oj.uz

Submission #532122

# Submission time Handle Problem Language Result Execution time Memory
532122 2022-03-02T06:19:51 Z syl123456 Unique Cities (JOI19_ho_t5) C++17
0 / 100
 711 ms 274436 KB 
#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;

vector<vector<int>> g;
vector<int> pa, c, at, cnt, ans;
vector<pair<pi, pi>> mx;
deque<pi> dq;

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 dfs4(int i, int p, int _v) {
    int tmp;
    if (mx[i].first.first > 0)
        tmp = _v + mx[i].first.first;
    else
        tmp = _v;

    vector<pi> stk;
    while (dq.front().first <= tmp)
        stk.push_back(dq.front()), dq.pop_front();
        
    int now = ans[i] = dq.front().second;

    if (!cnt[c[i]])
        ++now, dq.emplace_front(_v, now);
    ++cnt[c[i]];
    for (int j : g[i])
        if (j != p && j != mx[i].first.second)
            dfs4(j, i, _v - 1);


    --cnt[c[i]];
    if (!cnt[c[i]])
        --now, dq.pop_front();

    if (mx[i].first.second != i) {
        if (mx[i].second.first > 0)
            tmp = _v + mx[i].second.first;
        else
            tmp = _v;
        
        while (!stk.empty() && stk.back().first > tmp)
            dq.push_front(stk.back()), stk.pop_back();
        
        now = dq.front().second;

        if (!cnt[c[i]])
            ++now, dq.emplace_front(_v, now);
        ++cnt[c[i]];
        
        dfs4(mx[i].first.second, i, _v - 1);

        --cnt[c[i]];
        if (!cnt[c[i]])
            --now, dq.pop_front();
    }

    while (!stk.empty())
        dq.push_front(stk.back()), stk.pop_back();
}

signed main() {
    ios::sync_with_stdio(0), cin.tie(0);
    int n, _;
    cin >> n >> _;
    g.resize(n);
    pa.resize(n);
    at.resize(n);
    mx.resize(n);
    ans.resize(n, -1);
    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);
    }
    c.resize(n);
    for (int &i : c)
        cin >> i, --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);
    at.assign(n, -2);
    dfs3(dm[x + 1], dm[x], 1);
    cnt.assign(n, 0);
    int now = 0;
    dq.emplace_back(inf, 0);
    for (int i = n - 1; i; --i)
        if (at[i] >= 0) {
            if (!cnt[at[i]])
                ++now;
            ++cnt[at[i]];
            dq.emplace_front(i, now);
        }
    dfs4(dm[x], dm[x + 1], 0);

    x = dm.size() >> 1;//2k -> k, 2k+1 -> k
    dfs2(dm[x], dm[x - 1], 0);
    at.assign(n, -2);
    dfs3(dm[x - 1], dm[x], 1);
    cnt.assign(n, 0);
    now = 0;
    dq.clear();
    dq.emplace_back(inf, 0);
    for (int i = n - 1; i; --i)
        if (at[i] >= 0) {
            if (!cnt[at[i]])
                ++now;
            ++cnt[at[i]];
            dq.emplace_front(i, now);
        }
    dfs4(dm[x], dm[x - 1], 0);

    for (int i : ans)
        cout << i << '\n';
}

Compilation message

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
0 / 4.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Incorrect 3 ms 460 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 32.0

# Verdict Execution time Memory Grader output
1 Incorrect 109 ms 11084 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 220 ms 15024 KB Output is correct
2 Runtime error 711 ms 274436 KB Execution killed with signal 9
3 Halted 0 ms 0 KB -

Subtask #4
0 / 32.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 204 KB Output is correct
2 Incorrect 3 ms 460 KB Output isn't correct
3 Halted 0 ms 0 KB -