Submission #763435

#	Time	Username	Problem	Language	Result	Execution time	Memory
763435		boris_mihov	Tropical Garden (IOI11_garden)	C++17	49 / 100	5075 ms	5332 KiB

garden

#include "garden.h"
#include "gardenlib.h"
#include <algorithm>
#include <iostream>
#include <numeric>
#include <cstring>
#include <cassert>
#include <vector>
 
typedef long long llong;
const int MAXN = 150000 + 10;
const int INF  = 1e9;
 
int n, m, p, q;
int dp[MAXN][2];
int cnt[MAXN][2];
std::vector <std::pair <int,int>> g[MAXN];
bool vis[MAXN][2];
 
void dfs(int node, bool next, int edges, bool firstEdge)
{
    if (next == false)
    {
        cnt[edges][firstEdge]++;
    }
 
    vis[node][next] = true;
    int l = 0, r = g[node].size();
    if (next || g[node].size() == 1)
    {
        r = 1;
    } else
    {
        l = 1;
    }
 
    for (int i = l ; i < r ; ++i)
    {
        auto [u, t] = g[node][i];
        if (t == g[u][0].second && !vis[u][0])
        {
            dfs(u, 0, edges + 1, firstEdge);
            continue;
        }
 
        if (t == g[u][1].second && !vis[u][1])
        {
            dfs(u, 1, edges + 1, firstEdge);
            continue;
        }
    }
}

int g1;
std::pair <int,int> dfsCycle(int node, bool fromMAX, int time)
{
    if (time == g1)
    {
        return {(node == p), 1};
    }
 
    vis[node][fromMAX] = true;
    if (!fromMAX || g[node].size() == 1)
    {
        return dfsCycle(g[node][0].first, (g[node][0].second == g[g[node][0].first][0].second), time + 1);
    } else
    {
        return dfsCycle(g[node][1].first, (g[node][1].second == g[g[node][1].first][0].second), time + 1);
    }
}
 
void count_routes(int N, int M, int P, int R[][2], int Q, int G[])
{
    n = N;
    m = M;
    p = P + 1;
    q = Q;
 
    for (int i = 0 ; i < m ; ++i)
    {
        g[R[i][0] + 1].push_back({R[i][1] + 1, i + 1});
        g[R[i][1] + 1].push_back({R[i][0] + 1, i + 1});
    }
 
    for (int i = 1 ; i <= n ; ++i)
    {
        std::sort(g[i].begin(), g[i].end(), [&](auto a, auto b)
        {
            return a.second < b.second;
        });
    }
 
    vis[p][0] = vis[p][1] = true;
    for (const auto &[u, t] : g[p])
    {
        if (t == g[u][0].second)
        {
            dfs(u, 0, 1, (t == g[p][0].second));
            continue;
        } 
 
        if (t == g[u][1].second)
        {
            dfs(u, 1, 1, (t == g[p][0].second));
            continue;
        }
    }
    
    std::pair <int,int> cycle[2];
    memset(vis, false, sizeof(vis));
    cycle[0] = dfsCycle(p, 0, 0);
 
    memset(vis, false, sizeof(vis));
    cycle[1] = dfsCycle(p, 1, 0);
 
    for (int i = 1 ; i <= 100 ; ++i)
    {
        for (int j = 0 ; j < 2 ; ++j)
        {
            dp[i][j] += cnt[i][j];
            if (cycle[j].first != -1)
            {
                dp[i + cycle[j].first][cycle[j].second] += dp[i][j];
            }
        }
    }
 
    for (int i = 0 ; i < q ; ++i)
    {
        g1 = G[i];
        int ans = 0;
        for (int j = 1 ; j <= n ; ++j)
        {
            for (int k = 1 ; k <= n ; ++k)
            {
                vis[k][0] = vis[k][1] = false;
            }

            std::pair <int,int> res = dfsCycle(j, 0, 0);
            if (res.first == 1) ans++;
        }

        answer(ans);
    }
}

• Subtask 1: 49 / 49
• Subtask 2: 0 / 20
• Subtask 3: 0 / 31