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QOJ
ID | 题目 | 提交者 | 结果 | 用时 | 内存 | 语言 | 文件大小 | 提交时间 | 测评时间 |
---|---|---|---|---|---|---|---|---|---|
#351536 | #6559. A Tree and Two Edges | janY | WA | 0ms | 3812kb | C++20 | 6.3kb | 2024-03-12 01:08:56 | 2024-03-12 01:08:58 |
Judging History
answer
#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx2,bmi,bmi2,popcnt,lzcnt")
#define fo(i,n) for(i=0;i<n;i++)
#define Fo(i,k,n) for(i=k;k<n?i<n:i>n;k<n?i+=1:i-=1)
#define ll long long
#define ld long double
#define ull unsigned long long
#define all(x) x.begin(), x.end()
#define sortall(x) sort(all(x))
#define rev(x) reverse(x.begin(), x.end())
#define fi first
#define se second
#define pb push_back
#define PI 3.14159265359
typedef pair<int, int> pii;
typedef pair<ll, ll> pl;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpii;
typedef vector<pl> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
bool sortbysec(const pair<int,int> &a,const pair<int,int> &b){return (a.second < b.second);}
#define sortpairbysec(x) sort(all(x), sortbysec)
bool sortcond(const pair<int,int> &a,const pair<int,int> &b){
if (a.fi != b.fi){
return a.fi < b.fi;
} else {
return a.se > b.se;
}
}
struct myComp {
constexpr bool operator()( pii const& a, pii const& b) const noexcept
{
if (a.first != b.first){
return a.first < b.first;
} else {
return a.second > b.second;
}
}
};
mt19937_64 rang(chrono::high_resolution_clock::now().time_since_epoch().count());
ll rng(ll lim) {
uniform_int_distribution<ll> uid(0,lim-1);
return uid(rang);
}
const int mod = 998244353;
const int N = 3e5, M = N;
const ll inf = 1e18;
//=======================
struct disjSet { // Disjoint set
int *rank, *parent, n;
disjSet() {}
disjSet(int n) {init(n);}
void init(int n){
rank = new int[n];
parent = new int[n];
this->n = n;
for (int i = 0; i < n; i++) {
rank[i] = 0;
parent[i] = i;
}
}
int find(int a) {
if (parent[a] != a){
//return find(parent[a]); // no path compression
parent[a] = find(parent[a]); // path compression
}
return parent[a];
}
bool Union(int a, int b) {
int a_set = find(a);
int b_set = find(b);
if (a_set == b_set) return false;
if (rank[a_set] < rank[b_set]) {
update_union(a_set, b_set);
} else if (rank[a_set] > rank[b_set]) {
update_union(b_set, a_set);
} else {
update_union(b_set, a_set);
rank[a_set] = rank[a_set] + 1;
}
return true;
}
// change merge behaviour here
void update_union(int a, int b){ // merge a into b
parent[a] = b;
}
};
//=======================
// & - bitwise AND; | - bitwise OR; ^ - bitwise XOR
// cout.precision(7);
// next_permutation(arr.begin(), arr.end());
// long long long long long long long long long long long long long long long long long long long long long long long long long long long
// priority_queue<int, vector<int>, greater<int>> a; (min heap)
// ll hash1 = hash<string>{}(to_string(1));
// always lower_bound
// __builtin_clz(n) count leading zeros
vl a;
ll n, m, k, q;
vector<vector<bool>> ans;
vpii xtra;
vvi g;
vector<pii> is_good;
vector<vpii> que;
vi blocked;
void fill_subtree(int loc, int p, int val, bool stop_block){
if (blocked[loc]) return;
is_good[loc] = {val, p};
for (auto &i : g[loc]){
if (i == p || (stop_block && blocked[i])) continue;
fill_subtree(i, loc, val, stop_block);
}
}
void walk(int loc, int p, int typ){
if (blocked[loc]) return;
blocked[loc] = 1;
pii rem = {-1, -1};
if (is_good[loc].fi == 1){
rem = is_good[loc];
for (auto &i : g[loc]){
if (i == p || i == rem.se) continue;
fill_subtree(i, loc, 0, 1);
}
is_good[loc] = {0, 0};
}
for (auto &i : que[loc]){
if (is_good[i.fi].fi == 1) ans[typ][i.se] = 1;
}
for (auto &i : g[loc]){
if (i == p) continue;
walk(i, loc, typ);
}
if (rem != (pii){-1, -1}){
is_good[loc] = rem;
for (auto &i : g[loc]){
if (i == p || i == rem.se) continue;
fill_subtree(i, loc, 1, 1);
}
}
blocked[loc] = 0;
}
bool block_path(int loc, int p, int targ){
if (loc == targ){
blocked[loc] = 1;
return 1;
}
for (auto &i : g[loc]){
if (i == p) continue;
if (block_path(i, loc, targ)){
blocked[loc] = 1;
return 1;
}
}
return 0;
}
void test(int typ){
blocked.assign(n, 0);
is_good.assign(n, {0, 0});
if (typ == 2){
block_path(xtra[0].se, xtra[0].se, xtra[1].fi);
blocked[xtra[0].fi] = 1;
fill_subtree(xtra[0].fi, xtra[0].fi, 1, 1);
walk(xtra[1].se, xtra[1].se, typ);
return;
}
pii the_edge;
if (typ == 0) the_edge = xtra[0];
if (typ == 1) the_edge = xtra[1];
blocked[the_edge.se] = 1;
fill_subtree(the_edge.se, the_edge.se, 1, 1);
walk(the_edge.fi, the_edge.fi, typ);
}
void solve(int tc) {
int i, j;
cin >> n >> q;
ans.resize(3, vector<bool>(q, 0));
disjSet dsu(n);
g.resize(n);
fo(i, n+1){
int u, v;
cin >> u >> v;
u--; v--;
if (dsu.Union(u, v)){
g[u].pb(v);
g[v].pb(u);
} else {
xtra.pb({u, v});
}
}
que.resize(n);
fo(i, q){
int u, v;
cin >> u >> v;
u--; v--;
que[u].pb({v, i});
}
test(0);
swap(xtra[0].fi, xtra[0].se);
test(0);
test(1);
swap(xtra[1].fi, xtra[1].se);
test(1);
test(2);
swap(xtra[0].fi, xtra[0].se);
test(2);
swap(xtra[1].fi, xtra[1].se);
test(2);
swap(xtra[0].fi, xtra[0].se);
test(2);
swap(xtra[0], xtra[1]);
test(2);
swap(xtra[0].fi, xtra[0].se);
test(2);
swap(xtra[1].fi, xtra[1].se);
test(2);
swap(xtra[0].fi, xtra[0].se);
test(2);
fo(i, q){
// cout << 1+ans[0][i]+ans[1][i]+ans[2][i] << "\n";
cout << ans[0][i] << " " << ans[1][i] << " " << ans[2][i] << "\n";
}
}
int main() {
ios_base::sync_with_stdio(0), cin.tie(0), cout.tie(0);
srand(chrono::high_resolution_clock::now().time_since_epoch().count());
int t = 1;
// cin >> t;
int i;
fo(i, t) {
solve(i+1);
}
return 0;
}
詳細信息
Test #1:
score: 0
Wrong Answer
time: 0ms
memory: 3812kb
input:
4 6 1 2 1 3 1 4 2 3 2 4 1 2 1 3 1 4 2 3 2 4 3 4
output:
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
result:
wrong answer 1st lines differ - expected: '3', found: '0 0 0'