// >>> TEMPLATES #include using namespace std; using ll = long long; using ld = long double; using i32 = int32_t; using i64 = int64_t; using u32 = uint32_t; using u64 = uint64_t; #define int ll #define rep(i, n) for (int i = 0; i < (int)(n); i++) #define rep1(i, n) for (int i = 1; i <= (int)(n); i++) #define repR(i, n) for (int i = (int)(n)-1; i >= 0; i--) #define rep1R(i, n) for (int i = (int)(n); i >= 1; i--) #define loop(i, a, B) for (int i = a; i B; i++) #define loopR(i, a, B) for (int i = a; i B; i--) #define all(x) begin(x), end(x) #define allR(x) rbegin(x), rend(x) #define rng(x, l, r) begin(x) + (l), begin(x) + (r) #define pb push_back #define eb emplace_back #define fst first #define snd second template auto mp(A &&a, B &&b) { return make_pair(forward(a), forward(b)); } template auto mt(T&&... x) { return make_tuple(forward(x)...); } template auto constexpr inf_ = numeric_limits::max()/2-1; auto constexpr INF32 = inf_; auto constexpr INF64 = inf_; auto constexpr INF = inf_; #ifdef LOCAL #include "debug.hpp" #else #define dump(...) (void)(0) #define say(x) (void)(0) #define debug if (0) #endif template struct pque : priority_queue, Comp> { vector &data() { return this->c; } void clear() { this->c.clear(); } }; template using pque_max = pque>; template using pque_min = pque>; template ::value, int> = 0> ostream& operator<<(ostream& os, T const& a) { bool f = true; for (auto const& x : a) os << (f ? "" : " ") << x, f = false; return os; } template ::value, int> = 0> ostream& operator<<(ostream& os, const T (&a)[N]) { bool f = true; for (auto const& x : a) os << (f ? "" : " ") << x, f = false; return os; } template ())), class = typename enable_if::value>::type> istream& operator>>(istream& is, T &a) { for (auto& x : a) is >> x; return is; } template ostream& operator<<(ostream& os, pair const& p) { return os << p.first << " " << p.second; } template istream& operator>>(istream& is, pair& p) { return is >> p.first >> p.second; } struct IOSetup { IOSetup() { cin.tie(nullptr); ios::sync_with_stdio(false); cout << fixed << setprecision(15); } } iosetup; template struct FixPoint : private F { constexpr FixPoint(F&& f) : F(forward(f)) {} template constexpr auto operator()(T&&... x) const { return F::operator()(*this, forward(x)...); } }; struct MakeFixPoint { template constexpr auto operator|(F&& f) const { return FixPoint(forward(f)); } }; #define MFP MakeFixPoint()| #define def(name, ...) auto name = MFP [&](auto &&name, __VA_ARGS__) template struct vec_impl { using type = vector::type>; template static type make_v(size_t n, U&&... x) { return type(n, vec_impl::make_v(forward(x)...)); } }; template struct vec_impl { using type = T; static type make_v(T const& x = {}) { return x; } }; template using vec = typename vec_impl::type; template auto make_v(Args&&... args) { return vec_impl::make_v(forward(args)...); } template void quit(T const& x) { cout << x << endl; exit(0); } template constexpr bool chmin(T& x, U const& y) { if (x > y) { x = y; return true; } return false; } template constexpr bool chmax(T& x, U const& y) { if (x < y) { x = y; return true; } return false; } template constexpr auto sumof(It b, It e) { return accumulate(b, e, typename iterator_traits::value_type{}); } template int sz(T const& x) { return x.size(); } template int lbd(C const& v, T const& x) { return lower_bound(begin(v), end(v), x)-begin(v); } template int ubd(C const& v, T const& x) { return upper_bound(begin(v), end(v), x)-begin(v); } const int dx[] = { 1, 0, -1, 0, 1, -1, -1, 1 }; const int dy[] = { 0, 1, 0, -1, 1, 1, -1, -1 }; constexpr int popcnt(ll x) { return __builtin_popcountll(x); } template pair operator+(pair const& p, pair const& q) { return { p.first + q.first, p.second + q.second }; } template pair operator-(pair const& p, pair const& q) { return { p.first - q.first, p.second - q.second }; } mt19937_64 seed_{random_device{}()}; template Int rand(Int a, Int b) { return uniform_int_distribution(a, b)(seed_); } i64 irand(i64 a, i64 b) { return rand(a, b); } // [a, b] u64 urand(u64 a, u64 b) { return rand(a, b); } // template void shuffle(It l, It r) { shuffle(l, r, seed_); } // <<< // >>> block cut tree #ifndef EDGE_INFO #define EDGE_INFO constexpr int dest(int v) { return v; } template ().to)> constexpr int dest(E const& e) { return e.to; } constexpr int cost(int) { return 1; } template ().cost)> constexpr auto cost(E const& e) { return e.cost; } template using cost_t = decltype(cost(declval())); #endif template struct BlockCutTree { const int n; vector>> block; // pair : minmax vector cut; // cut