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cp-templates/trees/segtree_generic.cc

125 lines
3.3 KiB
C++

template<typename Addable_Info_t, typename Tag_t, typename Sequence = std::vector<Addable_Info_t>> class segtree {
private:
using size_type = uint64_t;
using info_type = Addable_Info_t;
using tag_type = Tag_t;
size_type _max;
vector<info_type> d;
vector<tag_type> b;
void pull(size_type p) {
d[p] = d[p * 2] + d[p * 2 + 1];
}
void push(size_type p, size_type left_len, size_type right_len) {
d[p * 2].apply(b[p], left_len), d[p * 2 + 1].apply(b[p], right_len);
b[p * 2].apply(b[p]), b[p * 2 + 1].apply(b[p]);
b[p] = tag_type();
}
void set(size_type s, size_type t, size_type p, size_type x, const info_type& c) {
if (s == t) {
d[p] = c;
return;
}
size_type m = s + (t - s >> 1);
if (s != t) push(p, m - s + 1, t - m);
if (x <= m) set(s, m, p * 2, x, c);
else set(m + 1, t, p * 2 + 1, x, c);
pull(p);
}
void range_apply(size_type s, size_type t, size_type p, size_type l, size_type r, const tag_type& c) {
if (l <= s && t <= r) {
d[p].apply(c, t - s + 1);
b[p].apply(c);
return;
}
size_type m = s + (t - s >> 1);
push(p, m - s + 1, t - m);
if (l <= m) range_apply(s, m, p * 2, l, r, c);
if (r > m) range_apply(m + 1, t, p * 2 + 1, l, r, c);
pull(p);
}
info_type range_query(size_type s, size_type t, size_type p, size_type l, size_type r) {
if (l <= s && t <= r) {
return d[p];
}
size_type m = s + (t - s >> 1);
info_type res = {};
push(p, m - s + 1, t - m);
if (l <= m) res = res + range_query(s, m, p * 2, l, r);
if (r > m) res = res + range_query(m + 1, t, p * 2 + 1, l, r);
return res;
}
void build(const Sequence& a, size_type s, size_type t, size_type p) {
if (s == t) {
d[p] = a[s];
return;
}
int m = s + (t - s >> 1);
build(a, s, m, p * 2);
build(a, m + 1, t, p * 2 + 1);
pull(p);
}
public:
segtree(size_type __max) : d(4 * __max), b(4 * __max), _max(__max - 1) {}
segtree(const Sequence& a) : segtree(a.size()) {
build(a, {}, _max, 1);
}
void set(size_type i, const info_type& c) {
set({}, _max, 1, i, c);
}
void range_apply(size_type l, size_type r, const tag_type& c) {
range_apply({}, _max, 1, l, r, c);
}
void apply(size_type i, const tag_type& c) {
range_apply(i, i, c);
}
info_type range_query(size_type l, size_type r) {
return range_query({}, _max, 1, l, r);
}
info_type query(size_type i) {
return range_query(i, i);
}
Sequence serialize() {
Sequence res = {};
for (size_type i = 0; i <= _max; ++i) {
res.push_back(query(i));
}
return res;
}
const vector<info_type>& get_d() {
return d;
}
};
struct Tag {
ll val = -1;
void apply(const Tag& rhs) {
if (rhs.val != -1)
val = rhs.val;
}
};
struct Info {
ll val = 0;
void apply(const Tag& rhs, size_t len) {
if (rhs.val != -1)
val = rhs.val * len;
}
};
Info operator+(const Info &a, const Info &b) {
return {a.val + b.val};
}