Submission #403977

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
403977	2021-05-13 16:09:17	rama_pang	Love Polygon (BOI18_polygon)	C++17	100 / 100	319 ms	36376 KiB

polygon

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#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  int N;
  cin >> N;
  vector<int> to(N);
  const auto GetName = [&](string s) {
    static map<string, int> mp;
    if (mp.count(s)) return mp[s];
    return mp[s] = mp.size();
  };
  for (int i = 0; i < N; i++) {
    string s, t;
    cin >> s >> t;
    int u = GetName(s);
    int v = GetName(t);
    to[u] = v;
  }
  if (N & 1) {
    cout << -1 << '\n';
    return 0;
  }
 
 
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• Subtask 1: 21 / 21
• Subtask 2: 25 / 25
• Subtask 3: 29 / 29
• Subtask 4: 25 / 25