#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
vector<vector<pair<ll,ll>>>graph;
vector<bool> vis;
void dfs1(vector<ll> &dist, ll x, ll d){
vis[x] = true;
dist[x] = d;
for (auto [y, w] : graph[x]){
if (!vis[y]){
dfs1(dist, y, d + w);
}
}
}
void dfs2(vector<pair<ll,ll>>dist, ll x, ll d){
vis[x] = true;
dist[x].first= d;
for (auto [y, w] : graph[x]){
if (!vis[y]){
dfs2(dist, y, d + w);
}
}
}
ll max_score(int N, int X, int Y, ll K, vector<int> U, vector<int> V, vector<int> W){
graph.assign(N,vector<pair<ll,ll>>());
for(ll i=0;i<(N-1);i++){
graph[U[i]].push_back({V[i],W[i]});
graph[V[i]].push_back({U[i],W[i]});
}
vis.assign(N,false);
vector<ll>distX(N);
dfs1(distX,X,0);
vis.assign(N,false);
vector<ll>distY(N);
dfs1(distY,Y,0);
vis.assign(N,false);
vector<pair<ll,ll>>orden;
for(ll i=0;i<N;i++){c
pair<ll,ll>par;
par.first=0;
par.second=i;
orden.push_back(par);
}
dfs2(orden,max_element(distX.begin(),distX.end())-distX.begin(),0);
sort(orden.begin(),orden.end());
ll pos_x;
ll pos_y;
for(ll i=0;i<N;i++){
if(orden[i].second==X){
pos_x=i;
}
else if(orden[i].second==Y){
pos_y=i;
}
}
pos_x++;
pos_y++;
vector<ll>prefix1(N+1,0);
for(ll i=0;i<N;i++){
prefix1[i+1]=prefix1[i]+distX[orden[i].second];
}
vector<ll>prefix2(N+1,0);
for(ll i=0;i<N;i++){
prefix2[i+1]=prefix2[i]+distY[orden[i].second];
}
ll ans=0;
for(ll i=0;i<pos_x;i++){
for(ll j=pos_x;j<=N;j++){
for(ll k=0;k<pos_y;k++){
for(ll l=pos_y;l<=N;l++){
if((prefix1[j]-prefix1[i]+prefix2[l]-prefix2[k])<=K){
ans=max((j-i+l-k),ans);
}
}
}
}
}
return ans;
}
Compilation message
closing.cpp: In function 'll max_score(int, int, int, ll, std::vector<int>, std::vector<int>, std::vector<int>)':
closing.cpp:38:22: error: 'c' was not declared in this scope
38 | for(ll i=0;i<N;i++){c
| ^
closing.cpp:40:3: error: 'par' was not declared in this scope; did you mean '__pstl::execution::v1::par'?
40 | par.first=0;
| ^~~
| __pstl::execution::v1::par
In file included from /usr/include/c++/10/pstl/glue_algorithm_defs.h:15,
from /usr/include/c++/10/algorithm:74,
from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:65,
from closing.cpp:1:
/usr/include/c++/10/pstl/execution_defs.h:111:27: note: '__pstl::execution::v1::par' declared here
111 | constexpr parallel_policy par{};
| ^~~
