#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define ull unsigned long long
#define pb(e) push_back(e)
#define sv(a) sort(a.begin(),a.end())
#define sa(a,n) sort(a,a+n)
#define mp(a,b) make_pair(a,b)
#define vf first
#define vs second
#define ar array
#define all(x) x.begin(),x.end()
const int inf = 0x3f3f3f3f;
const int mod = 1000000007;
const double PI=3.14159265358979323846264338327950288419716939937510582097494459230;
mt19937_64 RNG(chrono::steady_clock::now().time_since_epoch().count());
bool remender(ll a , ll b){return a%b;}
bool can(int x , int e , int x1 , int e1){
return (abs(x-x1) <= e1-e);
}
void solve(){
int n;
cin >> n;
int arr[n] , a[n];
for(int i = 0; i < n; i++)cin >> arr[i] >> a[i];
int cnt[n];
for(int i = 0; i < n; i++)cnt[i] = 2;
stack<int> s;
for(int i = 0; i < n; i++){
while(s.size() && can(arr[s.top()],a[s.top()],arr[i],a[i])){
cnt[s.top()]--;
s.pop();
}
s.push(i);
}
while(s.size())s.pop();
for(int i = n - 1; i >= 0; i--){
while(s.size() && can(arr[s.top()],a[s.top()],arr[i],a[i])){
cnt[s.top()]--;
s.pop();
}
s.push(i);
}
int ans = 0;
for(int i = 0; i < n; i++){
if(cnt[i] == 2)ans++;
}
cout << ans << '\n';
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(0);
//freopen("deleg.in", "r", stdin);
//freopen("deleg.out", "w", stdout);
//int t;cin >> t;while(t--)
solve();
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
1 ms |
328 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Incorrect |
1 ms |
324 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
212 KB |
Output is correct |
2 |
Incorrect |
1 ms |
324 KB |
Output isn't correct |
3 |
Halted |
0 ms |
0 KB |
- |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
1 ms |
328 KB |
Output isn't correct |
2 |
Halted |
0 ms |
0 KB |
- |