More problems

Codeforces Round 1079 (Div. 1)/B. Another Problem about Beautiful Pairs.cpp

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+/* Problem URL: https://codeforces.com/problemset/problem/2196/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 solve()
+{
+    int n;
+    cin >> n;
+
+    vl a(n);
+    cin >> a;
+
+    int b = sqrt(n) + 1;
+
+    ll ans = 0;
+    rep(i, n) {
+        if (a[i] >= b) {
+            for (int k = 1; i + k * a[i] < n; k++) {
+                if (k == a[i + k * a[i]]) {
+                    ans++;
+                }
+            }
+
+            for (int k = -1; i + k * a[i] >= 0; k--) {
+                if (-k == a[i + k * a[i]]) {
+                    ans++;
+                }
+            }
+
+            continue;
+        }
+
+        for (int k = 1; k < b && i + k * a[i] < n; k++) {
+            if (k == a[i + k * a[i]]) {
+                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();
+    }
+}

Codeforces Round 945 (Div. 2)/C. Cat, Fox and Double Maximum.cpp

@@ -0,0 +1,171 @@
+/* Problem URL: https://codeforces.com/problemset/problem/1973/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;
+    cin >> n;
+
+    vi p(n);
+    cin >> p;
+
+    vi ans;
+    int best = 0;
+
+    priority_queue<pair<int, int>> mi;
+    priority_queue<pair<int, int>, V<pair<int, int>>, greater<>> ma;
+
+    auto getans = [&]() -> pair<vi, int> {
+        vi t(n);
+
+        int now = 1;
+        while (!mi.empty()) {
+            auto [c, i] = mi.top();
+            mi.pop();
+            t[i] = now;
+            now++;
+        }
+
+        now = n;
+        while (!ma.empty()) {
+            auto [c, i] = ma.top();
+            ma.pop();
+            t[i] = now;
+            now--;
+        }
+
+        int ans = 0;
+        nrep(i, 1, n - 1) {
+            ans += t[i] + p[i] > max(t[i + 1] + p[i + 1], t[i - 1] + p[i - 1]);
+        }
+
+        return {t, ans};
+    };
+
+    rep(i, n) {
+        if (i & 1) {
+            mi.emplace(p[i], i);
+        } else {
+            ma.emplace(p[i], i);
+        }
+    }
+
+    auto [t, v] = getans();
+    swap(ans, t);
+    best = v;
+
+    rep(i, n) {
+        if (i & 1) {
+            ma.emplace(p[i], i);
+        } else {
+            mi.emplace(p[i], i);
+        }
+    }
+
+    auto [t2, v2] = getans();
+    if (v2 > best) {
+        swap(ans, t2);
+        best = v2;
+    }
+
+    cout << ans;
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}

Helvetic Coding Contest 2024 online mirror (teams allowed, unrated)/G1. Min-Fund Prison (Easy).cpp

@@ -0,0 +1,135 @@
+/* Problem URL: https://codeforces.com/problemset/problem/1970/G1 */
+
+#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;
+    ll c;
+    cin >> n >> m >> c;
+
+    vvi graph(n);
+    while (m--) {
+        int a, b;
+        cin >> a >> b;
+        a--, b--;
+        graph[a].push_back(b);
+        graph[b].push_back(a);
+    }
+
+    ll ans = OO;
+    function<ll(int, int)> dfs = [&](int i, int p) {
+        ll c = 1;
+        repv(j, graph[i]) {
+            if (j == p) {
+                continue;
+            }
+
+            c += dfs(j, i);
+        }
+
+        rmin(ans, c * c + (n - c) * (n - c));
+        return c;
+    };
+
+    dfs(0, 0);
+    cout << ans << '\n';
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}

Rayan Programming Contest 2024 - Selection (Codeforces Round 989, Div. 1 + Div. 2)/C. Trapped in the Witch's Labyrinth.cpp

@@ -0,0 +1,184 @@
+/* Problem URL: https://codeforces.com/problemset/problem/2034/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;
+
+    V<string> a(n);
+    cin >> a;
+
+    V<V<bool>> loop(n, V<bool>(m));
+
+    map<char, array<int, 2>> var;
+    var['U'] = {-1, 0};
+    var['D'] = {1, 0};
+    var['L'] = {0, -1};
+    var['R'] = {0, 1};
+
+    V<V<bool>> vis(n, V<bool>(m));
+    V<V<bool>> frame(n, V<bool>(m));
+
+    function<int(int, int)> dfs = [&](int i, int j) {
+        if (i < 0 || i >= n || j < 0 || j >= m) {
+            return false;
+        }
+
+        if (frame[i][j] || loop[i][j]) {
+            loop[i][j] = true;
+            return true;
+        }
+
+        if (vis[i][j]) {
+            return false;
+        }
+
+        vis[i][j] = true;
+        frame[i][j] = true;
+
+        if (a[i][j] == '?') {
+            repv(k, var) {
+                int id = i + k.second[0];
+                int jd = j + k.second[1];
+
+                if (dfs(id, jd)) {
+                    a[i][j] = k.first;
+                    loop[i][j] = true;
+                    frame[i][j] = false;
+                    return true;
+                }
+            }
+
+            frame[i][j] = false;
+            return false;
+        }
+
+        auto [c, k] = var[a[i][j]];
+        int id = i + c;
+        int jd = j + k;
+
+        if (dfs(id, jd)) {
+            loop[i][j] = true;
+            frame[i][j] = false;
+            return true;
+        }
+
+        frame[i][j] = false;
+        return false;
+    };
+
+    rep(i, n) {
+        rep(j, m) {
+            dfs(i, j);
+        }
+    }
+
+    int ans = 0;
+    rep(i, n) {
+        rep(j, m) {
+            ans += loop[i][j];
+        }
+    }
+
+    cout << ans << '\n';
+}
+
+int main()
+{
+    ios::sync_with_stdio(false);
+    cin.tie(nullptr);
+
+    pre();
+
+    int t;
+    (TEST && cin >> t) || (t = 1);
+    while (t--) {
+        solve();
+    }
+}