#include "grader.h"
#include "traffic.h"
#include <vector>
using namespace std;
int n;
int cnt[1000100];
vector<int> adj[1000100];
long long size[1000100];
void dfs1 (int x, int p) {
size[x] = cnt[x];
for (auto i: adj[x]) {
if (i != p) {
dfs1(i, x);
size[x] += size[i];
}
}
}
long long ot = 1e14, oi;
void dfs2 (int x, int p, int u) {
long long ans = u;
for (auto i: adj[x]) {
if (i != p) {
ans = max(ans, size[i]);
dfs2(i, x, u+size[x]-size[i]);
}
}
if (ans < ot) {
ot = ans;
oi = x;
}
}
int LocateCentre (int N, int P[], int S[], int D[]) {
n = N;
for (int i=0; i<n; i++) {
cnt[i] = P[i];
}
for (int i=0; i<n-1; i++) {
adj[S[i]].push_back(D[i]);
adj[D[i]].push_back(S[i]);
}
dfs1(0, 0);
dfs2(0, 0, 0);
cout << oi << endl;
}
Compilation message
traffic.cpp:1:10: fatal error: grader.h: No such file or directory
#include "grader.h"
^~~~~~~~~~
compilation terminated.
