Submission #330516

#	Time	Username	Problem	Language	Result	Execution time	Memory
330516		BeanZ	Cats or Dogs (JOI18_catdog)	C++14	38 / 100	3098 ms	7256 KiB

catdog

// I_Love_LPL
#include <bits/stdc++.h>
using namespace std;
#define ll int
#define endl '\n'
const int N = 1e5 + 5;
const int lg = 60;
const int mod = 998244353;
const long long oo = 1e18;
const int lim = 1e6 + 5;
long double eps = 1e-3;
vector<ll> node[N];
ll dpc[N], dpd[N], color[N];
void initialize(ll n, vector<ll> A, vector<ll> B){
    for (int i = 1; i < n; i++){
        node[A[i - 1]].push_back(B[i - 1]);
        node[B[i - 1]].push_back(A[i - 1]);
    }
}
void dfs(ll u, ll p){
    dpc[u] = 0;
    dpd[u] = 0;
    if (color[u] == 1) dpd[u] = 1e9;
    if (color[u] == 2) dpc[u] = 1e9;
    for (auto j : node[u]){
        if (j == p) continue;
        dfs(j, u);
        if (color[u] == 1) dpc[u] += min(dpc[j], dpd[j] + 1);
        else if (color[u] == 2) dpd[u] += min(dpd[j], dpc[j] + 1);
        else dpc[u] += min(dpc[j], dpd[j] + 1), dpd[u] += min(dpd[j], dpc[j] + 1);
    }
}
ll Solve(){
    dfs(1, 1);
    return min(dpc[1], dpd[1]);
}
ll cat(ll v){
    color[v] = 1;
    return Solve();
}
ll dog(ll v){
    color[v] = 2;
    return Solve();
}
ll neighbor(ll v){
    color[v] = 0;
    return Solve();
}
/*
int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    if (fopen("A.inp", "r")){
        freopen("test.inp", "r", stdin);
        freopen("test.out", "w", stdout);
    }
    ll n;
    cin >> n;
    vector<ll> A, B;
    for (int i = 1; i < n; i++){
        ll u, v;
        cin >> u >> v;
        A.push_back(u);
        B.push_back(v);
    }
    initialize(n, A, B);
    ll q;
    cin >> q;
    while (q--){
        ll task;
        cin >> task;
        if (task == 0){
            ll u;
            cin >> u;
            cout << neighbor(u) << endl;
        } else if (task == 1){
            ll u;
            cin >> u;
            cout << cat(u) << endl;
        } else {
            ll u;
            cin >> u;
            cout << dog(u) << endl;
        }
    }
}
/*
5
1 2
2 3
2 4
4 5
5
1 3
2 5
1 2
2 1
0 2
*/

Compilation message (stderr)

catdog.cpp:87:1: warning: "/*" within comment [-Wcomment]
   87 | /*
      |

• Subtask 1: 8 / 8
• Subtask 2: 30 / 30
• Subtask 3: 0 / 62