Submission #1258105

#TimeUsernameProblemLanguageResultExecution timeMemory
1258105pandaa73World Map (IOI25_worldmap)C++20
0 / 100
20 ms2888 KiB
#include <bits/stdc++.h> using namespace std; #define lf "\n" #define ff endl #define _ << ' ' << #define all(x) begin(x),end(x) #define rall(x) rbegin(x),rend(x) #define infos(str) do { fprintf(stderr, str"\n"); } while(0) #define infor(str, ...) do { fprintf(stderr, str, __VA_ARGS__); } while(0) #define infof(str, ...) do { fprintf(stderr, str"\n", __VA_ARGS__); } while(0) #ifndef DEBUG #undef infos #undef infor #undef infof #define infos(str) #define infor(str, ...) #define infof(str, ...) #endif using ll = long long; constexpr int LOG = 20; constexpr int MOD = 1e9+7; constexpr int MAXN = 1e5+7; std::vector<std::vector<int>> create_map(int N, int M, std::vector<int> A, std::vector<int> B) { if(N == 1) return {{1}}; vector<set<int>> adj(N + 1); for(int i = 0; i < M; ++i) { adj[A[i]].insert(B[i]); adj[B[i]].insert(A[i]); } vector<bool> vis(N + 1); vector<int> tour; auto dfs = [&](int v, auto &&dfs) -> void { tour.push_back(v); vis[v] = 1; for(auto u: adj[v]) { if(vis[u]) continue; dfs(u, dfs); tour.push_back(v); } }; dfs(1, dfs); tour.resize(2 * N, 1); fill(all(vis), 0); vector<vector<int>> ans(3 * N, vector<int>(3 * N)); int sz = 0; int trgt = N; int r = 0, k = 0; for(int i = 0; i < 2 * N; ++i) { infof("%d: r = %d | sz = %d", i, r, sz); if(k >= trgt && r >= sz) break; int v = tour[i]; if(k > 0) { for(int c = k&1; c < 3 * N; c += 2) ans[r][c] = v; r++; } fill(all(ans[r]), v); if(vis[v]) continue; vis[v] = 1; int c = k&1; for(auto u: adj[v]) { ans[r][c] = u; adj[u].erase(v); if(adj[u].empty()) { trgt--; vis[u] = 1; } c += 2; } r++; sz = max(sz, c - 1); k++; fill(all(ans[r]), v); } sz = max(sz, r); ans.resize(sz); for(auto &v: ans) v.resize(sz); return ans; }
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