diff --git a/Codeforces Round 1074 (Div. 4)/F. BattleCows.cpp b/Codeforces Round 1074 (Div. 4)/F. BattleCows.cpp
new file mode 100644
index 0000000..35ba141
--- /dev/null
+++ b/Codeforces Round 1074 (Div. 4)/F. BattleCows.cpp	
@@ -0,0 +1,155 @@
+/* Problem URL: https://codeforces.com/problemset/problem/2185/F */
+
+#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 solve()
+{
+    int n, q;
+    cin >> n >> q;
+    int sz = 1 << n;
+
+    vl a(sz);
+    cin >> a;
+
+    vl an(sz * 2);
+
+    function<ll(int)> calc = [&](int i) {
+        if (i >= sz) {
+            an[i] = a[i - sz];
+            return an[i];
+        }
+
+        ll a1 = calc(i * 2);
+        ll a2 = calc(i * 2 + 1);
+
+        an[i] = a1 ^ a2;
+        return an[i];
+    };
+
+    calc(1);
+
+    while (q--) {
+        int b, c;
+        cin >> b >> c;
+
+        ll ans = 0;
+        ll cur = a[b - 1];
+        bool add = false;
+        int st = 0;
+        b += sz;
+        b--;
+
+        while (b > 1) {
+            int now = b & 1;
+            b >>= 1;
+
+            ll cur = an[(b << 1) + (now ^ 1)];
+            if (cur > c || (cur == c && now)) {
+                ans += 1 << st;
+            }
+
+            st++;
+            c ^= cur;
+        }
+        
+        cout << ans << '\n';
+    }
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}
diff --git a/Codeforces Round 957 (Div. 3)/F. Valuable Cards.cpp b/Codeforces Round 957 (Div. 3)/F. Valuable Cards.cpp
new file mode 100644
index 0000000..3fae126
--- /dev/null
+++ b/Codeforces Round 957 (Div. 3)/F. Valuable Cards.cpp	
@@ -0,0 +1,137 @@
+/* Problem URL: https://codeforces.com/problemset/problem/1992/F */
+
+#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 solve()
+{
+    int n, x;
+    cin >> n >> x;
+
+    vi a(n);
+    cin >> a;
+
+    set<int> ev;
+    ev.insert(x);
+
+    int ans = 1;
+    rep(i, n) {
+        set<int> tmp = ev;
+        repv(j, ev) {
+            if (j % a[i] == 0) {
+                tmp.insert(j / a[i]);
+            }
+        }
+
+        if (tmp.count(1)) {
+            ans++;
+            ev.clear();
+            ev.insert(x);
+            if (x % a[i] == 0) {
+                ev.insert(x / a[i]);
+            }
+            continue;
+        }
+
+        swap(ev, tmp);
+    }
+
+    cout << ans << '\n';
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}
diff --git a/Codeforces Round 976 (Div. 2) and Divide By Zero 9.0/C. Bitwise Balancing.cpp b/Codeforces Round 976 (Div. 2) and Divide By Zero 9.0/C. Bitwise Balancing.cpp
new file mode 100644
index 0000000..c8c3c6d
--- /dev/null
+++ b/Codeforces Round 976 (Div. 2) and Divide By Zero 9.0/C. Bitwise Balancing.cpp	
@@ -0,0 +1,139 @@
+/* Problem URL: https://codeforces.com/problemset/problem/2020/C */
+
+#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 solve()
+{
+    ll b, c, d;
+    cin >> b >> c >> d;
+
+    ll ans = 0;
+    rep(i, 61) {
+        int bi = (b >> i) & 1;
+        int ci = (c >> i) & 1;
+        ll di = (d >> i) & 1;
+
+        if (bi && ci) {
+            ans |= (di^1) << i;
+            continue;
+        }
+
+        if (bi && !ci) {
+            if (!di) {
+                cout << "-1\n";
+                return;
+            }
+            continue;
+        }
+
+        if (!bi && ci) {
+            if (di) {
+                cout << "-1\n";
+                return;
+            }
+            continue;
+        }
+
+        ans |= di << i;
+    }
+    
+    cout << ans << '\n';
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}
diff --git a/Hello 2023/C. Least Prefix Sum.cpp b/Hello 2023/C. Least Prefix Sum.cpp
new file mode 100644
index 0000000..ba0d6d4
--- /dev/null
+++ b/Hello 2023/C. Least Prefix Sum.cpp	
@@ -0,0 +1,160 @@
+/* Problem URL: https://codeforces.com/problemset/problem/1779/C */
+
+#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 solve()
+{
+    int n, m;
+    cin >> n >> m;
+
+    vl a(n);
+    cin >> a;
+
+    m--;
+
+    int ans = 0;
+    vl pref(n + 1);
+
+    nrep(i, 1, n + 1) {
+        pref[i] = pref[i - 1] + a[i - 1];
+    }
+    pref[0] = OO;
+
+    priority_queue<pair<ll, int>> pq;
+
+    ll cur = pref[m + 1];
+    for (int i = m; i >= 0; i--) {
+        pq.emplace(a[i], i);
+
+        while (cur > pref[i]) {
+            auto [c, j] = pq.top();
+            pq.pop();
+            a[j] = -a[j];
+            cur -= c * 2;
+            ans++;
+        }
+    }
+
+    while (!pq.empty()) {
+        pq.pop();
+    }
+
+    pref[0] = 0;
+    nrep(i, 1, n + 1) {
+        pref[i] = pref[i - 1] + a[i - 1];
+    }
+
+    priority_queue<ll, vl, greater<>> mpq;
+
+    cur = pref[m + 1];
+    nrep(i, m + 1, n) {
+        cur += a[i];
+        mpq.push(a[i]);
+
+        while (cur < pref[m + 1]) {
+            cur -= mpq.top() * 2;
+            mpq.pop();
+            ans++;
+        }
+    }
+
+    cout << ans << '\n';
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}