0;i<(1<<n-20);i++)
      |                      ~^~~

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