#include <bits/stdc++.h>
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-O3")
#pragma GCC optimize("Ofast")
#pragma GCC optimize("fast-math")
#pragma GCC optimize("no-stack-protector")
int read(int x = 0, int f = 0, char ch = getchar())
{
while ('0' > ch or ch > '9')
f = ch == '-', ch = getchar();
while ('0' <= ch and ch <= '9')
x = x * 10 + (ch ^ 48), ch = getchar();
return f ? -x : x;
}
const int N = 1e6 + 10;
int n;
int L[N], R[N];
void convert(std::vector<char> &res, int x)
{
for (; x; x /= 2)
res.push_back(x % 2 ? '1' : '0');
std::reverse(res.begin(), res.end());
}
std::vector<char> dfs(int v)
{
std::vector<char> a, b;
if (L[v] < 0) a = dfs(abs(L[v])); else convert(a, L[v]);
if (R[v] < 0) b = dfs(abs(R[v])); else convert(rb, R[v]);
if (a.size() < b.size())
swap(a, b);
if (a.size() ^ b.size())
return a.push_back('0'), a;
for (int i = 0; i < int(a.size()); i++)
{
if (a[i] == b[i])
continue;
if (b[i] == '1')
std::swap(a, b);
break;
}
return a.push_back('0'), a;
}
int main()
{
n = read();
for (int i = 1; i <= n; i++)
{
int l = read(), r = read();
if (l < 0) L[i] = abs(l); else L[i] = -l;
if (r < 0) R[i] = abs(r); else R[i] = -r;
}
std::vector<char> ans = dfs(1);
for (auto x : ans)
printf("%c", x);
return 0;
}
Compilation message
poklon.cpp: In function 'std::vector<char> dfs(int)':
poklon.cpp:34:52: error: 'rb' was not declared in this scope; did you mean 'b'?
34 | if (R[v] < 0) b = dfs(abs(R[v])); else convert(rb, R[v]);
| ^~
| b
