Submission #1221820

#	Time	Username	Problem	Language	Result	Execution time	Memory
1221820		brinton	Permutation Game (APIO25_permgame)	C++20	6 / 100	2 ms	328 KiB

permgame

#include "permgame.h"
#include <bits/stdc++.h>
using namespace std;
/*
m: vertices in u,v
e: edges in u,v
n: permutation length;
*/
int Alice(int m, int e, vector<int> u, vector<int> v, int N, vector<int> p) {
    int already = 0;
    for(int i = 0;i < N;i++) if(p[i]==i) already++;
    vector<vector<int>> edges(m);
    vector<int> deg(m,0);
    for(int i = 0;i < e;i++){
        edges[u[i]].push_back(v[i]);
        edges[v[i]].push_back(u[i]);
        deg[u[i]]++;deg[v[i]]++;
    }
    

    if(e > m || *max_element(deg.begin(),deg.end()) > 2) {
        return already;
    }else if(e == m-1){
        set<int> s;
        for(int i = 0;i < N;i++) if(p[i] != i) s.insert(i);
        while(s.size() >= m){
            vector<int> t(s.begin(),next(s.begin(),m));
            int j = Bob(t);
            swap(p[t[u[j]]], p[t[v[j]]]);
            if(p[t[u[j]]] == t[u[j]]) s.erase(t[u[j]]);
            if(p[t[v[j]]] == t[u[j]]) s.erase(t[v[j]]);
        }
        return N-m;
    }
}

Compilation message (stderr)

permgame.cpp: In function 'int Alice(int, int, std::vector<int>, std::vector<int>, int, std::vector<int>)':
permgame.cpp:35:1: warning: control reaches end of non-void function [-Wreturn-type]
   35 | }
      | ^

• 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