#include "train.h"
#include <bits/stdc++.h>
using namespace std;
int n, m, k, vis[5005], scc[5005];
vector<int> E[5005], R[5005];
vector<int> order;
vector<int> cc[5005];
void dfs(int u)
{
vis[u] = 1;
for (auto v : E[u])
if (!vis[v])
dfs(v);
order.emplace_back(u);
}
void dfscc(int u, int c)
{
vis[u] = 1;
scc[u] = c;
cc[c].emplace_back(u);
for (auto v : R[u])
if (!vis[v])
dfscc(v, c);
}
vector<int> who_wins(vector<int> a, vector<int> r, vector<int> u, vector<int> v)
{
n = a.size(), m = u.size(), k = 0;
for (int i = 0; i < n; i++)
vis[i] = 0, E[i].clear(), R[i].clear(), cc[i].clear();
for (int i = 0; i < m; i++)
if (a[u[i]] == 1 && a[v[i]] == 1)
{
E[u[i]].emplace_back(v[i]);
R[v[i]].emplace_back(u[i]);
}
for (int i = 0; i < n; i++)
if (!vis[i])
dfs(i);
reverse(order.begin(), order.end());
for (int i = 0; i < n; i++)
vis[i] = 0;
for (int i : order)
if (!vis[i])
dfscc(i, k++);
sort(order.begin(), order.end(), [&](int i, int j)
{ return cc[i] > cc[j]; });
vector<int> ans(n, 0);
for (int i = k - 1; i >= 0; i--)
{
int flag = 0;
for (int j : cc[i])
{
for (int p : E[j])
if (ans[p])
flag = 1;
if(r[j] == 1)
flag = 1;
}
if(flag)
for (int j : cc[i])
ans[j] = 1;
}
return ans;
vector<int>
loop(n, 0);
for (int i = 0; i < n; i++)
if (a[i] == 0)
{
vector<int> req(n, 0);
for (int j = 0; j < n; j++)
if (r[j])
req[j] = 1e9;
else if (a[j])
req[j] = E[j].size();
else
req[j] = 1;
queue<int> q;
q.push(i);
while (!q.empty())
{
int x = q.front();
q.pop();
for (auto y : R[x])
if (--req[y] == 0)
q.emplace(y);
}
loop[i] = req[i] <= 0;
}
vector<int> ans(n, 1);
vector<int> req(n, 0);
queue<int> q;
for (int j = 0; j < n; j++)
if (loop[j])
{
q.push(j);
req[j] = 0;
}
else if (a[j])
req[j] = E[j].size();
else
req[j] = 1;
while (!q.empty())
{
int x = q.front();
ans[x] = 0;
q.pop();
for (auto y : R[x])
if (--req[y] == 0)
q.emplace(y);
}
return ans;
}
Compilation message
train.cpp: In function 'std::vector<int> who_wins(std::vector<int>, std::vector<int>, std::vector<int>, std::vector<int>)':
train.cpp:97:14: error: redeclaration of 'std::vector<int> ans'
97 | vector<int> ans(n, 1);
| ^~~
train.cpp:54:14: note: 'std::vector<int> ans' previously declared here
54 | vector<int> ans(n, 0);
| ^~~
