#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define pb push_back
#define all(x) x.begin(), x.end()
void allocate_tickets(vector<vector<int>> _x);
long long find_maximum(int k, vector<vector<int>> _arr) {
int N = _arr.size(), M = _arr[0].size();
vector<vector<int>> answer;
for (int i = 0; i < N; i++) {
std::vector<int> row(M, -1);
answer.push_back(row);
}
vector<vector<int>> unused(N), small(N);
ll ans = 0;
for(int i = 0; i < N; ++i){
for(int j = 0; j < k; ++j) small[i].pb(_arr[i][j]);
for(int j = k; j < M; ++j) unused[i].pb(_arr[i][j]);
}
for(int i = 0; i < k; ++i){
priority_queue<pair<int, int>> q;
for(int j = 0; j < N; ++j) q.push({unused[j].back() + small[j].back(), j});
for(int j = 0; j < N; ++j){
int v = q.top().second;
q.pop();
if(j < N/2){
ans += unused[v].back();
answer[v][k - 1 + unused[v].size()] = i;
}else{
ans -= small[v].back();
answer[v][small[v].size() - 1] = i;
}
unused[v].pop_back();
small[v].pop_back();
}
}
allocate_tickets(answer);
return ans;
}
