124 lines
2.4 KiB
C++
124 lines
2.4 KiB
C++
/* Problem URL: https://codeforces.com/contest/2108/problem/B */
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#include <bits/stdc++.h>
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using namespace std;
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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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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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int t;
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cin >> t;
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while (t--) {
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ll n, x;
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cin >> n >> x;
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if (x == 0) {
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if (n == 1) {
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cout << "-1\n";
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continue;
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}
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if (n & 1) {
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cout << n + 3 << '\n';
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continue;
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}
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cout << n << '\n';
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continue;
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}
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int count = __builtin_popcountll(x);
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if (n <= count) {
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cout << x << '\n';
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continue;
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}
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n -= count;
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if (n & 1) {
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if (count >= 2) {
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cout << n + 1 + x << '\n';
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continue;
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}
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ll ans = 1;
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while (x & ans) {
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ans <<= 1;
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}
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cout << n + ans * 2 + x - 1 << '\n';
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continue;
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}
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cout << n + x << '\n';
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}
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}
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