#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using ld = long double;
#define fi first
#define se second
#define vi vector<int>
#define vll vector<long long>
#define pii pair<int, int>
#define pll pair<long long, long long>
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int)(x).size()
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
mt19937_64 rng64(chrono::steady_clock::now().time_since_epoch().count());
inline int rand(int l,int r){return uniform_int_distribution<int>(l, r)(rng);}
inline ll rand(ll l,ll r){return uniform_int_distribution<ll>(l, r)(rng64);}
#ifdef DEBUG
auto&operator<<(auto&o,pair<auto,auto>p){return o<<"("<<p.first<<", "<<p.second<<")";}
auto operator<<(auto&o,auto x)->decltype(x.end(),o){o<<"{";int i=0;for(auto e:x)o<<","+!i++<<e;return o<<"}";}
#define debug(X...)cerr<<"["#X"]: ",[](auto...$){((cerr<<$<<"; "),...)<<endl;}(X)
#else
#define debug(...){}
#endif
struct custom_hash {
static uint64_t splitmix64(uint64_t x) {
x += 0x9e3779b97f4a7c15;
x = (x ^ (x >> 30)) * 0xbf58476d1ce4e5b9;
x = (x ^ (x >> 27)) * 0x94d049bb133111eb;
return x ^ (x >> 31);
}
size_t operator()(uint64_t x) const {
static const uint64_t FIXED_RANDOM = chrono::steady_clock::now().time_since_epoch().count();
return splitmix64(x + FIXED_RANDOM);
}
};
struct Query{
char type;
int x, y;
Query(char nt = 'C', int nx = 0, int ny = 0){
type = nt;
x = nx;
y = ny;
}
};
const int MAXN = 3e5 + 7;
const int INF = (int)1e9;
Query tab[MAXN];
vector<pii> g[MAXN];
int parent[MAXN];
int sz[MAXN];
int base[MAXN];
vi tree[MAXN];
pii id[MAXN];
int up[MAXN];
int jump[MAXN];
int dep[MAXN];
int n, k;
int query(int v, int l, int p, int a, int b, int d){
if(p < a || b < l){
return INF;
}
if(a <= l && p <= b){
return tree[d][v];
}
int mid = (l + p) / 2;
return min(query(2 * v, l, mid, a, b, d), query(2 * v + 1, mid + 1, p, a, b, d));
}
int l;
void dfs1(int v, int p, int d){
parent[v] = p;
dep[v] = d;
sz[v] = 1;
for(int i = 0; i < sz(g[v]); i++){
if(g[v][i].fi == p){
continue;
}
up[g[v][i].fi] = g[v][i].se;
dfs1(g[v][i].fi, v, d + 1);
sz[v] += sz[g[v][i].fi];
if(i > 0 && (g[v][0].fi == p || sz[g[v][0].fi] < sz[g[v][i].fi])){
swap(g[v][0], g[v][i]);
}
}
}
void buildTree(int s, int e){
l++;
vi path;
int akt = e;
while(akt != s){
path.pb(akt);
akt = parent[akt];
}
path.pb(s);
reverse(all(path));
base[l] = 1;
while(base[l] <= sz(path)){
base[l] *= 2;
}
for(int i = 0; i < sz(path); i++){
id[path[i]] = {l, i};
}
tree[l].assign(2 * base[l] + 5, INF);
for(int i = 0; i < sz(path); i++){
tree[l][i + base[l]] = up[path[i]];
}
for(int i = base[l] - 1; i >= 1; i--){
tree[l][i] = min(tree[l][2 * i], tree[l][2 * i + 1]);
}
}
void dfs2(int v, int s){
jump[v] = s;
if(sz(g[v]) == 1 && v != 1){
buildTree(s, v);
return;
}
dfs2(g[v][0].fi, s);
for(int i = 1; i < sz(g[v]); i++){
if(g[v][i].fi == parent[v]){
continue;
}
dfs2(g[v][i].fi, g[v][i].fi);
}
}
bool path(int col, int v){
//cerr << col << ' ' << v << '\n';
int mn = INF;
int aktX = col;
int aktY = v;
int lst = INF;
while(jump[aktX] != jump[aktY]){
if(dep[jump[aktX]] < dep[jump[aktY]]){
swap(aktX, aktY);
}
if(jump[aktX] != aktX){
mn = min(mn, query(1, 0, base[id[aktX].fi] - 1, 0, id[aktX].se, id[aktX].fi));
}
mn = min(mn, up[jump[aktX]]);
lst = up[jump[aktX]];
aktX = parent[jump[aktX]];
}
// cerr << aktX << ' ' << aktY << ' ' << mn << '\n';
if(dep[aktX] > dep[aktY]){
swap(aktX, aktY);
}
mn = min(mn, query(1, 0, base[id[aktX].fi] - 1, id[aktX].se, id[aktY].se, id[aktX].fi));
//cerr << mn << '\n';
if(col == aktX){
if(aktX == aktY){
//cerr << lst << '\n';
if(lst > mn){
return 0;
}
return 1;
}
//cerr << tree[id[aktX].fi][base[id[aktX].fi] + id[col].se + 1] << '\n';
if(tree[id[aktX].fi][base[id[aktX].fi] + id[col].se + 1] > mn){
return 0;
}
return 1;
}else{
if(up[col] > mn){
return 0;
}
return 1;
}
}
int main(){
ios_base::sync_with_stdio(0);
cin.tie(NULL);
cout.tie(NULL);
cin >> n >> k;
for(int i = 1; i < n + k; i++){
cin >> tab[i].type >> tab[i].x >> tab[i].y;
}
for(int i = 1; i < n + k; i++){
if(tab[i].type == 'S'){
g[tab[i].x].pb({tab[i].y, i});
g[tab[i].y].pb({tab[i].x, i});
}
}
up[1] = INF;
dfs1(1, 1, 0);
l = 0;
dfs2(1, 1);
for(int i = 1; i < n + k; i++){
if(tab[i].type != 'Q'){
continue;
}
if(tab[i].x == tab[i].y){
cout << "yes\n";
continue;
}
cout << (path(tab[i].y, tab[i].x) ? "yes\n" : "no\n");
}
return 0;
}
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
26 ms |
19280 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
26 ms |
19280 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
22 ms |
19416 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
22 ms |
19416 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
26 ms |
19300 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
26 ms |
19300 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
29 ms |
19288 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
29 ms |
19288 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
27 ms |
19284 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
27 ms |
19284 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
29 ms |
19224 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
29 ms |
19224 KB |
Output isn't correct |
| 2 |
Halted |
0 ms |
0 KB |
- |
