치킨 배달.cc

#include<bits/stdc++.h>
using namespace std;
int n, m, a[54][54], result = 987654321;
vector<vector<int>> chickenList;
vector<pair<int, int>> _home, chicken;
void combi(int start, vector<int> v){
    if(v.size() == m){
        chickenList.push_back(v);
        return;
    }
    for(int i=start+1; i<chicken.size(); i++){
        v.push_back(i);
        combi(i, v);
        v.pop_back();
    }
    return;
}
int main(){
    ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
    cin >> n >> m;
    for(int i=0; i<n; i++){
        for(int j=0; j<n; j++){
            cin >> a[i][j];
            if(a[i][j] == 1) _home.push_back({i, j});
            if(a[i][j] == 2) chicken.push_back({i, j});
        }
    }
    vector<int> v;
    combi(-1, v);
    for(vector<int> cList : chickenList){
        int ret = 0;
        for(pair<int, int> home: _home){
            int _min = 987654321;
            for(int ch : cList){
                int _dist = abs(home.first - chicken[ch].first) + abs(home.second - chicken[ch].second);
                _min = min(_min, _dist);
            }
            ret += _min;
        }
        result = min(result, ret);
    }
    cout << result << "\n";
    return 0;
}