Submission #465586

#TimeUsernameProblemLanguageResultExecution timeMemory
465586prvocisloWerewolf (IOI18_werewolf)C++17
100 / 100
905 ms126236 KiB
#include "werewolf.h" #include <vector> #include <set> using namespace std; const int maxn = 2e5 + 5; int pa[maxn], siz[maxn], query_size[maxn], tin[maxn], query_l[maxn], query_r[maxn], time = 0; vector<int> g[maxn], dsu_g[maxn], e1[maxn], e2[maxn]; set<int> node[maxn]; int root(int u) { return u == pa[u] ? u : root(pa[u]); } void merge(int u, int v, bool type) { u = root(u), v = root(v); if (u == v) return; if (siz[u] < siz[v]) swap(u, v); pa[v] = u, siz[u] += siz[v]; if (!type) dsu_g[u].push_back(v); else for (int i : node[v]) node[u].insert(i); } void dfs(int u) { tin[u] = time++; for (int v : dsu_g[u]) dfs(v); } vector<int> check_validity(int n, vector<int> x, vector<int> y, vector<int> s, vector<int> e, vector<int> l, vector<int> r) { for (int i = 0; i < x.size(); i++) g[x[i]].push_back(y[i]), g[y[i]].push_back(x[i]); int q = s.size(); vector<int> ans(q, 0); for (int i = 0; i < q; i++) e1[l[i]].push_back(i), e2[r[i]].push_back(i); for (int i = 0; i < n; i++) pa[i] = i, siz[i] = 1; for (int i = n - 1; i >= 0; i--) { for (int j : g[i]) if (j > i) merge(i, j, false); for (int j : e1[i]) { query_l[j] = root(s[j]); query_size[j] = siz[query_l[j]]; } } for (int i = 0; i < n; i++) if (pa[i] == i) dfs(i); for (int i = 0; i < q; i++) query_l[i] = tin[query_l[i]], query_r[i] = query_l[i] + query_size[i] - 1; for (int i = 0; i < n; i++) pa[i] = i, siz[i] = 1, node[i].insert(tin[i]); for (int i = 0; i < n; i++) { for (int j : g[i]) if (j < i) merge(i, j, true); for (int j : e2[i]) { int u = root(e[j]); auto it = node[u].lower_bound(query_l[j]); if (it != node[u].end() && *it <= query_r[j]) ans[j] = true; } } return ans; }

Compilation message (stderr)

werewolf.cpp: In function 'std::vector<int> check_validity(int, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
werewolf.cpp:27:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   27 |  for (int i = 0; i < x.size(); i++) g[x[i]].push_back(y[i]), g[y[i]].push_back(x[i]);
      |                  ~~^~~~~~~~~~
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