Submission #300375

#	Time	Username	Problem	Language	Result	Execution time	Memory
300375		easrui	Carnival Tickets (IOI20_tickets)	C++14	Compilation error	0 ms	0 KiB

tickets

#include "tickets.h"
#include <bits/stdc++.h>
#define va first
#define vb second
#define all(x) (x).begin(), (x).end()
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
typedef pair<pii,int> ppi;
typedef pair<int,pii> pip;

const int MN = 1505;
const int MOD = 1e9+7;
const int INF = 1e9;

vector<pii> T;
int a[MN],s[MN],cur[MN],D[MN],U[MN];
int n,m;

int cal(int x)
{
	return D[x]+1+n-U[x];
}

bool cmp(int x, int y)
{
	return s[x]<s[y];
}

ll find_maximum(int k, vector<vector<int>> x) {
	n = x.size();
	m = x[0].size();
	vector<vector<int>> ans;

	vector<int> row(m,-1);
	for(int i=0; i<n; i++){
		ans.push_back(row);
	}

	for(int i=0; i<n; i++)
		for(int j=0; j<n; j++)
			T.emplace_back(x[i][j],i);
	sort(all(T));
	int s=0, e=n*m-1;
	for(int i=0; i<n; i++){
		D[i] = -1;
		U[i] = n;
	}
	while(s<n*k/2){
		D[T[s].vb]++;
		s++;
	}
	while(e>=n*(m-k)/2){
		U[T[e].vb]--;
		e--;
	}

	int cnt = 0;
	priority_queue<pip> PQ;

	for(int i=0; i<n; i++){
		PQ.emplace(cal(i),pii{i,++cnt});
		cur[i] = cnt;
	}

	while(PQ.top().va>k){
		int q = PQ.top().vb.vb;
		if(T[s].va-D[q]<U[q]-T[e].va){
			D[q]--;
			PQ.emplace(cal(q),pii{q,++cnt});
			cur[q] = cnt;
			D[T[s].vb]++;
			PQ.emplace(cal(T[s].vb),pii{T[s].vb,++cnt});
			cur[T[s].vb] = cnt;
			s++;
		}
		else{
			U[q]++;
			PQ.emplace(cal(q),pii{q,++cnt});
			cur[q] = cnt;
			U[T[e].vb]--;
			PQ.emplace(cal(T[e].vb),pii{T[e].vb,++cnt});
			cur[T[e].vb] = cnt;
			e--;
		}
		while(PQ.top().vb.vb!=cur[PQ.top().vb.va]) PQ.pop();
	}

	for(int i=0; i<k; i++){
		vector<int> v;
		for(int j=0; j<n; i++) v.push_back(D[j]);
		sort(all(v));
		for(int j=0; j<n; j++){
			vector<int> v;
			if(D[j]>=v[n/2]){
				ans[j][D[j]] = i;
				D[j]--;
			}
			else{
				ans[j][U[j]] = i;
				U[j]++;
			}
		}
	}
	allocate_tickets(ans);
	return sum;
}

Compilation message (stderr)

tickets.cpp: In function 'll find_maximum(int, std::vector<std::vector<int> >)':
tickets.cpp:106:9: error: 'sum' was not declared in this scope
  106 |  return sum;
      |         ^~~