Submission #572831

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
572831	2022-06-05 11:05:50	Devigo	Lightning Rod (NOI18_lightningrod)	C++14	0 / 100	2103 ms	213956 KiB

Main

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#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define mp make_pair
const int siz = 0;
const int mod = 0;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int n;
  cin >> n;
  vector<pair<int,int>> v(n);
  for(int i=0; i<n; i++) {
    cin >> v[i].first >> v[i].second;
  }
  int cnt = 0;
  map<int,int> m;
  for(int i=0; i<n; i++) {
    m[v[i].first]++;
    if(m[v[i].first] == 1) cnt++;
  }
  cout << cnt << "\n";
  return 0;
}
 
 
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