Submission #599886

#	Time	Username	Problem	Language	Result	Execution time	Memory
599886		starchan	Lightning Rod (NOI18_lightningrod)	C++17	0 / 100	2071 ms	157016 KiB

Main

#include<bits/stdc++.h>
using namespace std;
#define int long long
#define in pair<int, int>
#define f first
#define s second
#define pb push_back
#define pob pop_back
#define INF (int)1e17
#define MX (int)3e5+5
#define fast() ios_base::sync_with_stdio(false); cin.tie(NULL)
inline int readInt()
{
	int x = 0; char ch=getchar_unlocked(); bool st = 1;
	while(ch < '0'  || ch > '9'){if(ch=='-')st=0; ch=getchar_unlocked();}
	while(ch>='0'&&ch<='9'){x = (x<<3)+(x<<1)+ch-'0';ch=getchar_unlocked();}
	return st?x:-x;
}
vector<int> add(1e7+1, 0);
vector<int> sub(1e7+1, 0);
signed main()
{
	fast();
	int n = readInt();
	for(int i = 1; i <= n; i++)
	{
		int x, y;
		x = readInt();
		y = readInt();
		add[i] = x+y;
		sub[i] = y-x;
		if(i > 1)
			add[i] = max(add[i], add[i-1]);
	}
	for(int i = n-1; i >= 1; i--)
		sub[i] = max(sub[i], sub[i+1]);
	int ans = 0;
	for(int i = n; i >= n; i++)
	{
		ans+=(((i==1)||(add[i] > add[i-1]))&&((i==n)||(sub[i] > sub[i+1])));
		if(i < n)
			sub[i] = max(sub[i], sub[i+1]);
	}
	cout << ans;
	return 0;
}	

• Subtask 1: 0 / 4
• Subtask 2: 0 / 7
• Subtask 3: 0 / 12
• Subtask 4: 0 / 21
• Subtask 5: 0 / 26
• Subtask 6: 0 / 10
• Subtask 7: 0 / 20