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OI-codes/Luogu/CF444C/CF444C.cpp

152 lines
3.0 KiB
C++

#include <iostream>
#include <cmath>
using std::cin;
using std::cout;
const char endl = '\n';
struct node {
int l, r;
int color, new_color;
long long sum, sum_delta;
node *lchild, *rchild;
node()
: l(0), r(0), color(-1), new_color(-1), sum(0), sum_delta(0), lchild(nullptr), rchild(nullptr) {}
node(int _l, int _r)
: l(_l), r(_r), color(-1), new_color(-1), sum(0), sum_delta(0), lchild(nullptr), rchild(nullptr) {}
~node() {
delete lchild;
delete rchild;
}
void pushup() {
sum = 0;
color = -1;
if (lchild != nullptr) {
sum += lchild->sum;
color = lchild->color;
}
if (rchild != nullptr) {
sum += rchild->sum;
color = color == rchild->color ? color : -1;
}
}
void pushdown() {
if (new_color == -1 || sum_delta == 0) return;
if (lchild != nullptr) {
if (sum_delta) {
lchild->sum_delta += sum_delta;
lchild->sum += sum_delta * (lchild->r - lchild->l + 1);
}
if (new_color != -1) {
lchild->color = lchild->new_color = new_color;
}
}
if (rchild != nullptr) {
if (sum_delta) {
rchild->sum_delta += sum_delta;
rchild->sum += sum_delta * (rchild->r - rchild->l + 1);
}
if (new_color != -1) {
rchild->color = rchild->new_color = new_color;
}
}
new_color = -1;
sum_delta = 0;
}
};
void build(node *&u, int l, int r) {
u = new node(l, r);
if (l == r) {
u->color = l;
return;
}
int mid = (l + r) >> 1;
if (l <= mid) build(u->lchild, l, mid);
if (r > mid) build(u->rchild, mid + 1, r);
u->pushup();
}
void modify(node *u, int l, int r, int new_color) {
if (l <= u->l && u->r <= r && ~u->color) {
u->sum += static_cast<long long>(std::abs(u->color - new_color)) * (u->r - u->l + 1);
u->sum_delta += std::abs(u->color - new_color);
u->color = u->new_color = new_color;
return;
}
int mid = (u->l + u->r) >> 1;
u->pushdown();
if (l <= mid) modify(u->lchild, l, r, new_color);
if (r > mid) modify(u->rchild, l, r, new_color);
u->pushup();
}
long long query(node *u, int l, int r) {
if (l <= u->l && u->r <= r) {
return u->sum;
}
int mid = (u->l + u->r) >> 1;
long long res = 0;
u->pushdown();
if (l <= mid) res += query(u->lchild, l, r);
if (r > mid) res += query(u->rchild, l, r);
return res;
}
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
int n, m;
node *root;
cin >> n >> m;
build(root, 1, n);
while (m--) {
int op, l, r;
cin >> op >> l >> r;
if (op == 1) {
int x;
cin >> x;
modify(root, l, r, x);
} else {
cout << query(root, l, r) << endl;
}
}
delete root;
return 0;
}