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1180. [Croatian2009] OTOCI

https://hydro.ac/d/bzoj/record/63b240eb246ae133e6cb84e9
This commit is contained in:
Baoshuo Ren 2023-01-02 10:27:06 +08:00
parent dcaf8c59f2
commit 9a5d30c834
Signed by: baoshuo
GPG Key ID: 00CB9680AB29F51A
21 changed files with 274 additions and 0 deletions

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#include <iostream>
#include <stack>
#include <string>
using std::cin;
using std::cout;
const char endl = '\n';
const int N = 3e4 + 5;
class LinkCutTree {
private:
struct node {
size_t l, r, f;
unsigned v, s;
bool rev;
node()
: l(0), r(0), f(0), s(0), v(0), rev(false) {}
node(unsigned _v, size_t _f)
: l(0), r(0), f(_f), s(_v), v(_v), rev(false) {}
size_t &child(unsigned x) {
return !x ? l : r;
}
} tr[N];
inline void pushup(size_t u) {
tr[u].s = tr[tr[u].l].s + tr[u].v + tr[tr[u].r].s;
}
inline void pushdown(const size_t &u) {
if (!tr[u].rev) return;
std::swap(tr[u].l, tr[u].r);
tr[tr[u].l].rev = !tr[tr[u].l].rev;
tr[tr[u].r].rev = !tr[tr[u].r].rev;
tr[u].rev = false;
}
unsigned relation(const size_t &u) {
return u == tr[tr[u].f].l ? 0 : 1;
}
bool isRoot(const size_t &u) {
return tr[tr[u].f].l != u && tr[tr[u].f].r != u;
}
void rotate(size_t u) {
size_t p = tr[u].f;
unsigned x = relation(u);
if (!isRoot(p)) {
tr[tr[p].f].child(relation(p)) = u;
}
tr[u].f = tr[p].f;
if (tr[u].child(x ^ 1)) {
tr[tr[u].child(x ^ 1)].f = p;
}
tr[p].child(x) = tr[u].child(x ^ 1);
tr[u].child(x ^ 1) = p;
tr[p].f = u;
pushup(p);
pushup(u);
}
void splay(size_t u) {
std::stack<size_t> st;
size_t cur = u;
st.push(cur);
while (!isRoot(cur)) {
st.push(tr[cur].f);
cur = tr[cur].f;
}
while (!st.empty()) {
pushdown(st.top());
st.pop();
}
while (!isRoot(u)) {
if (isRoot(tr[u].f)) {
rotate(u);
} else if (relation(u) == relation(tr[u].f)) {
rotate(tr[u].f);
rotate(u);
} else {
rotate(u);
rotate(u);
}
}
}
void access(size_t u) {
for (size_t f = 0; u; u = tr[f = u].f) {
splay(u);
tr[u].r = f;
pushup(u);
}
}
void makeRoot(const size_t &u) {
access(u);
splay(u);
tr[u].rev = !tr[u].rev;
}
size_t findRoot(size_t u) {
access(u);
splay(u);
while (tr[u].l) {
u = tr[u].l;
}
return u;
}
void split(const size_t &x, const size_t &y) {
makeRoot(x);
access(y);
splay(y);
}
public:
void set(int p, int v) {
tr[p].s = tr[p].v = v;
}
unsigned query(int x, int y) {
split(x, y);
return tr[y].s;
}
bool check(int x, int y) {
return findRoot(x) == findRoot(y);
}
void link(const int &x, const int &y) {
makeRoot(x);
if (findRoot(y) != x) {
tr[x].f = y;
}
}
void cut(int x, int y) {
split(x, y);
if (tr[y].l == x) {
tr[y].l = 0;
tr[x].f = 0;
}
}
void change(int p, int v) {
access(p);
splay(p);
tr[p].v = v;
pushup(p);
}
} lct;
int main() {
std::ios::sync_with_stdio(false);
cin.tie(nullptr);
int n;
cin >> n;
for (int i = 1, x; i <= n; i++) {
cin >> x;
lct.set(i, x);
}
int q;
cin >> q;
while (q--) {
std::string op;
int x, y;
cin >> op >> x >> y;
if (op == "bridge") {
if (lct.check(x, y)) {
cout << "no" << endl;
} else {
lct.link(x, y);
cout << "yes" << endl;
}
} else if (op == "penguins") {
lct.change(x, y);
} else { // op == "excursion"
if (lct.check(x, y)) {
cout << lct.query(x, y) << endl;
} else {
cout << "impossible" << endl;
}
}
}
return 0;
}

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