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147
BZOJ/2141/2141.cpp
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147
BZOJ/2141/2141.cpp
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#include <iostream>
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#include <algorithm>
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#include <vector>
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using std::cin;
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using std::cout;
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const char endl = '\n';
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const int N = 2e4 + 5;
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int n, m, h[N], ans;
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std::vector<int> nums;
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class SegmentTree {
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private:
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struct node {
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int l, r;
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int sum;
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node *lchild, *rchild;
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node(const int &_l = 0, const int &_r = 0)
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: l(_l), r(_r), sum(0), lchild(nullptr), rchild(nullptr) {}
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void pushup() {
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sum = 0;
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if (lchild != nullptr) sum += lchild->sum;
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if (rchild != nullptr) sum += rchild->sum;
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}
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};
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node *root;
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void modify(node *&cur, int l, int r, int pos, int val) {
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if (cur == nullptr) cur = new node(l, r);
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if (l == r) {
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cur->sum += val;
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return;
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}
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int mid = l + r >> 1;
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if (pos <= mid) modify(cur->lchild, l, mid, pos, val);
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else modify(cur->rchild, mid + 1, r, pos, val);
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cur->pushup();
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}
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int query(node *cur, int l, int r, int ql, int qr) {
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if (cur == nullptr) return 0;
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if (ql <= l && r <= qr) return cur->sum;
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int mid = l + r >> 1,
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res = 0;
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if (ql <= mid) res += query(cur->lchild, l, mid, ql, qr);
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if (qr > mid) res += query(cur->rchild, mid + 1, r, ql, qr);
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return res;
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}
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public:
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SegmentTree()
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: root(nullptr) {}
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void modify(int pos, int val) {
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modify(root, 1, n, pos, val);
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}
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int query(int ql, int qr) {
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return query(root, 1, n, ql, qr);
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}
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} tr[N];
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int lowbit(int x) {
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return x & -x;
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}
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void add(int x, int y, int z) {
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for (; x <= n; x += lowbit(x)) tr[x].modify(y, z);
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}
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int sum(int x, int l, int r) {
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int res = 0;
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for (; x; x -= lowbit(x)) res += tr[x].query(l, r);
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return res;
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}
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int get(int x) {
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return sum(x - 1, h[x] + 1, n) + sum(n, 1, h[x] - 1) - sum(x - 1, 1, h[x] - 1);
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}
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int find(int x) {
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return std::lower_bound(nums.begin(), nums.end(), x) - nums.begin() + 1;
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}
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int main() {
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std::ios::sync_with_stdio(false);
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cin.tie(nullptr);
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cin >> n;
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for (int i = 1; i <= n; i++) {
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cin >> h[i];
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nums.emplace_back(h[i]);
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}
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std::sort(nums.begin(), nums.end());
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std::transform(h + 1, h + 1 + n, h + 1, find);
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for (int i = 1; i <= n; i++) {
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add(i, h[i], 1);
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ans += sum(i - 1, h[i] + 1, n);
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}
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cout << ans << endl;
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cin >> m;
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while (m--) {
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int x, y;
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cin >> x >> y;
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if (x > y) std::swap(x, y);
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if (h[x] > h[y]) ans++;
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ans -= get(x) + get(y);
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add(x, h[x], -1);
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add(y, h[y], -1);
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std::swap(h[x], h[y]);
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if (h[x] > h[y]) ans--;
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add(x, h[x], 1);
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add(y, h[y], 1);
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ans += get(x) + get(y);
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cout << ans << endl;
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}
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return 0;
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}
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