Submission #243759

#	Time	Username	Problem	Language	Result	Execution time	Memory
243759		AmineWeslati	Lightning Rod (NOI18_lightningrod)	C++14	66 / 100	1902 ms	262148 KiB

Main

//Never stop trying
#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;

template <typename T>
using ordered_set=tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
//s.order_of_key(), *s.find_by_order()

using namespace std;
#define boost ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

typedef string str;
typedef long long ll;
#define int ll
typedef double db;
typedef long double ld;

typedef pair<int,int> pi;
#define fi first
#define se second

typedef vector<int> vi;
typedef vector<ld> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;

#define pb push_back
#define eb emplace_back
#define pf push_front

#define lb lower_bound
#define ub upper_bound

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define endl "\n"

const int MOD = 1e9+7; //998244353
const ll INF = 1e18;
const int nx[4]={0,0,1,-1}, ny[4]={1,-1,0,0}; //right left down up

int32_t main(){
   boost;
   int N; cin>>N;
   int mx[N],mx2[N];
   int x[N],y[N];
   for(int i=0; i<N; i++)
      cin>>x[i]>>y[i];

   for(int i=0; i<N; i++){
      if(!i) mx[i]=x[i]+y[i];
      else mx[i]=max(mx[i-1],x[i]+y[i]);
   }
   for(int i=N-1; i>=0; i--){
      if(i==N-1) mx2[i]=y[i]-x[i];
      else mx2[i]=max(mx2[i+1],y[i]-x[i]);
   }
   int res=0;
   for(int i=0; i<N; i++){
      if((!i && mx2[i]>mx2[i+1])||(i==N-1 && mx[i]>mx[i-1])||(mx[i]>mx[i-1] && mx2[i]>mx2[i+1])) res++;
   }
   cout << res << endl;

   return 0;
}

• 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