Submission #1232759

#	Time	Username	Problem	Language	Result	Execution time	Memory
1232759		antonn	참나무 (IOI23_beechtree)	C++20	Compilation error	0 ms	0 KiB

beechtree

#include "beechtree.h"
#include <bits/stdc++.h>

using namespace std;

typedef long long ll;

const int N = 2e5 + 7;

int n, m;
vector<int> g[N];
int col[N], ok[N], par[N];
set<int> all;

void dfs(int u) {
    for (auto v : g[u]) {
        dfs(v);
    }
    if (g[u].size() == 0) {
        ok[u] = 1;
        return;
    }
    if (u != 0) {
        set<int> children;
        for (auto v : g[u]) children.insert(col[v]);
        if (children.size() == g[u].size()) ok[u] = 1;
    } else {
        set<int> children;
        for (auto v : g[u]) children.insert(col[v]);
        if (children.size() != g[u].size()) ok[u] = 0;
        for (auto v : g[u]) if (ok[v] == 0) ok[u] = 0;
        if (children.size() != all.size()) ok[u] = 0;
        
        int cnt = 0;
        for (auto v : g[u]) if (g[v].size() > 0) ++cnt;
        if (cnt > 1) ok[v] = 0;
    }
}

vector<int> beechtree(int N, int M, vector<int> P, vector<int> C) {
    n = N;
    m = M;
    for (int i = 0; i < n; ++i) {
        par[i] = P[i];
        if (i > 0) {
            g[P[i]].push_back(i);
        }
    }
    ok[0] = 1;
    map<int, int> f;
    for (int i = 0; i < n; ++i) {
        col[i] = C[i];
    }
    for (int i = 1; i < n; ++i) {
        f[col[i]]++;
        all.insert(col[i]);
    }
    int cnt = 0;
    for (auto x : f) {
        if (x.second > 2) {
            ok[0] = 0;
        } 
    } 
    dfs(0);
    vector<int> ret(n);
    for (int i = 0; i < n; ++i) ret[i] = ok[i];
    return ret; 
}

Compilation message (stderr)

beechtree.cpp: In function 'void dfs(int)':
beechtree.cpp:36:25: error: 'v' was not declared in this scope
   36 |         if (cnt > 1) ok[v] = 0;
      |                         ^