This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
const int N = 1005;
int sz[N], pref[N];
vector<int> val, g[N];
void pre_dfs(int v, int p = -1){
sz[v] = 1;
for (int u : g[v]){
if (u == p) continue;
pre_dfs(u, v);
sz[v] += sz[u];
}
}
void dfs(int v, int p = -1){
pref[v] = 0;
for (int u : g[v]){
if (u == p) continue;
pref[v] += sz[u];
val[u] = val[v] - sz[v] + pref[v];
dfs(u, v);
}
}
vector<int> label(int n, int k, vector<int> u, vector<int> v){
for (int i = 0; i <= n; i ++)
pref[i] = sz[i] = 0, g[i].clear();
val.resize(n, 0);
for (int i = 0; i < n - 1; i ++){
g[u[i]].push_back(v[i]);
g[v[i]].push_back(u[i]);
}
pre_dfs(0);
val[0] = sz[0];
dfs(0);
return val;
}
int find_next_station(int s, int t, vector<int> c){
for (int i = 0; i + 1 < c.size(); i ++)
assert(s > c[i]);
// assert(s < c.back());
for (int x : c){
if (t <= x){
return x;
}
}
int x = c.back();
return x;
}
// int main(){
// int t;
// cin >> t;
// while (t--){
// int n, k;
// cin >> n >> k;
// vector<int> u(n - 1), v(n - 1);
// for (int i = 0; i < n - 1; i ++)
// cin >> u[i] >> v[i];
// label(n, k, u, v);
// for (int i = 0; i < n; i ++){
// cout << i << " :: " << val[i] << endl;
// }
// for (int i = 0; i < n; i ++){
// for (int j = 0; j < n; j ++){
// if (i == j) continue;
// vector<int> adj;
// for (int x : g[i])
// adj.push_back(val[x]);
// sort(adj.begin(), adj.end());
// int res = find_next_station(val[i], val[j], adj);
// cout << val[i] << " -- " << val[j] << " == " << res << endl;
// }
// }
// }
// }
/*
10 10
0 1
1 2
2 3
3 4
4 5
5 6
6 7
7 8
8 9
*/
Compilation message (stderr)
stations.cpp: In function 'int find_next_station(int, int, std::vector<int>)':
stations.cpp:44:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
44 | for (int i = 0; i + 1 < c.size(); i ++)
| ~~~~~~^~~~~~~~~~
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