#include "dreaming.h"
#include <bits/stdc++.h>
#define ff first
#define ss second
#define pb push_back
#define ALL(x) x.begin(),x.end()
using namespace std;
using VI = vector <int>;
using PII = pair <int, int>;
const int N = 1e5+5;
vector <PII> paths[N];
bool vis[N];
int n, m, L, sizes[N], len;
PII dp[N];
PII getFarthest(int pos, int par = 0) {
dp[pos] = {0, pos};
for (auto [a, b] : paths[pos]) {
if (a == par) continue;
PII tmp = getFarthest(a, pos);
if (dp[pos].ff < tmp.ff + b) dp[pos] = {tmp.ff + b, tmp.ss};
}
return dp[pos];
}
int getSizes(int pos, int par = 0) {
vis[pos] = 1;
for (auto [a, b] : paths[pos]) {
if (a == par) continue;
sizes[pos] = max(sizes[pos], b + getSizes(a, pos));
}
return sizes[pos];
}
VI findCentroid(int pos, int par = 0, int pre = 0) {
int suf = len - pre;
VI res = {pos, pre, suf};
for (auto [a, b] : paths[pos]) {
if (a == par) continue;
VI tmp = findCentroid(a, pos, pre+b);
if (max(pre, suf) > max(tmp[1], tmp[2])) res = tmp;
}
return res;
}
VI getCentroid(int pos) {
len = getSizes(pos);
return findCentroid(pos);
}
int travelTime(int _N, int _M, int _L, int _A[], int _B[], int _T[]) {
n = _N;
m = _M;
L = _L;
vector <int> pts = {-1, -1, -1};
for (int i = 0; i < _M; i++) {
// paths[_A[i]].pb({_B[i], _T[i]});
// paths[_B[i]].pb({_A[i], _T[i]});
paths[_A[i]+1].pb({_B[i]+1, _T[i]});
paths[_B[i]+1].pb({_A[i]+1, _T[i]});
}
int res = 0;
for (int i = 1; i <= n; i++) {
if (vis[i]) continue;
PII tmp = getFarthest(i);
VI point = getCentroid(tmp.ss);
if (point[1] < point[2]) swap(point[1], point[2]);
// cout << '\t';for (int i = 0; i < 3; i++) cout << point[i] << " \n"[i==2];
pts[0] = (max(point[1], point[2]));
res = max(res, point[1]+point[2]);
sort(ALL(pts));
// cout << i-1 << ": " << point[0]-1 << ' ' << point[1] << ' ' << point[2] << '\n';
// cout << i << ": " << point[0] << ' ' << point[1] << ' ' << point[2] << '\n';
}
// for (int i = 0; i < 3; i++) cout << pts[i] << " \n"[i==2];
res = max(res, pts[2]+pts[1]+L);
if (pts[0] != -1) {
tmp = max(pts[0], pts[1]+pts[2]+2*L);
res = max(res, tmp);
}
// cout << res << '\n';
return res;
}
Compilation message
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:74:9: error: 'tmp' was not declared in this scope; did you mean 'tm'?
74 | tmp = max(pts[0], pts[1]+pts[2]+2*L);
| ^~~
| tm
