#include "closing.h"
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
using namespace std;
using namespace __gnu_pbds;
template <typename T1, typename T2>
using indexed_map = tree<T1, T2, less<T1>, rb_tree_tag, tree_order_statistics_node_update>;
#define int long long
#define pb push_back
#define loop(x, i) for (int i = 0; i < x; i++)
#define rev(x, i) for (int i = (int)(x) - 1; i >= 0; i--)
#define ALL(x) begin(x), end(x)
typedef pair<int, int> ii;
typedef signed i32;
typedef vector<ii> vii;
typedef vector<int> vi;
typedef vector<i32> vi32;
typedef vector<bool> vb;
typedef vector<vi> vvi;
typedef vector<vii> vvii;
i32 max_score(i32 N, i32 X, i32 Y, int K, vi32 U, vi32 V, vi32 W)
{
assert(N <= 20);
vvii adj(N);
loop(N - 1, i)
{
adj[U[i]].pb({V[i], W[i]});
adj[V[i]].pb({U[i], W[i]});
}
vi xTime(N), yTime(N);
auto dfs = [&](auto &&self, int i, int prev, vi &time) -> void
{
for (auto [j, w] : adj[i])
{
if (j == prev)
continue;
time[j] = time[i] + w;
self(self, j, i, time);
}
};
dfs(dfs, X, X, xTime);
dfs(dfs, Y, Y, yTime);
vi maxTime(N);
loop(N, i) maxTime[i] = max(xTime[i], yTime[i]);
int res = 0;
for (unsigned mask = 0; mask < (1 << N); mask++)
{
int cur = 2 * popcount(mask);
int sum = 0;
int first = -1;
vb added(N);
loop(N, i)
{
if ((1 << i) & mask)
{
added[i] = 1;
first = i;
sum += maxTime[i];
}
}
int connected = 0;
auto dfs2 = [&](auto &&self, int i, int prev) -> void
{
if (!added[i])
return;
if ((1 << i) & mask)
connected++;
for (auto [j, w] : adj[i])
{
if (j == prev)
continue;
self(self, j, i);
}
};
if (first != -1)
dfs2(dfs2, first, first);
if (connected != popcount(mask))
continue;
if (sum > K)
{
continue;
}
vb vis(N);
priority_queue<ii> q;
q.push({0, X});
q.push({0, Y});
while (!q.empty())
{
auto [d, i] = q.top();
q.pop();
if (vis[i])
continue;
vis[i] = 1;
if (!((1 << i) & mask))
{
cur++;
sum -= d;
}
if (sum > K)
{
cur--;
break;
}
added[i] = 1;
for (auto [j, w] : adj[i])
{
if (vis[j])
continue;
q.push({d - w, j});
}
}
connected = 0;
dfs2(dfs2, X, X);
if (connected != popcount(mask))
continue;
connected = 0;
dfs2(dfs2, Y, Y);
if (connected != popcount(mask))
continue;
if (cur > res)
{
res = cur;
}
}
return res;
}
Compilation message
closing.cpp: In function 'i32 max_score(i32, i32, i32, long long int, vi32, vi32, vi32)':
closing.cpp:49:34: warning: comparison of integer expressions of different signedness: 'unsigned int' and 'int' [-Wsign-compare]
49 | for (unsigned mask = 0; mask < (1 << N); mask++)
| ~~~~~^~~~~~~~~~
closing.cpp:51:23: error: 'popcount' was not declared in this scope
51 | int cur = 2 * popcount(mask);
| ^~~~~~~~
