Submission #841671

#	Time	Username	Problem	Language	Result	Execution time	Memory
841671		Batrr	Beech Tree (IOI23_beechtree)	C++17	22 / 100	279 ms	105044 KiB

beechtree

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

#define f first
#define s second
#define pb push_back
#define mp make_pair

using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<long long, long long> pll;

const int N = 300500, inf = 1e9, mod = 998244353;
const ll INF = 1e18;

vector<pii> g[N];
int n, m;
int ans[N];
int P[N], C[N];
int tin[N], timer;

vector<int> t[N];

int sz[N];

map<int, int> was[N], dp[N];

bool f(int v, int u) {
    if (was[v][u])
        return dp[v][u];
    was[v][u] = 1;
    for (int i = 0, j = 0; i < g[u].size(); i++) {
        while (j < g[v].size() && g[v][j].f != g[u][i].f)
            j++;
        if (j == g[v].size())
            return dp[v][u] = false;
        if (!f(g[v][j].s, g[u][i].s))
            return dp[v][u] = false;
    }
    return dp[v][u] = true;
}

void dfs(int v) {
    tin[v] = timer++;
    sz[v] = 1;
    ans[v] = 1;
    vector<int> a;
    for (int i = 0; i + 1 < g[v].size(); i++)
        ans[v] &= (g[v][i].f != g[v][i + 1].f);
    for (auto it: g[v]) {
        int to = it.s;
        a.pb(to);
        dfs(to);
        sz[v] += sz[to];
        ans[v] &= ans[to];
        ans[v] &= f(v, to);
    }
    sort(a.begin(), a.end(), [](int i, int j) {
        return sz[i] > sz[j];
    });
    for (int i = 0; i + 1 < a.size(); i++)
        ans[v] &= f(a[i], a[i + 1]);

}

vector<int> beechtree(int N, int M, vector<int> PP, vector<int> CC) {

    n = N;
    for (int i = 0; i < n; i++) {
        g[i].clear();
        P[i] = PP[i];
        C[i] = CC[i];
        ans[i] = 0;
        was[i].clear();
        dp[i].clear();
    }
    for (int i = 1; i < n; i++)
        g[P[i]].pb({C[i], i});
    for (int i = 0; i < n; i++)
        sort(g[i].begin(), g[i].end());

    dfs(0);


    return vector<int>(ans, ans + n);
}

Compilation message (stderr)

beechtree.cpp: In function 'bool first(int, int)':
beechtree.cpp:34:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for (int i = 0, j = 0; i < g[u].size(); i++) {
      |                            ~~^~~~~~~~~~~~~
beechtree.cpp:35:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   35 |         while (j < g[v].size() && g[v][j].f != g[u][i].f)
      |                ~~^~~~~~~~~~~~~
beechtree.cpp:37:15: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |         if (j == g[v].size())
      |             ~~^~~~~~~~~~~~~~
beechtree.cpp:38:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   38 |             return dp[v][u] = false;
beechtree.cpp:40:29: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   40 |             return dp[v][u] = false;
beechtree.cpp:42:21: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
   42 |     return dp[v][u] = true;
beechtree.cpp: In function 'void dfs(int)':
beechtree.cpp:50:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   50 |     for (int i = 0; i + 1 < g[v].size(); i++)
      |                     ~~~~~~^~~~~~~~~~~~~
beechtree.cpp:63:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   63 |     for (int i = 0; i + 1 < a.size(); i++)
      |                     ~~~~~~^~~~~~~~~~

• Subtask 0: 0 / 0
• Subtask 1: 0 / 9
• Subtask 2: 5 / 5
• Subtask 3: 9 / 9
• Subtask 4: 8 / 8
• Subtask 5: 0 / 14
• Subtask 6: 0 / 14
• Subtask 7: 0 / 12
• Subtask 8: 0 / 17
• Subtask 9: 0 / 12