Submission #1363738

#TimeUsernameProblemLanguageResultExecution timeMemory
1363738marcus328Permutation Game (APIO25_permgame)C++20
6 / 100
1 ms344 KiB
#include "permgame.h"
#include <vector>
#include <utility>
#include <bits/stdc++.h>
using namespace std;

#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define F(i,L,R) for (int i = L; i < R; i++)
#define FE(i,L,R) for (int i = L; i <= R; i++)
#define FF(i,L,R) for (int i = L; i > R; i--)
#define FFE(i,L,R) for (int i = L; i >= R; i--)
#define ms(a,x) memset(a,x,sizeof(a))
#define ALL(c) (c).begin(),(c).end()
#define SZ(a) sizeof(a)
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int,int> ii;  
typedef vector<string> vs;
typedef vector<bool> vb;
typedef vector<vb> vvb;
typedef vector<char> vc;
typedef vector<vc> vvc;

int Alice(int m, int e, std::vector<int> u, std::vector<int> v, int n, std::vector<int> p) {
    int cnt = 0;
    int primer_i = -1;
    for(int i = 0; i < n; i++){
        if(p[i] == i) cnt++;
        else if(primer_i == -1) primer_i = i;
    }
    vi g[n];
    for(int i = 0; i < e; i++){
        g[u[i]].pb(v[i]);
        g[v[i]].pb(u[i]);
    }
    int start_idx = -1;
    for(int i = 0; i < m; i++){
        if(g[i].size() > 2){
            return cnt;
        }
        if(g[i].size() == 1){
            start_idx = i;
        }
    }

    vb vis(n, 0);
    vi t(m);
    int temp = start_idx, last = -1;
    bool conn = 0;
    for(int i = 0; i < n; i++){
        if(p[i] != i && !vis[i]){
            int cur = i;
            do{
                vis[cur] = 1;
                t[temp] = cur;
                if(g[temp].size() == 1 && last != -1){
                    int j = Bob(t);
                    if(p[t[u[j]]] == t[v[j]] || p[t[v[j]]] == t[u[j]]){
                        swap(p[t[u[j]]], p[t[v[j]]]);
                        if(p[t[u[j]]] != t[u[j]]){
                            temp = u[j];
                        }else{
                            temp = v[j];
                        }
                    }else{
                        conn = 1;
                        if(p[t[u[j]]] == primer_i){
                            temp = u[j];
                        }else{
                            temp = v[j];
                        }
                        swap(p[t[u[j]]], p[t[v[j]]]);
                    }
                    cur = t[temp];
                    if(p[t[g[temp][0]]] == t[temp]){
                        last = g[temp][0];
                    }else{
                        last = g[temp][1]; 
                    }                
                }
                if(g[temp][0] != last){
                    last = temp;
                    temp = g[temp][0];
                }else{
                    last = temp;
                    temp = g[temp][1];
                }
                cur = p[cur];
            }while(cur != primer_i && (conn || cur != i));
            conn = 0;
        }
    }

    return max(n - m + 1, cnt);
}
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