vertecies vector id; // not cut and in kth blcok -> k, kth cut -> block.size() + k vector> tree; // block cut tree BlockCutTree(vector> const& g) : n(g.size()) { build_block_cut(g); build_id_tree(); } bool is_cut(int x) const { return id[x] >= (int)block.size(); } void build_block_cut(vector> const& g) { using i32 = int32_t; i32 time = 0; vector ord(n, -1), low(n); vector> st; auto dfs = [&](auto dfs, i32 x, i32 p) -> void { low[x] = ord[x] = time++; i32 ch = 0; bool is_cut = false; for (auto const& e : g[x]) { const i32 y = dest(e); if (y == p or ord[y] >= ord[x]) continue; st.emplace_back(minmax(x, y)); if (ord[y] >= 0) { chmin(low[x], ord[y]); continue; } ch++; dfs(dfs, y, x); chmin(low[x], low[y]); if (low[y] >= ord[x]) { is_cut |= p >= 0; i32 i = st.size(); const pair xy = minmax(x, y); while (--i >= 0 and st[i] != xy) { } block.emplace_back(st.begin() + i, st.end()); st.resize(i); } } is_cut |= p < 0 and ch > 1; if (is_cut) cut.push_back(x); }; rep (x, g.size()) if (ord[x] < 0) dfs(dfs, x, -1); reverse(block.begin(), block.end()); } void build_id_tree() { const int32_t B = block.size(), C = cut.size(); vector last(C, -1); id.resize(n, -1); tree.resize(B+C); rep (i, C) id[cut[i]] = B + i; rep (i, B) for (auto [x, y] : block[i]) { for (int v : {x, y}) { if (id[v] < B) { id[v] = i; } else if (exchange(last[id[v]-B], i) < i) { tree[i].push_back(id[v]); tree[id[v]].push_back(i); } } } } }; // <<< // >>> LCA (RMQ) #ifndef EDGE_INFO #define EDGE_INFO constexpr int dest(int v) { return v; } template ().to)> constexpr int dest(E const& e) { return e.to; } constexpr int cost(int) { return 1; } template ().cost)> constexpr auto cost(E const& e) { return e.cost; } template using cost_t = decltype(cost(declval())); #endif template struct LCA { vector> const* g; int32_t n, root; vector id; vector> d; RMQ rmq; LCA() {} LCA(vector> const* g, int root) : g(g), n(g->size()), root(root), id(n), d(n) { vector> a; a.reserve(n-1); auto dfs = [&](auto dfs, int x, int p, int d0, cost_t d1) -> void { id[x] = a.size(); d[x] = d1; for (auto const& e : (*g)[x]) { if (dest(e) == p) continue; a.emplace_back(d0, x); dfs(dfs, dest(e), x, d0 + 1, d1 + cost(e)); } }; dfs(dfs, root, -1, 0, 0); rmq = RMQ(a); } cost_t dep(int a) const { return d[a]; } int operator()(int a, int b) const { return lca(a, b); } int lca(int a, int b) const { if (a == b) return a; if (id[a] > id[b]) swap(a, b); return rmq.get(id[a], id[b]).second; } cost_t dist(int a, int b) const { return d[a] + d[b] - 2*d[lca(a, b)]; } }; namespace RMQ { // >>> DST template struct DST : Handler { using Value = typename Handler::Value; using Handler::unit; // () -> Value using Handler::merge; // (Value, Value) -> Value static constexpr int bsr(int32_t x) { return x ? 31-__builtin_clz(x) : -1; } vector> v; DST() {} template DST(T&&... x) { build(forward(x)...); } void build(int n) { build(n, unit()); } void build(int n, Value const& x) { build(n, [&](int) { return x; }); } void build(vector const& v) { build(v.size(), [&](int i) { return v[i]; }); } template ()(0))> void build(int n, F gen) { assert(n >= 0); v.resize(1); v[0].resize(n, unit()); for (int i = 0; i < n; i++) v[0][i] = gen(i); if (n <= 1) return; const int lg = __lg(2*n-1); v.resize(lg, vector(n, unit())); for (int h = 1; h < lg; ++h) { const int w = 1<= b-w; --j) { v[h][j] = x = merge(v[0][j], x); } x = unit(); for (int j = b; j < min(n, b+w); ++j) { v[h][j] = x = merge(x, v[0][j]); } } } } int size() const { return v.empty() ? 0 : v[0].size(); } Value get(int l, int r) const { assert(0 <= l); assert(l <= r); assert(r <= size()); if (l == r) return unit(); --r; if (l == r) return v[0][l]; const int h = bsr(l^r); return merge(v[h][l], v[h][r]); } Value operator[](int idx) const { assert(0 <= idx); assert(idx < size()); return v[0][idx]; } }; // <<< struct Min { using Value = pair; static constexpr auto inf = numeric_limits::max(); constexpr static Value unit() { return { inf, inf }; } constexpr static Value merge(Value const& x, Value const& y) { return min(x, y); } }; using RMQ = DST; } template auto get_lca(vector> const& g, int root = 0) { return LCA(&g, root); } // <<< int32_t main() { int n, m; cin >> n >> m; vector> g(n); rep (i, m) { int a, b; cin >> a >> b; --a, --b; g[a].eb(b); g[b].eb(a); } auto bc = BlockCutTree(g); auto lca = get_lca(bc.tree); int q; cin >> q; rep (_, q) { int x, y; cin >> x >> y; x--, y--; if (x == y) { cout << 0 << "\n"; } else { int d = lca.dist(bc.id[x], bc.id[y]); if (bc.is_cut(x)) d--; if (bc.is_cut(y)) d--; assert(d % 2 == 0); cout << d/2 << "\n"; } } }