oj.uz

답안 #741252

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
741252 2023-05-13T23:55:52 Z Pichon5 Logičari (COCI21_logicari) C++17
10 / 110
 200 ms 32788 KB 
#include <iostream>
#include <vector>
#include <set>
#include <map>
#include <algorithm>
#include <string>
#include <sstream>
#include <fstream>
#include <cmath>
#include <queue>
#include <stack>
#include <unordered_map>
#include <unordered_set>
#include <bitset>
#include <bits/stdc++.h>
#define lcm(a,b) (a/__gcd(a,b))*b
#define jumanji ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
#define pb push_back
#define F first
#define S second
#define int long long
#define vi vector<int>
#define ll long long
using namespace std;

vector<vi>G;
//fin endpoints of one edge in a cycle of an undirected graph
int A,B;
const int tam=1e5+100;
const int INF=1e9;
int dp[tam][2][2][2][2];
int f(int nodo, int c,int cP, int cA, int cB, int padre){
    if(dp[nodo][c][cP][cA][cB] != -1) return dp[nodo][c][cP][cA][cB];
    if(nodo==A && c!=cA)return dp[nodo][c][cP][cA][cB]=INF;
    if(nodo==B && c!=cB)return dp[nodo][c][cP][cA][cB]=INF;
    if(nodo==B && cA && cP)return dp[nodo][c][cP][cA][cB]=INF;
    bool ok=0;
    if(cP)ok=1;
    if(nodo==A && cB)ok=1;
    if(nodo==B && cA)ok=1;
    int sum=c;
    for(auto v:G[nodo]){
        if(v==padre)continue;
        sum+=f(v,0,c,cA,cB,nodo);
    }
    dp[nodo][c][cP][cA][cB]=INF;
    if(ok){
        dp[nodo][c][cP][cA][cB]=sum;
    }else{
        for(auto v:G[nodo]){
            if(v==padre)continue;
            dp[nodo][c][cP][cA][cB]=min(dp[nodo][c][cP][cA][cB],sum-f(v,0,c,cA,cB,nodo)+f(v,1,c,cA,cB,nodo));
        }
    }
    return dp[nodo][c][cP][cA][cB];
}

//union find
int p[tam];
int find(int x){
    if(x==p[x])return x;
    return p[x]=find(p[x]);
}
void join(int x,int y){
    x=find(x);
    y=find(y);
    if(x==y)return;
    p[x]=y;
}
signed main(){
    jumanji
    memset(dp,-1,sizeof dp);
    int n,a,b;
    cin>>n;
    for(int i=0;i<=n;i++)p[i]=i;

    vector<pair<int,int>>edges;
    G.resize(n+1);
    for(int i=0;i<=n;i++){
        cin>>a>>b;
        if(find(a)==find(b)){
            A=a;
            B=b;
        }else{
            join(a,b);
            G[a].pb(b);
            G[b].pb(a);
        }
    }
    ll res=INF;
    res=min(res,f(A,0,0,0,0,-1));
    res=min(res,f(A,0,0,0,1,-1));
    res=min(res,f(A,1,0,1,0,-1));
    res=min(res,f(A,1,0,1,1,-1));
    if(res>=INF)cout<<-1<<endl;
    else cout<<res<<endl;




    return 0;
}  
//Guess i wont be comming to church on sunday

Subtask #1
10.0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 12756 KB Output is correct
2 Correct 6 ms 12756 KB Output is correct
3 Correct 7 ms 12756 KB Output is correct
4 Correct 7 ms 12788 KB Output is correct
5 Correct 159 ms 31632 KB Output is correct
6 Correct 164 ms 32772 KB Output is correct
7 Correct 200 ms 32788 KB Output is correct
8 Correct 183 ms 32716 KB Output is correct

Subtask #2
0 / 10.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 12756 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 40.0

# 결과 실행 시간 메모리 Grader output
1 Incorrect 5 ms 12756 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #4
0 / 50.0

# 결과 실행 시간 메모리 Grader output
1 Correct 6 ms 12756 KB Output is correct
2 Correct 6 ms 12756 KB Output is correct
3 Correct 7 ms 12756 KB Output is correct
4 Correct 7 ms 12788 KB Output is correct
5 Correct 159 ms 31632 KB Output is correct
6 Correct 164 ms 32772 KB Output is correct
7 Correct 200 ms 32788 KB Output is correct
8 Correct 183 ms 32716 KB Output is correct
9 Incorrect 5 ms 12756 KB Output isn't correct
10 Halted 0 ms 0 KB -