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답안 #948694

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
948694 2024-03-18T11:20:45 Z GrindMachine Mousetrap (CEOI17_mousetrap) C++17
45 / 100
 849 ms 60292 KB 
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e6 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

vector<int> adj[N];
vector<int> dp(N);

void dfs1(int u, int p){
    int deg = sz(adj[u])-(p != -1);
    dp[u] = deg;
    vector<int> vals;
    vals.pb(0), vals.pb(0);

    trav(v,adj[u]){
        if(v == p) conts;
        dfs1(v,u);
        vals.pb(dp[v]);
    }

    sort(rall(vals));
    dp[u] += vals[1];
}

vector<int> curr_path;
vector<int> path;

void dfs2(int u, int p, int des){
    curr_path.pb(u);
    if(u == des){
        path = curr_path;
    }

    trav(v,adj[u]){
        if(v == p) conts;
        dfs2(v,u,des);
    }

    curr_path.pop_back();
}

void solve(int test_case)
{
    int n,t,m; cin >> n >> t >> m;
    rep1(i,n-1){
        int u,v; cin >> u >> v;
        adj[u].pb(v), adj[v].pb(u);
    }

    dfs1(m,-1);
    dfs2(m,-1,t);
    path.pop_back();

    vector<bool> on_path(n+5);
    trav(u,path) on_path[u] = 1;
    int ans = 0;

    rep(i,sz(path)){
        int u = path[i];
        int deg = sz(adj[u])-(u != m)-1;
        ans += deg;
    }

    auto ok = [&](int mid){
        int moves = 0;
        rep(i,sz(path)){
            int u = path[i];
            moves++;

            vector<int> vals;
            trav(v,adj[u]){
                if(on_path[v]) conts;
                vals.pb(dp[v]);
            }
            
            trav(x,vals){
                if(x > mid){
                    moves--;
                }
            }

            if(moves < 0) return false;
        }

        return true;
    };

    int l = 0, r = *max_element(all(dp));
    int mn_add = -1;

    while(l <= r){
        int mid = (l+r) >> 1;
        if(ok(mid)){
            mn_add = mid;
            r = mid-1;
        }
        else{
            l = mid+1;
        }
    }

    assert(mn_add != -1);
    ans += mn_add;

    cout << ans << endl;
}

int main()
{
    fastio;

    int t = 1;
    // cin >> t;

    rep1(i, t) {
        solve(i);
    }

    return 0;
}

Subtask #1
20.0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 27736 KB Output is correct
2 Correct 8 ms 27740 KB Output is correct
3 Correct 7 ms 27768 KB Output is correct
4 Correct 7 ms 27740 KB Output is correct
5 Correct 7 ms 27740 KB Output is correct
6 Correct 8 ms 27740 KB Output is correct
7 Correct 8 ms 27740 KB Output is correct
8 Correct 8 ms 27736 KB Output is correct
9 Correct 8 ms 27740 KB Output is correct
10 Correct 8 ms 27740 KB Output is correct

Subtask #2
25.0 / 25.0

# 결과 실행 시간 메모리 Grader output
1 Correct 278 ms 59176 KB Output is correct
2 Correct 270 ms 55892 KB Output is correct
3 Correct 811 ms 60260 KB Output is correct
4 Correct 355 ms 44116 KB Output is correct
5 Correct 849 ms 60292 KB Output is correct
6 Correct 785 ms 60264 KB Output is correct

Subtask #3
0 / 20.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 27736 KB Output is correct
2 Correct 8 ms 27740 KB Output is correct
3 Correct 7 ms 27768 KB Output is correct
4 Correct 7 ms 27740 KB Output is correct
5 Correct 7 ms 27740 KB Output is correct
6 Correct 8 ms 27740 KB Output is correct
7 Correct 8 ms 27740 KB Output is correct
8 Correct 8 ms 27736 KB Output is correct
9 Correct 8 ms 27740 KB Output is correct
10 Correct 8 ms 27740 KB Output is correct
11 Correct 8 ms 27740 KB Output is correct
12 Correct 8 ms 27740 KB Output is correct
13 Correct 8 ms 27740 KB Output is correct
14 Correct 8 ms 27996 KB Output is correct
15 Correct 8 ms 28248 KB Output is correct
16 Incorrect 8 ms 27740 KB Output isn't correct
17 Halted 0 ms 0 KB -

Subtask #4
0 / 35.0

# 결과 실행 시간 메모리 Grader output
1 Correct 8 ms 27736 KB Output is correct
2 Correct 8 ms 27740 KB Output is correct
3 Correct 7 ms 27768 KB Output is correct
4 Correct 7 ms 27740 KB Output is correct
5 Correct 7 ms 27740 KB Output is correct
6 Correct 8 ms 27740 KB Output is correct
7 Correct 8 ms 27740 KB Output is correct
8 Correct 8 ms 27736 KB Output is correct
9 Correct 8 ms 27740 KB Output is correct
10 Correct 8 ms 27740 KB Output is correct
11 Correct 278 ms 59176 KB Output is correct
12 Correct 270 ms 55892 KB Output is correct
13 Correct 811 ms 60260 KB Output is correct
14 Correct 355 ms 44116 KB Output is correct
15 Correct 849 ms 60292 KB Output is correct
16 Correct 785 ms 60264 KB Output is correct
17 Correct 8 ms 27740 KB Output is correct
18 Correct 8 ms 27740 KB Output is correct
19 Correct 8 ms 27740 KB Output is correct
20 Correct 8 ms 27996 KB Output is correct
21 Correct 8 ms 28248 KB Output is correct
22 Incorrect 8 ms 27740 KB Output isn't correct
23 Halted 0 ms 0 KB -