//Make CSP great again
//Vengeance
#include <bits/stdc++.h>
#include <swap.h>
#define TASK "TESTCODE"
#define Log2(x) 31 - __builtin_clz(x)
using namespace std;
const int N = 1e5, M = 2e5, K = N + M, cbit = 18, oo = 1e9 + 1;
int f[K + 1][cbit + 1], id[M + 1];
int n, m;
int lab[K + 1], weight[K + 1], deg[K + 1], depth[K + 1];
bool able[K + 1];
vector<int> adj[K + 1];
int FindSet(int u)
{
return lab[u] < 0 ? u : lab[u] = FindSet(lab[u]);
}
void unite(int u, int v, int w)
{
u = FindSet(u);
v = FindSet(v);
if (u == v)
{
if (!able[u])
{
able[u] = true;
weight[u] = w;
}
return ;
}
bool check = deg[u] > 1 | deg[v] > 1;
++n;
able[n] = able[u] | able[v] | check;
if (able[n])
{
weight[n] = w;
}
++deg[u];
++deg[v];
lab[u] = lab[v] = n;
adj[n].push_back(u);
adj[n].push_back(v);
//cerr << n << ' ' << u << '\n';
//cerr << n << ' ' << v << '\n';
}
void DFS(int u, int par)
{
if (par != 0 && !able[u])
{
weight[u] = weight[par];
}
//cerr << u << ' ' << weight[u] << '\n';
for (int v : adj[u])
{
//cerr << u << ' ' << v << '\n';
depth[v] = depth[u] + 1;
f[v][0] = u;
for (int i = 1; i <= cbit; ++ i)
{
f[v][i] = f[f[v][i - 1]][i - 1];
}
DFS(v, u);
}
}
int get(int u, int v)
{
if (depth[v] < depth[u])
{
swap(u, v);
}
int k = depth[v] - depth[u];
for (int i = cbit; i >= 0; -- i)
{
if ((k >> i) & 1)
{
v = f[v][i];
}
}
if (u == v)
{
//cerr << u << '\n';
return weight[u]
}
for (int i = cbit; i >= 0; -- i)
{
if (f[u][i] != f[v][i])
{
u = f[u][i];
v = f[v][i];
}
}
//cerr << f[u][0] << '\n';
return weight[f[u][0]];
}
void init(int _n, int _m, vector<int> u, vector<int> v, vector<int> w)
{
n = _n;
m = _m;
iota(id, id + m, 0);
memset(lab, -1, sizeof(lab));
memset(weight, -1, sizeof(weight));
sort(id, id + m, [&](const int &a, const int &b)
{
return w[a] < w[b];
});
for (int i = 0; i < m; ++ i)
{
unite(u[id[i]] + 1, v[id[i]] + 1, w[id[i]]);
}
DFS(n, 0);
}
int getMinimumFuelCapacity(int X, int Y)
{
return get(X + 1, Y + 1);
}
/*void read()
{
init(5, 6, {0, 0, 1, 1, 1, 2}, {1, 2, 2, 3, 4, 3}, {4, 4, 1, 2, 10, 3});
}
void solve()
{
cout << getMinimumFuelCapacity(0, 1);
}
int main()
{
ios_base::sync_with_stdio(false);
cin.tie(nullptr);
if (fopen(TASK".INP", "r"))
{
freopen(TASK".INP", "r", stdin);
//freopen(TASK".OUT", "w", stdout);
}
int t = 1;
bool typetest = false;
if (typetest)
{
cin >> t;
}
for (int __ = 1; __ <= t; ++ __)
{
//cout << "Case " << __ << ": ";
read();
solve();
}
}*/
Compilation message
swap.cpp: In function 'void unite(int, int, int)':
swap.cpp:31:25: warning: suggest parentheses around comparison in operand of '|' [-Wparentheses]
31 | bool check = deg[u] > 1 | deg[v] > 1;
| ~~~~~~~^~~
swap.cpp: In function 'int get(int, int)':
swap.cpp:82:25: error: expected ';' before '}' token
82 | return weight[u]
| ^
| ;
83 | }
| ~
