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