제출 #1261755

#제출 시각아이디문제언어결과실행 시간메모리
1261755NafeeszxPictionary (COCI18_pictionary)C++20
140 / 140
55 ms20760 KiB
#pragma GCC optimize("O3") #pragma GCC optimize("unroll-loops") #include <bits/stdc++.h> using namespace std; #define trav(a, x) for(auto& a : x) #define FOR(i, a, b) for (int i=(a); i<=(signed)(b); i++) #define ROF(i, a, b) for (int i=(a); i>=(signed)(b); i--) #define F0R(i, a) for (int i=0; i<(signed)(a); i++) #define vi vector<int> #define f first #define s second #define all(v) (v).begin(), (v).end() typedef long long ll; const ll mod = 998244353, inf = mod*mod; template <class S, S (*op)(S, S), S (*e)()> struct segtree { public: int ceil_pow2(int n) { int x = 0; while ((1U << x) < (unsigned int)(n)) x++; return x; } segtree() : segtree(0) {} segtree(int n) : segtree(std::vector<S>(n, e())) {} segtree(const std::vector<S>& v) : _n(int(v.size())) { log = ceil_pow2(_n); size = 1 << log; d = std::vector<S>(2 * size, e()); for (int i = 0; i < _n; i++) d[size + i] = v[i]; for (int i = size - 1; i >= 1; i--) { update(i); } } void set(int p, S x) { assert(0 <= p && p < _n); p += size; d[p] = x; for (int i = 1; i <= log; i++) update(p >> i); } S get(int p) { assert(0 <= p && p < _n); return d[p + size]; } S prod(int l, int r) { assert(0 <= l && l <= r && r <= _n); S sml = e(), smr = e(); l += size; r += size; while (l < r) { if (l & 1) sml = op(sml, d[l++]); if (r & 1) smr = op(d[--r], smr); l >>= 1; r >>= 1; } return op(sml, smr); } S all_prod() { return d[1]; } template <bool (*f)(S)> int max_right(int l) { return max_right(l, [](S x) { return f(x); }); } template <class F> int max_right(int l, F f) { assert(0 <= l && l <= _n); assert(f(e())); if (l == _n) return _n; l += size; S sm = e(); do { while (l % 2 == 0) l >>= 1; if (!f(op(sm, d[l]))) { while (l < size) { l = (2 * l); if (f(op(sm, d[l]))) { sm = op(sm, d[l]); l++; } } return l - size; } sm = op(sm, d[l]); l++; } while ((l & -l) != l); return _n; } template <bool (*f)(S)> int min_left(int r) { return min_left(r, [](S x) { return f(x); }); } template <class F> int min_left(int r, F f) { assert(0 <= r && r <= _n); assert(f(e())); if (r == 0) return 0; r += size; S sm = e(); do { r--; while (r > 1 && (r % 2)) r >>= 1; if (!f(op(d[r], sm))) { while (r < size) { r = (2 * r + 1); if (f(op(d[r], sm))) { sm = op(d[r], sm); r--; } } return r + 1 - size; } sm = op(d[r], sm); } while ((r & -r) != r); return 0; } private: int _n, size, log; std::vector<S> d; void update(int k) { d[k] = op(d[2 * k], d[2 * k + 1]); } }; using S = int; S op (S a, S b) { return min(a, b); } S e() { return mod; } int main() { ios_base::sync_with_stdio(0); cin.tie(0); int n, m, q; cin >> n >> m >> q; vector<vector<int>> adj(2*n); vector<int> par(2*n); int id = n; auto find = [&] (auto find, int u) -> int { return par[u] == u ? u : par[u] = find(find, par[u]); }; F0R(i, n) { par[i] = i; } vector<int> id_e(2*n-1); ROF(i, m, 1) { auto unite = [&] (int u, int v) -> void { u = find(find, u), v = find(find, v); if (u == v) return; par[u] = par[v] = par[id] = id; adj[id] = {u, v}; id_e[id] = m-i+1; id++; }; vector<int> mults; for(int j = i; j <= n; j += i) { mults.push_back(j-1); } F0R(i, mults.size()-1) { unite(mults[i], mults[i+1]); } } // F0R(_, 2*n-1) { // cout << _ << ": "; // trav(x, adj[_]) cout << x << " "; // cout << "\n"; // } // FOR(i, n, 2*n-2) cout << id_e[i] << " "; // cout << "\n"; vector<int> tin(2*n-1), et1, i_tin(8*n); auto dfs1 = [&] (auto dfs1, int u) -> void { tin[u] = et1.size(); i_tin[et1.size()] = u; et1.push_back(tin[u]); trav(v, adj[u]) { dfs1(dfs1, v); et1.push_back(tin[u]); } }; dfs1(dfs1, 2*n-2); segtree<S, op, e>ST(et1); auto lca = [&] (int u, int v) -> int { int uu = tin[u]; int vv = tin[v]; if(uu > vv) swap(uu, vv); int g = ST.prod(uu, vv+1); return i_tin[g]; }; F0R(_, q) { int u, v; cin >> u >> v; u--; v--; int x = lca(u, v); int ads = id_e[x]; cout << ads << "\n"; } return 0; }
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