191 lines
3.9 KiB
C++
191 lines
3.9 KiB
C++
/* Problem URL: https://codeforces.com/problemset/problem/1747/D */
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#include <bits/stdc++.h>
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#include <ext/pb_ds/assoc_container.hpp>
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#include <ext/pb_ds/tree_policy.hpp>
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using namespace std;
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using namespace __gnu_pbds;
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template <class T, class comp = less<>>
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using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
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#define V vector
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#define rmin(a, b) a = min(a, b)
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#define rmax(a, b) a = max(a, b)
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#define rep(i, lim) for (int i = 0; i < (lim); i++)
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#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
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#define repv(i, v) for (auto &i : (v))
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#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
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#define sortv(v) sort(v.begin(), v.end())
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#define all(v) (v).begin(), (v).end()
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using vi = vector<int>;
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using vvi = vector<vi>;
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using vvvi = vector<vvi>;
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using vvvvi = vector<vvvi>;
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using ll = long long;
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using vl = vector<ll>;
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using vvl = vector<vl>;
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using vvvl = vector<vvl>;
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using vvvvl = vector<vvvl>;
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template<class v>
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auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
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os << vec[0];
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for (size_t i = 1; i < vec.size(); i++) {
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os << ' ' << vec[i];
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}
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os << '\n';
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return os;
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}
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template<class v>
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auto operator>>(istream &is, vector<v> &vec)->istream& {
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for (auto &i : vec) {
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is >> i;
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}
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return is;
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}
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template<class v>
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auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
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for (auto &i : vec) {
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os << i[0];
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for (size_t j = 1; j < i.size(); j++) {
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os << ' ' << i[j];
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}
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os << '\n';
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}
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return os;
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}
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template<class v>
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auto operator>>(istream &is, vector<vector<v>> &vec)->istream& {
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for (auto &i : vec) {
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for (auto &j : i) {
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is >> j;
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}
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}
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return is;
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}
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const int oo = INT32_MAX >> 1;
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const ll OO = INT64_MAX >> 1;
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void pre()
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{
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}
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#define TEST 0
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void solve()
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{
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int n, q;
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cin >> n >> q;
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vi a(n);
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cin >> a;
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vi pref(n + 1);
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vi zero(n + 1);
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unordered_map<int, vi> var;
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unordered_map<int, vi> odd;
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unordered_map<int, vi> even;
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rep(i, n) {
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pref[i + 1] = pref[i] ^ a[i];
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zero[i + 1] = zero[i] + (a[i] == 0);
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var[pref[i + 1]].push_back(i);
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if (i & 1) {
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odd[pref[i + 1]].push_back(i);
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} else {
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even[pref[i + 1]].push_back(i);
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}
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}
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while (q--) {
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int l, r;
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cin >> l >> r;
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l--, r--;
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if (zero[r + 1] - zero[l] == r - l + 1) {
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cout << "0\n";
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continue;
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}
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if (r - l <= 1) {
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cout << "-1\n";
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continue;
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}
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int xo = pref[r + 1] ^ pref[l];
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if (xo != 0) {
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cout << "-1\n";
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continue;
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}
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if ((r - l + 1) & 1) {
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cout << "1\n";
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continue;
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}
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auto fds = var.find(pref[r + 1]);
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if (fds == var.end()) {
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cout << "-1\n";
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}
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vi &tmp = fds->second;
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auto one = lower_bound(all(tmp), l);
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auto two = lower_bound(all(tmp), r);
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if (two != tmp.begin()) {
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two--;
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}
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if ((one != tmp.end() && *one == l) || (two != tmp.end() && *two == r - 1)) {
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cout << "1\n";
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continue;
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}
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if (r & 1) {
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vi &act = even[pref[r + 1]];
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auto itr = lower_bound(all(act), l);
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if (itr == act.end() || *itr > r) {
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cout << "-1\n";
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continue;
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}
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} else {
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vi &act = odd[pref[r + 1]];
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auto itr = lower_bound(all(act), l);
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if (itr == act.end() || *itr > r) {
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cout << "-1\n";
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continue;
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}
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}
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cout << "2\n";
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}
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}
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int main()
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{
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ios::sync_with_stdio(false);
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cin.tie(nullptr);
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pre();
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int t;
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(TEST && cin >> t) || (t = 1);
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while (t--) {
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solve();
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}
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}
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