Submission #265318

#	Time	Username	Problem	Language	Result	Execution time	Memory
265318		T0p_	Lightning Rod (NOI18_lightningrod)	C++14	0 / 100	2077 ms	61596 KiB

Main

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

pair<int, int> arr[10000005];

int main()
{
	int n, now = 0;
	scanf(" %d",&n);
	while(n--)
	{
		int x, y;
		scanf(" %d %d",&x,&y);
		if(now == 0) arr[++now] = {x, y};
		else
		{
			int h = arr[now].second - x + arr[now].first;
			if(h >= y) continue ;
			int l = 1, r = now;
			while(l != r)
			{
				int mid = (l+r+1)>>1;
				int h = y - x + arr[mid].first;
				if(h >= arr[mid].second) r = mid-1;
				else l = mid;
			}
			now = l;
			arr[++now] = {x, y};
		}
	}
	printf("%d\n",now);
	return 0;
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:9:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    9 |  scanf(" %d",&n);
      |  ~~~~~^~~~~~~~~~
lightningrod.cpp:13:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   13 |   scanf(" %d %d",&x,&y);
      |   ~~~~~^~~~~~~~~~~~~~~~

• 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