Submission #200040

#	Time	Username	Problem	Language	Result	Execution time	Memory
200040		wilwxk	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	2037 ms	131000 KiB

Main

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

const int MAXN = 1e7+7;
pair<int, int> v[MAXN];
int n;

int main() {
	scanf("%d", &n);
	for(int i = 1; i <= n; i++) {
		int a, b; scanf("%d %d", &a, &b);
		v[i].first = a+b;
		v[i].second = b-a;
	}
	sort(v+1, v+1+n);

	int ans = 0; int mx = -(2e9+7);
	for(int i = n; i >= 1; i--) if(v[i].second > mx) mx = v[i].second, ans++;

	printf("%d\n", ans);
}

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]
  scanf("%d", &n);
  ~~~~~^~~~~~~~~~
lightningrod.cpp:11:18: 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