Submission #200043

#	Time	Username	Problem	Language	Result	Execution time	Memory
200043		wilwxk	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	2071 ms	131800 KiB

Main

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

vector<pair<int, int> > st;
int n;

int main() {
	scanf("%d", &n);
	for(int i = 1; i <= n; i++) {
		int a, b; scanf("%d %d", &a, &b);
		if(st.size() && a-st.back().first <= abs(b-st.back().second) && st.back().second >= b) continue; 
		while(st.size() && a-st.back().first <= abs(b-st.back().second)) st.pop_back();
		st.push_back({a, b});
	}
	printf("%d\n", int(st.size()));
}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:8:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
lightningrod.cpp:10:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int a, b; scanf("%d %d", &a, &b);
             ~~~~~^~~~~~~~~~~~~~~~~

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