Submission #1205434

#	Time	Username	Problem	Language	Result	Execution time	Memory
1205434		bronze_coder	Permutation Game (APIO25_permgame)	C++20	6 / 100	2129 ms	1051116 KiB

permgame

#include "permgame.h"
#include <bits/stdc++.h>
using namespace std;

int Alice(int m, int e, vector<int> u, vector<int> v, int n, vector<int> p){
    vector<int> degree(n,0);
    for(int i:u){
        degree[i]++;
    }
    for(int i:v){
        degree[i]++;
    }
    int ans = 0;
    for(int i=0;i<n;i++){
        if(p[i]==i){
            ans++;
        }
    }
    for(int i:degree){
        if(i>2){
            return ans;
        }
    }
    if(ans>n-m&&(m!=2||ans==n)){
        return ans;
    }

    vector<vector<int>> adj(m);
    for(int i=0;i<e;i++){
        adj[u[i]].push_back(v[i]);
        adj[v[i]].push_back(u[i]);
    }

    vector<int> order;

    for(int i=0;i<e;i++){
        if(adj[i].size()==1||e==m){
            order.push_back(i);
            i = adj[i][0];
            while(adj[i].size()==2){
                order.push_back(i);
                if(adj[i][0]==order[order.size()-2]){
                    i = adj[i][1];
                }
                else{
                    i = adj[i][0];
                }
            }
            order.push_back(i);
            break;
        }
    }


    if(e==m-1){
        while(ans<n-m+2-min(m-2,1)){
            vector<int> visited(n,0);
            vector<int> query(n);
            int count = 0;
            for(int i=0;i<n;i++){
                if(p[i]!=i&&visited[i]==0&&query.size()<m){
                    int j = i;
                    while(visited[j]==0){
                        query[order[count]] = j;
                        count++;
                    }
                    visited[i] = 1;
                }
            }
            int t = Bob(query);
            swap(p[u[t]],p[v[t]]);
            ans = 0;
            for(int i=0;i<n;i++){
                if(p[i]==i){
                    ans++;
                }
            }
        }
        return n-m+2-min(m-2,1);
    }
}

Compilation message (stderr)

permgame.cpp: In function 'int Alice(int, int, std::vector<int>, std::vector<int>, int, std::vector<int>)':
permgame.cpp:81:1: warning: control reaches end of non-void function [-Wreturn-type]
   81 | }
      | ^

• Subtask 0: 0 / 0
• Subtask 1: 0 / 6
• Subtask 2: 6 / 6
• Subtask 3: 0 / 10
• Subtask 4: 0 / 24
• Subtask 5: 0 / 24
• Subtask 6: 0 / 30