제출 #655922

#제출 시각아이디문제언어결과실행 시간메모리
655922FarbodNetwork (BOI15_net)C++17
100 / 100
438 ms47516 KiB
/* * In the name of God * * Author: Farbod Doost * Last Modified: Sun, 06 Nov 2022 (09:07:00) * */ #include <iostream> #include <vector> using namespace std; const int N = 5e5 + 1; int n; vector <int> adj[N], vec; void dfs(int v, int p) { for (auto u: adj[v]) if (u != p) dfs(u, v); if (adj[v].size() == 1) vec.push_back(v); return; } signed main() { ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0); cin >> n; for (int i = 0; i < n - 1; i++) { int u, v; cin >> u >> v, u--, v--; adj[u].push_back(v), adj[v].push_back(u); } int idx = -1; for (int i = 0; i < n; i++) if (adj[i].size() > 1) { dfs(i, i), idx = i; break; } int tmp = ((int)vec.size() + 1) / 2; cout << tmp << '\n'; for (int i = 0; i < tmp - (vec.size() % 2); i++) cout << vec[i] + 1 << ' ' << vec[i + tmp] + 1 << '\n'; if ((int)vec.size() % 2 == 1) cout << vec[tmp - 1] + 1 << ' ' << idx + 1 << '\n'; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

net.cpp: In function 'int main()':
net.cpp:52:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |  for (int i = 0; i < tmp - (vec.size() % 2); i++)
      |                  ~~^~~~~~~~~~~~~~~~~~~~~~~~
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