Add a bunch of other problems.

Testing Round 20 (Unrated, Communication Problems)/B. Locate.cpp

@@ -0,0 +1,181 @@
+/* Problem URL: https://codeforces.com/contest/2168/problem/B */
+
+#include <bits/stdc++.h>
+#include <ext/pb_ds/assoc_container.hpp>
+#include <ext/pb_ds/tree_policy.hpp>
+
+using namespace std;
+using namespace __gnu_pbds;
+
+template <class T, class comp = less<>>
+using ordered_set = tree<T, null_type , comp , rb_tree_tag , tree_order_statistics_node_update>;
+
+#define V vector
+
+#define rmin(a, b) a = min(a, b)
+#define rmax(a, b) a = max(a, b)
+
+#define rep(i, lim) for (int i = 0; i < (lim); i++)
+#define nrep(i, s, lim) for (int i = s; i < (lim); i++)
+
+#define repv(i, v) for (auto &i : (v))
+#define fillv(v) for (auto &itr_ : (v)) { cin >> itr_; }
+#define sortv(v) sort(v.begin(), v.end())
+#define all(v) (v).begin(), (v).end()
+
+using vi = vector<int>;
+using vvi = vector<vi>;
+using vvvi = vector<vvi>;
+using vvvvi = vector<vvvi>;
+
+using ll = long long;
+
+using vl = vector<ll>;
+using vvl = vector<vl>;
+using vvvl = vector<vvl>;
+using vvvvl = vector<vvvl>;
+
+template<class v>
+auto operator<<(ostream &os, const vector<v> &vec)->ostream& {
+    os << vec[0];
+    for (size_t i = 1; i < vec.size(); i++) {
+        os << ' ' << vec[i];
+    }
+    os << '\n';
+    return os;
+}
+
+template<class v>
+auto operator>>(istream &is, vector<v> &vec)->istream& {
+    for (auto &i : vec) {
+        is >> i;
+    }
+    return is;
+}
+
+template<class v>
+auto operator<<(ostream &os, const vector<vector<v>> &vec)->ostream& {
+    for (auto &i : vec) {
+        os << i[0];
+        for (size_t j = 1; j < i.size(); j++) {
+            os << ' ' << i[j];
+        }
+        os << '\n';
+    }
+    return os;
+}
+
+template<class v>
+auto operator>>(istream  &is, vector<vector<v>> &vec)->istream& {
+    for (auto &i : vec) {
+        for (auto &j : i) {
+            is >> j;
+        }
+    }
+    return is;
+}
+
+const int oo = INT32_MAX >> 1;
+const ll OO = INT64_MAX >> 1;
+
+
+void pre()
+{
+
+}
+
+#define TEST 1
+
+void solve1()
+{
+    int n;
+    cin >> n;
+    vi a(n);
+    cin >> a;
+
+    int pos1;
+    int pos2;
+
+    rep(i, n) {
+        if (a[i] == 1) {
+            pos1 = i;
+            continue;
+        }
+
+        if (a[i] == n) {
+            pos2 = i;
+        }
+    }
+
+    cout << (pos1 < pos2) << '\n';
+}
+
+void solve2()
+{
+    int n, x;
+    cin >> n >> x;
+
+    int low = 0;
+    int high = n - 1;
+    int l = 1;
+    while (low <= high) {
+        int mid = (low + high) >> 1;
+
+        cout << "? " << mid + 1 << ' ' << n << endl;
+        int ans;
+        cin >> ans;
+
+        if (ans == n - 1) {
+            l = mid + 1;
+            low = mid + 1;
+            continue;
+        }
+
+        high = mid - 1;
+    }
+
+    low = 0;
+    high = n - 1;
+    int r = n;
+    while (low <= high) {
+        int mid = (low + high) >> 1;
+
+        cout << "? 1 " << mid + 1 << endl;
+        int ans;
+        cin >> ans;
+
+        if (ans == n - 1) {
+            r = mid + 1;
+            high = mid - 1;
+            continue;
+        }
+
+        low = mid + 1;
+    }
+
+    if (x) {
+        cout << "! " << r << endl;
+        return;
+    }
+
+    cout << "! " << l << endl;
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    void (*solve[])() = {solve1, solve2};
+    string op;
+    cin >> op;
+    bool s = op[0] != 'f';
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve[s]();
+    }
+}