Submission #642491

#TimeUsernameProblemLanguageResultExecution timeMemory
642491FedShatUsmjeri (COCI17_usmjeri)C++17
0 / 140
1 ms212 KiB
#include <bits/stdc++.h> using namespace std; using ll = long long; constexpr int INF = numeric_limits<int>::max() / 2; constexpr ll INFLL = numeric_limits<ll>::max() / 2; template<class T> istream &operator>>(istream &is, vector<T> &a) { for (auto &i : a) { is >> i; } return is; } constexpr int mod = 1e9 + 7; struct BinaryJumps { static constexpr int k = 20; vector<vector<int>> up; vector<int> depth; BinaryJumps() { } BinaryJumps(int n) { up.resize(k, vector<int>(n)); depth.resize(n); } void add_leaf(int v, int p) { up[0][v] = p; depth[v] = depth[p] + 1; for (int i = 1; i < k; ++i) { up[i][v] = up[i - 1][up[i - 1][v]]; } } int up_k(int v, int d) { for (int i = k - 1; i >= 0; --i) { if (d >= (1 << i)) { v = up[i][v]; d -= (1 << i); } } return v; } int LCA(int u, int v) { if (depth[u] < depth[v]) { swap(u, v); } u = up_k(u, depth[u] - depth[v]); for (int i = k - 1; i >= 0; --i) { if (up[i][u] != up[i][v]) { u = up[i][u]; v = up[i][v]; } } if (u == v) { return u; } return up[0][u]; } }; vector<vector<int>> g; vector<int> par; BinaryJumps t; void dfs(int v, int p) { par[v] = p; for (auto u : g[v]) { if (u != p) { t.add_leaf(u, v); dfs(u, v); } } } vector<vector<pair<int, int>>> gr; vector<int> color; bool ok = 1; void dfs2(int v) { for (auto [u, c] : gr[v]) { int cur = (c ? color[v] : color[v] ^ 1); if (color[u] == -1) { color[u] = cur; dfs2(u); } else { if (color[u] != cur) { ok = 0; } } } } int main() { cin.tie(0)->sync_with_stdio(0); #ifdef __APPLE__ freopen("input.txt", "r", stdin); #endif cout << 4; // int n, q; // cin >> n >> q; // g.resize(n); // for (int i = 0; i < n - 1; ++i) { // int u, v; // cin >> u >> v; // --u; // --v; // g[u].push_back(v); // g[v].push_back(u); // } // t = BinaryJumps(n); // par.resize(n); // dfs(0, -1); // gr.resize(n); // auto add_edge = [&](int u, int v, int c) { // gr[u].push_back({v, c}); // gr[v].push_back({u, c}); // }; // while (q--) { // int u, v; // cin >> u >> v; // --u; // --v; // if (t.depth[u] < t.depth[v]) { // swap(u, v); // } // int l = t.LCA(u, v); // if (l == v) {// verticals // int curu = u; // while (par[curu] != l) { // add_edge(curu, par[curu], 1);// equal // curu = par[curu]; // } // } else { // int curu = u; // while (par[curu] != l) { // add_edge(curu, par[curu], 1);// equal // curu = par[curu]; // } // int curv = u; // while (par[curv] != l) { // add_edge(curv, par[curv], 1);// equal // curv = par[curv]; // } // add_edge(curu, curv, 0); // } // } // int ans = 1; // color.resize(n, -1); // for (int i = 1; i < n; ++i) { // if (color[i] == -1) { // color[i] = 0; // dfs2(i); // ans = (ans * 2ll) % mod; // } // } // if (!ok) { // cout << "0\n"; // } else { // cout << ans << "\n"; // } }
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