Submission #1105209

#	Time	Username	Problem	Language	Result	Execution time	Memory
1105209		jadai007	Tropical Garden (IOI11_garden)	C++17	49 / 100	5071 ms	7504 KiB

garden

#include "garden.h"
#include "gardenlib.h"
#include <bits/stdc++.h>

using namespace std;

int ans = 0;
vector<pair<int, int>> vc[200200];

void dfs(int u, int k, int P, int par){
    if(k == 0){
        if(u == P) ans++;
        return;
    }
    if(vc[u].size() == 1) dfs(vc[u][0].second, k - 1, P, u);
    else{
        for(auto x:vc[u]){
            int w = x.first, v = x.second;
            if(v == par) continue;
            dfs(v, k - 1, P, u);
            break;
        }
    }
}

void count_routes(int N, int M, int P, int R[][2], int Q, int G[]){
    for(int i = 0; i < M; ++i) vc[R[i][0]].emplace_back(i, R[i][1]), vc[R[i][1]].emplace_back(i, R[i][0]);
    for(int i = 0; i < N; ++i) sort(vc[i].begin(), vc[i].end());
    for(int i = 0; i < N; ++i) dfs(i, G[0], P, -1);
    answer(ans);
}

Compilation message (stderr)

garden.cpp: In function 'void dfs(int, int, int, int)':
garden.cpp:18:17: warning: unused variable 'w' [-Wunused-variable]
   18 |             int w = x.first, v = x.second;
      |                 ^

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