Submission #532175

#	Time	Username	Problem	Language	Result	Execution time	Memory
532175		syl123456	Unique Cities (JOI19_ho_t5)	C++17	100 / 100	314 ms	35168 KiB

joi2019_ho_t5

#include <bits/stdc++.h>
#define all(i) (i).begin(), (i).end()
using namespace std;
template<typename T1>
void Debug(bool _split, T1 i) {
    if (_split)
        cerr << ", ";
    cerr << i;
}
template<typename T1, typename ...T2>
void Debug(bool _split, T1 i, T2 ...j) {
    if (_split)
        cerr << ", ";
    cerr << i;
    Debug(true, j...);
}
#define debug(args...) cout << "Line" << __LINE__ << " : [" << #args << "] is [", Debug(false, args), cerr << "]" << endl;
 
typedef pair<int, int> pi;
typedef long long ll;
 
const int inf = 0x3f3f3f3f, lg = 20;
const ll mod = 1e9 + 7, INF = 0x3f3f3f3f;

const int N = 2e5;
 
vector<int> g[N];
int pa[N], c[N], at[N], cnt[N], ans[N];
pair<pi, pi> mx[N];
vector<pi> vv;

int now;

pi dfs1(int i, int p) {
    pa[i] = p;
    pi res(0, i);
    for (int j : g[i])
        if (j != p) {
            pi tmp = dfs1(j, i);
            ++tmp.first;
            res = max(res, tmp);
        }
    return res;
}
 
int dfs2(int i, int p, int _v) {
    mx[i].first = mx[i].second = pi(0, i);
    for (int j : g[i])
        if (j != p) {
            pi tmp(dfs2(j, i, _v - 1) + 1, j);
            if (tmp.first > mx[i].first.first)
                mx[i].second = mx[i].first, mx[i].first = tmp;
            else if (tmp.first > mx[i].second.first)
                mx[i].second = tmp;
        }
    return mx[i].first.first;
}
 
void dfs3(int i, int p, int _v) {
    if (at[_v] == -2)
        at[_v] = c[i];
    else
        at[_v] = -1;
    for (int j : g[i])
        if (j != p)
            dfs3(j, i, _v + 1);
}

void add(int x, int y) {
    vv.emplace_back(x, y);
    if (!cnt[y])
        ++now;
    ++cnt[y];
}

void del(int x = inf, int y = -1) {
    if (~y && (vv.empty() || vv.back() != pi(x, y)))
        return;
    y = vv.back().second;
    vv.pop_back();
    --cnt[y];
    if (!cnt[y])
        --now;
}
 
void dfs4(int i, int p, int _v) {
    int tmp;

    if (mx[i].first.second != i) {
        if (mx[i].second.first > 0)
            tmp = _v + mx[i].second.first;
        else
            tmp = _v;
        
        while (vv.back().first <= tmp)
            del();

        add(_v, c[i]);
        
        dfs4(mx[i].first.second, i, _v - 1);
    }

    if (mx[i].first.first > 0)
        tmp = _v + mx[i].first.first;
    else
        tmp = _v;

    while (vv.back().first <= tmp)
        del();

    ans[i] = now;

    for (int j : g[i])
        if (j != p && j != mx[i].first.second) {
            while (vv.back().first <= tmp)
                del();
            add(_v, c[i]);
            dfs4(j, i, _v - 1);
        }
}
 
signed main() {
    ios::sync_with_stdio(0), cin.tie(0);
    int n, _;
    cin >> n >> _;
    for (int i = 0; i < n - 1; ++i) {
        int x, y;
        cin >> x >> y;
        --x, --y;
        g[x].push_back(y), g[y].push_back(x);
    }
    for (int i = 0; i < n; ++i)
        cin >> c[i], --c[i];
    int x = dfs1(0, -1).second;
    int y = dfs1(x, -1).second;
    vector<int> dm;
    for (int i = y; ~i; i = pa[i])
        dm.push_back(i);

    x = dm.size() - 1 >> 1;//2k -> k-1, 2k+1 -> k
    dfs2(dm[x], dm[x + 1], 0);
    fill(at, at + n, -2);
    dfs3(dm[x + 1], dm[x], 1);
    fill(cnt, cnt + n, 0);
    now = 0;
    vv.emplace_back(inf, -1);
    for (int i = n - 1; i; --i)
        if (at[i] >= 0) {
            add(i, at[i]);
        }
    dfs4(dm[x], dm[x + 1], 0);
 
    x = dm.size() >> 1;//2k -> k, 2k+1 -> k
    dfs2(dm[x], dm[x - 1], 0);
    fill(at, at + n, -2);
    dfs3(dm[x - 1], dm[x], 1);
    fill(cnt, cnt + n, 0);
    now = 0;
    vv.clear();
    vv.emplace_back(inf, -1);
    for (int i = n - 1; i; --i)
        if (at[i] >= 0) {
            add(i, at[i]);
        }
    dfs4(dm[x], dm[x - 1], 0);
 
    for (int i = 0; i < n; ++i)
        cout << ans[i] << '\n';
}

Compilation message (stderr)

joi2019_ho_t5.cpp: In function 'int main()':
joi2019_ho_t5.cpp:140:19: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
  140 |     x = dm.size() - 1 >> 1;//2k -> k-1, 2k+1 -> k
      |         ~~~~~~~~~~^~~

• Subtask 1: 4 / 4
• Subtask 2: 32 / 32
• Subtask 3: 32 / 32
• Subtask 4: 32 / 32