#include // #include using namespace std; // using namespace atcoder; #define DEBUG(x) cerr<<#x<<": "< #define vl vector #define vii vector< vector > #define vll vector< vector > #define vs vector #define pii pair #define pis pair #define psi pair #define pll pair template pair operator+(const pair &s, const pair &t) { return pair(s.first + t.first, s.second + t.second); } template pair operator-(const pair &s, const pair &t) { return pair(s.first - t.first, s.second - t.second); } template ostream& operator<<(ostream& os, pair p) { os << "(" << p.first << ", " << p.second << ")"; return os; } #define X first #define Y second #define rep(i,n) for(int i=0;i<(int)(n);i++) #define rep1(i,n) for(int i=1;i<=(int)(n);i++) #define rrep(i,n) for(int i=(int)(n)-1;i>=0;i--) #define rrep1(i,n) for(int i=(int)(n);i>0;i--) #define REP(i,a,b) for(int i=a;i bool chmax(T &a, const T &b) { if (a bool chmin(T &a, const T &b) { if (a>b) { a = b; return 1; } return 0; } #define UNIQUE(v) v.erase(std::unique(v.begin(), v.end()), v.end()); const ll inf = 1000000001; const ll INF = (ll)1e18 + 1; const long double pi = 3.1415926535897932384626433832795028841971L; #define Sp(p) cout< class LazySegmentTree { public: using F = function; // query_func using G = function; // update_func using H = function; // lazy to node (node, lazy, left, right) int n; vector node; vector lazy; T1 e1; T2 e2; F query_func; G update_func; H eval_func; LazySegmentTree(){} LazySegmentTree(vector a, F query_func, G update_func, H eval_func, T1 e1, T2 e2) :query_func(query_func), update_func(update_func), eval_func(eval_func), e1(e1), e2(e2) { int _n = a.size(); n = 1; while (n < _n) n *= 2; node.resize(2 * n - 1, e1); lazy.resize(2 * n - 1, e2); for (int i = 0; i < _n; i++) node[i + n - 1] = a[i]; for (int i = n - 2; i >= 0; i--) { node[i] = query_func(node[i * 2 + 1], node[i * 2 + 2]); } } // k�Ԗڂ̃m�[�h�ɂ‚��Ēx���]�����s�� inline void eval(int k, int l, int r) { if (lazy[k] != e2) { // Change node[k] = eval_func(node[k], lazy[k], l, r); if (r - l > 1) { lazy[2 * k + 1] = update_func(lazy[2*k + 1], lazy[k]); lazy[2 * k + 2] = update_func(lazy[2*k + 2], lazy[k]); } lazy[k] = e2; // Change } } // [a, b)��x�ɂ��� void update(int a, int b, T2 x, int k, int l, int r) { // k �Ԗڂ̃m�[�h�ɑ΂��Ēx���]�����s�� eval(k, l, r); if (b <= l || r <= a) return; if (a <= l && r <= b) { lazy[k] = update_func(lazy[k], x); eval(k, l, r); } else { update(a, b, x, 2 * k + 1, l, (l + r) / 2); update(a, b, x, 2 * k + 2, (l + r) / 2, r); node[k] = query_func(node[2 * k + 1], node[2 * k + 2]); } } T1 query(int a, int b, int k, int l, int r) { eval(k, l, r); if (b <= l || r <= a) return e1; if (a <= l && r <= b) return node[k]; T1 resl = query(a, b, 2 * k + 1, l, (l + r) / 2); T1 resr = query(a, b, 2 * k + 2, (l + r) / 2, r); return query_func(resl, resr); } }; vi a; const int N = 20000; struct Mo { vector< int > left, right, order; vector< bool > v; int width; int nl, nr, ptr; ll inv1; LazySegmentTree left_num, right_num, yaba; Mo(int n) : width((int) sqrt(n)), nl(0), nr(0), ptr(0), v(n), inv1(0) {} void insert(int l, int r) /* [l, r) */ { left.push_back(l); right.push_back(r); } /* ソート */ void build() { order.resize(left.size()); iota(begin(order), end(order), 0); sort(begin(order), end(order), [&](int a, int b) { if(left[a] / width != left[b] / width) return left[a] < left[b]; return right[a] < right[b]; }); } /* クエリを 1 つぶんすすめて, クエリのidを返す */ int process() { if(ptr == order.size()) return (-1); const auto id = order[ptr]; while(nl > left[id]) distribute_left(--nl); while(nr < right[id]) distribute_right(nr++); while(nl < left[id]) distribute_left(nl++); while(nr > right[id]) distribute_right(--nr); return (order[ptr++]); } inline void distribute_right(int idx) { v[idx].flip(); if(v[idx]) add_right(idx); else del_right(idx); } inline void distribute_left(int idx) { v[idx].flip(); if(v[idx]) add_left(idx); else del_left(idx); } void add_right(int idx) { int x = a[idx]; inv1 -= right_num.query(0, x, 0, 0, right_num.n); inv1 -= left_num.query(x + 1, N, 0, 0, left_num.n); right_num.update(x, x + 1, -1, 0, 0, right_num.n); yaba.update(x + 1, N, -1, 0, 0, yaba.n); } void del_right(int idx) { int x = a[idx]; inv1 += right_num.query(0, x, 0, 0, right_num.n); inv1 += left_num.query(x + 1, N, 0, 0, left_num.n); right_num.update(x, x + 1, 1, 0, 0, right_num.n); yaba.update(x + 1, N, 1, 0, 0, yaba.n); } void add_left(int idx) { int x = a[idx]; inv1 -= right_num.query(0, x, 0, 0, right_num.n); inv1 -= left_num.query(x + 1, N, 0, 0, left_num.n); left_num.update(x, x + 1, -1, 0, 0, left_num.n); yaba.update(0, x, -1, 0, 0, yaba.n); } void del_left(int idx) { int x = a[idx]; inv1 += right_num.query(0, x, 0, 0, right_num.n); inv1 += left_num.query(x + 1, N, 0, 0, left_num.n); left_num.update(x, x + 1, 1, 0, 0, left_num.n); yaba.update(0, x, 1, 0, 0, yaba.n); } }; int f(int a, int b) {return a + b;} int g(int a, int b) {return a + b;} int h(int a, int b, int l, int r) {return a + b * (r - l);} int f2(int a, int b) {return min(a, b);} int h2(int a, int b, int l, int r) {return a + b;} signed main() { fio(); int n, q; cin >> n >> q; a.resize(n); rep (i, n) { cin >> a[i]; a[i]--; } LazySegmentTree left_num(vi(N), f, g, h, 0, 0), right_num(vi(N), f, g, h, 0, 0); LazySegmentTree yaba(vi(N), f2, g, h2, inf, 0); ll ten = 0; rrep (i, n) { int x = a[i]; ten += right_num.query(0, x, 0, 0, right_num.n); right_num.update(x, x + 1, 1, 0, 0, right_num.n); } rep1 (i, N - 1) { int x = right_num.query(0, i, 0, 0, right_num.n); yaba.update(i, i + 1, x, 0, 0, right_num.n); } DEBUG(ten); Mo mo(n); mo.inv1 = ten; mo.left_num = left_num; mo.right_num = right_num; mo.yaba = yaba; vector lr; rep (i, q) { int l, r; cin >> l >> r; l--; mo.insert(l, r); lr.push_back(pii(l, r)); } mo.build(); vi ans(q); rep (i, q) { int idx = mo.process(); ans[idx] = mo.inv1 + mo.yaba.query(0, N, 0, 0, yaba.n) * (lr[idx].second - lr[idx].first); } rep (i, q) { cout << ans[i] << endl; } }