Submission #349814

#	Time	Username	Problem	Language	Result	Execution time	Memory
349814		doowey	Mousetrap (CEOI17_mousetrap)	C++14	0 / 100	892 ms	69228 KiB

mousetrap

#include <bits/stdc++.h>

using namespace std;

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

#define fi first
#define se second
#define mp make_pair
#define fastIO ios::sync_with_stdio(false);cin.tie(0);cout.tie(0);

const int N = (int)1e6 + 100;
vector<int> T[N];

int trap;
int mouse;

int dfs(int u, int par, int cum){
    vector<int> lis;
    int deg = 0;
    for(auto x : T[u]){
        if(x==par) continue;
        deg ++ ;
    }
    for(auto x : T[u]){
        if(x==par) continue;
        lis.push_back(dfs(x,u,cum+deg));
    }
    sort(lis.begin(), lis.end());
    if(lis.size() <= 1){
        return cum;
    }
    return lis[(int)lis.size() - 2];
}

int main(){
    fastIO;
    int n;
    cin >> n;
    cin >> trap >> mouse;
    int u, v;
    for(int i = 1; i < n; i ++ ){
        cin >> u >> v;
        T[u].push_back(v);
        T[v].push_back(u);
    }
    cout << dfs(mouse,trap,0);
    return 0;
}

• Subtask 1: 0 / 20
• Subtask 2: 0 / 25
• Subtask 3: 0 / 20
• Subtask 4: 0 / 35