From a11df2c963520c64768158c2753237152a1eae3d Mon Sep 17 00:00:00 2001
From: Franciszek Malinka <franciszek.malinka@gmail.com>
Date: Sat, 17 Apr 2021 17:31:46 +0200
Subject: Update

---
 Semestr 4/aisd/pracownia4/rozw2.cpp | 135 ++++++++++++++++++++++++++++++++++++
 1 file changed, 135 insertions(+)
 create mode 100644 Semestr 4/aisd/pracownia4/rozw2.cpp

(limited to 'Semestr 4/aisd')

diff --git a/Semestr 4/aisd/pracownia4/rozw2.cpp b/Semestr 4/aisd/pracownia4/rozw2.cpp
new file mode 100644
index 0000000..17562a9
--- /dev/null
+++ b/Semestr 4/aisd/pracownia4/rozw2.cpp	
@@ -0,0 +1,135 @@
+#include <bits/stdc++.h>
+using namespace std;
+
+struct treap {
+    typedef long long T;
+    treap *left = nullptr;
+    treap *right = nullptr;
+    int rank, items = 1;
+    T value;
+    T sum;
+    bool rev = false;
+
+    treap(T val = T()) : rank(rand()), value(val), sum(val) {}
+
+    inline void update() {
+        if (rev) {
+            swap(left, right);
+            if (left)   left->rev   = !left->rev;
+            if (right)  right->rev  = !right->rev;
+            rev = false;
+        }
+    }
+};
+
+inline int items(treap *t) { return t ? t->items : 0; }
+inline int sum(treap *t)   { return t ? t->sum : 0; }
+inline void recalc(treap *t) { 
+    t->items = items(t->left) + items(t->right) + 1; 
+    t->sum   = sum(t->left) + sum(t->right) + t->value;
+}
+
+pair<treap*, treap*> split(treap *t, int k) {
+    if (!t) return {nullptr, nullptr};
+    t->update();
+    if (items(t->left) < k) {
+        auto p = split(t->right, k - items(t->left) - 1);
+        t->right = p.first;
+        recalc(t);
+        return {t, p.second};
+    }
+    else {
+        auto p = split(t->left, k);
+        t->right = p.first;
+        recalc(t);
+        return {p.first, t};
+    }
+}
+
+treap* merge(treap *a, treap *b) {
+    if (!a) return b;
+    if (!b) return a;
+    a->update();
+    b->update();
+    if (a->rank > b->rank) {
+        a->right = merge(a->right, b);
+        recalc(a);
+        return a;
+    }
+    else {
+        b->left = merge(a, b->left);
+        recalc(b);
+        return b;
+    }
+}
+
+treap::T select(treap *t, int k) {
+    if (!t) return treap::T();
+    t->update();
+    int i = items(t->left);
+    if (i == k)         return t->value;
+    else if (i > k)     return select(t->left, k);
+    else                return select(t->right, k - i - 1);
+}
+
+treap *insert (treap *t, treap::T val, int k) {
+    auto p = split(t, k);
+    return merge(merge(p.first, new treap(val)), p.second);
+}
+
+treap *erase(treap *t, int k) {
+    auto p1 = split(t, k);
+    auto p2 = split(p1.second, 1);
+    return merge(p1.first, p2.second);
+}
+
+treap::T sum(treap *t, int l, int r) {
+    auto p1 = split(t, r);
+    auto p2 = split(p1.first, l);
+    return sum(p2.second);
+} 
+
+void write(treap *t) {
+    if (!t) return;
+    t->update();
+    write(t->left);
+    cout << t->value << " ";
+    write(t->right);
+}
+void destroy(treap *t) {
+    if (!t) return;
+    destroy(t->left);
+    destroy(t->right);
+    delete t;
+}
+
+treap *t = 0;
+
+int main() {
+    int n;
+    scanf("%d", &n);
+    for (int i = 0; i < n; i++) {
+        char c;
+        scanf(" %c", &c);
+        if (c == 'I') {
+            int p, x;
+            scanf("%d%d", &p, &x);
+            t = insert(t, x, p);
+        }
+        if (c == 'D') {
+            int p;
+            scanf("%d", &p);
+            t = erase(t, p - 1);
+        }
+        if (c == 'S') {
+            int l, r;
+            scanf("%d%d", &l, &r);
+            printf("ans: %lld\n", sum(t, l, r));
+        }
+        cout << "Treap:\n";
+        write(t);
+        cout << "\n";
+    }
+
+    destroy(t);
+}
\ No newline at end of file
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