137 lines
2.8 KiB
C++
137 lines
2.8 KiB
C++
/* Problem URL: https://codeforces.com/contest/2106/problem/D */
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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 (size_t i = 0; i < (lim); i++)
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#define nrep(i, s, lim) for (size_t 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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int n, m;
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cin >> n >> m;
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vl a(n);
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cin >> a;
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vl b(m);
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cin >> b;
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b.push_back(0);
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vi pref(m, -1);
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vi suf(m, -1);
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int now = 0;
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for (int i = 0; i < n && now < m; i++) {
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if (a[i] >= b[now]) {
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pref[now] = i;
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now++;
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}
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}
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now = m - 1;
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for (int i = n - 1; i >= 0 && now >= 0; i--) {
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if (a[i] >= b[now]) {
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suf[now] = i;
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now--;
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}
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}
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ll ans = INT64_MAX >> 1;
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if (pref.back() != -1) {
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cout << "0\n";
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continue;
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}
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if (m == 1) {
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cout << b[0] << '\n';
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continue;
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}
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if (pref[m - 1] == -1 && pref[m - 2] != -1) {
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rmin(ans, b[m - 1]);
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}
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if (suf[1] != -1 && suf[0] == -1) {
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rmin(ans, b[0]);
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}
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for (int i = 1; i < m - 1; i++) {
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if (pref[i - 1] != -1 && suf[i + 1] != -1 && pref[i - 1] < suf[i + 1]) {
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rmin(ans, b[i]);
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}
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}
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cout << (ans == INT64_MAX >> 1 ? -1 : ans) << '\n';
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}
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}
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