mirror of
https://git.sb/baoshuo/OI-codes.git
synced 2024-12-12 03:26:27 +00:00
152 lines
3.0 KiB
C++
152 lines
3.0 KiB
C++
#include <iostream>
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#include <cmath>
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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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struct node {
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int l, r;
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int color, new_color;
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long long sum, sum_delta;
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node *lchild, *rchild;
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node()
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: l(0), r(0), color(-1), new_color(-1), sum(0), sum_delta(0), lchild(nullptr), rchild(nullptr) {}
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node(int _l, int _r)
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: l(_l), r(_r), color(-1), new_color(-1), sum(0), sum_delta(0), lchild(nullptr), rchild(nullptr) {}
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~node() {
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delete lchild;
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delete rchild;
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}
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void pushup() {
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sum = 0;
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color = -1;
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if (lchild != nullptr) {
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sum += lchild->sum;
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color = lchild->color;
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}
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if (rchild != nullptr) {
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sum += rchild->sum;
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color = color == rchild->color ? color : -1;
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}
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}
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void pushdown() {
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if (new_color == -1 || sum_delta == 0) return;
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if (lchild != nullptr) {
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if (sum_delta) {
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lchild->sum_delta += sum_delta;
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lchild->sum += sum_delta * (lchild->r - lchild->l + 1);
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}
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if (new_color != -1) {
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lchild->color = lchild->new_color = new_color;
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}
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}
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if (rchild != nullptr) {
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if (sum_delta) {
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rchild->sum_delta += sum_delta;
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rchild->sum += sum_delta * (rchild->r - rchild->l + 1);
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}
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if (new_color != -1) {
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rchild->color = rchild->new_color = new_color;
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}
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}
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new_color = -1;
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sum_delta = 0;
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}
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};
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void build(node *&u, int l, int r) {
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u = new node(l, r);
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if (l == r) {
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u->color = l;
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return;
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}
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int mid = (l + r) >> 1;
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if (l <= mid) build(u->lchild, l, mid);
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if (r > mid) build(u->rchild, mid + 1, r);
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u->pushup();
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}
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void modify(node *u, int l, int r, int new_color) {
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if (l <= u->l && u->r <= r && ~u->color) {
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u->sum += static_cast<long long>(std::abs(u->color - new_color)) * (u->r - u->l + 1);
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u->sum_delta += std::abs(u->color - new_color);
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u->color = u->new_color = new_color;
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return;
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}
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int mid = (u->l + u->r) >> 1;
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u->pushdown();
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if (l <= mid) modify(u->lchild, l, r, new_color);
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if (r > mid) modify(u->rchild, l, r, new_color);
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u->pushup();
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}
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long long query(node *u, int l, int r) {
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if (l <= u->l && u->r <= r) {
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return u->sum;
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}
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int mid = (u->l + u->r) >> 1;
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long long res = 0;
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u->pushdown();
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if (l <= mid) res += query(u->lchild, l, r);
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if (r > mid) res += query(u->rchild, l, r);
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return res;
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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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int n, m;
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node *root;
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cin >> n >> m;
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build(root, 1, n);
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while (m--) {
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int op, l, r;
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cin >> op >> l >> r;
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if (op == 1) {
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int x;
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cin >> x;
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modify(root, l, r, x);
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} else {
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cout << query(root, l, r) << endl;
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}
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}
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delete root;
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return 0;
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}
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