Submission #273072

#	Time	Username	Problem	Language	Result	Execution time	Memory
273072		T0p_	Global Warming (NOI13_gw)	C++14	6 / 40	1081 ms	17012 KiB

gw

#include<bits/stdc++.h>
using namespace std;

int n;
long long h[1001000];
vector<long long> v;

int solve(long long x)
{
	bool ch = x < h[1];
	int ret = 0;
	for(int i=2 ; i<=n ; i++)
	{
		if(x < h[i]) ch = true;
		else
		{
			if(ch)
			{
				ch = false;
				ret++;
			}
		}
	}
	if(ch) ret++;
	return ret;
}

int main()
{
	scanf(" %d",&n);
	for(int i=1 ; i<=n ; i++)
	{
		scanf(" %lld",&h[i]);
		v.push_back(h[i]);
	}
	sort(v.begin(), v.end());
	int l = 0, r = n-1;
	while(l != r)
	{
		int mid = (l+r+1)>>1;
		int ll = 0, rr = mid;
		while(ll != rr)
		{
			int mm = (ll+rr+1)>>1;
			(solve(v[mm]) != solve(v[mid])) ? ll = mm : rr = mm-1;
		}
		(solve(v[ll]) <= solve(v[mid])) ? l = mid : r = mid-1;
	}
	printf("%d\n",solve(v[l]));
	return 0;
}

Compilation message (stderr)

gw.cpp: In function 'int main()':
gw.cpp:30:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   30 |  scanf(" %d",&n);
      |  ~~~~~^~~~~~~~~~
gw.cpp:33:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   33 |   scanf(" %lld",&h[i]);
      |   ~~~~~^~~~~~~~~~~~~~~

• Subtask 1: 0 / 6
• Subtask 2: 6 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 10
• Subtask 5: 0 / 11