Submission #137662

#	Time	Username	Problem	Language	Result	Execution time	Memory
137662		hamzqq9	Lightning Rod (NOI18_lightningrod)	C++14	0 / 100	2063 ms	79556 KiB

Main

#include<bits/stdc++.h>
#define st first
#define nd second
#define pb push_back
#define ppb pop_back
#define ii pair<int,int>
#define ll long long
#define umin(x,y) x=min(x,y)
#define umax(x,y) x=max(x,y)
#define orta ((bas+son)>>1)
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define inf 2000000000
#define N 500005
#define MOD 1000000007
using namespace std;

int main() {

	int n;

	scanf("%d",&n);

	vector<ii> a(n);
	vector<bool> u(n);
	int cnt=n;

	for(int i=0;i<n;i++) {

		scanf("%d %d",&a[i].st,&a[i].nd);

	}

	return 0;

	sort(a.begin(),a.end());

	int mn=inf;

	for(int i=n-1;i>=0;i--) {

		int val=a[i].st-a[i].nd;

		if(mn<=val) {

			cnt-=!u[i];
			u[i]=1;

		}

		umin(mn,val);

	}

	for(int i=0;i<n;i++) {

		int b=i;

		while(i+1<n && a[i].st==a[i+1].st) i++;

		reverse(a.begin()+b,a.begin()+i+1);

	}

	int mx=-inf;

	for(int i=0;i<n;i++) {

		int val=a[i].st+a[i].nd;

		if(mx>=val) {

			cnt-=!u[i];
			u[i]=1;

		}

		umax(mx,val);

	}

	printf("%d",cnt);

}

Compilation message (stderr)

lightningrod.cpp: In function 'int main()':
lightningrod.cpp:22:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d",&n);
  ~~~~~^~~~~~~~~
lightningrod.cpp:30:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d",&a[i].st,&a[i].nd);
   ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~

• 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