Submission #500254

#	Time	Username	Problem	Language	Result	Execution time	Memory
500254		sidon	Mechanical Doll (IOI18_doll)	C++17	Compilation error	0 ms	0 KiB

doll

#include <bits/stdc++.h>
using namespace std;
#include "doll.h"
 
vector<int> s, x(1<<18), y(1<<18), z(1<<18);
int cnt, v = -1, rt = -1, b, n;
 
int dfs(int l, int r) {
	if(l >= n) return -1;
	if(r - l < 2) {
		return 1;
	} else {
		int m = (l + r) / 2;
		int u = cnt++;
		y[u] = dfs(l, m);
		x[u] = dfs(m, r);
		return -u-1;
	}
}
 
void create_circuit(int M, vector<int> A) {
	s.assign(M+1, -1);
    x.assign(2*N, 0);
    y.assign(2*N, 0);
    z.assign(2*N, 0);
	
  	A.push_back(0);
	cnt = b = 0, v = -1, rt = -1, n = size(A);
 
	while((1<<b)<n) ++b;
	dfs(0, 1<<b);
 
	for(int &i : A) {
		int u = 0;
		while(u >= 0) {
			z[u] ^= 1;
			int w = -1-(z[u] ? x[u] : y[u]);
			if(w < 0) {
				(z[u] ? x[u] : y[u]) = i;
				rt = u; u = -1;
			} else u = w;
		}
	}
 
	if(n > 2) {
		x[cnt] = -1-cnt;
		y[rt] = -1-cnt++;
	}
 
	x.resize(cnt);
	y.resize(cnt);
	answer(s, x, y);
}

Compilation message (stderr)

doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:23:16: error: 'N' was not declared in this scope
   23 |     x.assign(2*N, 0);
      |                ^