oj.uz

Submission #1025850

# Submission time Handle Problem Language Result Execution time Memory
1025850 2024-07-17T10:46:40 Z vjudge1 San (COCI17_san) C++17
72 / 120
 1000 ms 14780 KB 
#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

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
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 1 ms 344 KB Output is correct

Subtask #2
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 60 ms 348 KB Output is correct
2 Correct 63 ms 348 KB Output is correct

Subtask #3
24.0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 905 ms 14780 KB Output is correct
2 Correct 75 ms 596 KB Output is correct

Subtask #4
0 / 24.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1082 ms 2056 KB Time limit exceeded
2 Halted 0 ms 0 KB -

Subtask #5
0 / 24.0

# Verdict Execution time Memory Grader output
1 Execution timed out 1054 ms 7684 KB Time limit exceeded
2 Halted 0 ms 0 KB -