#include <bits/stdc++.h>
#define pii pair<int,int>
#define x first
#define y second
using namespace std;
const int NMAX=1e5+7;
int vis[NMAX];
pii mx1[NMAX],mx2[NMAX];
vector<pii> g[NMAX];
int ans=0;
int naj=1e9+7;
void dfs(int son, int par)
{
vis[son]=1;
for(pii nxt:g[son])
{
if(nxt.x==par) continue;
dfs(nxt.x,son);
pii tmp={mx1[nxt.x].x+nxt.y,nxt.x};
if(tmp>mx1[son]) swap(mx1[son],tmp);
if(tmp>mx2[son]) swap(mx2[son],tmp);
}
ans=max(ans,mx1[son].x+mx2[son].x);
}
void nadji(int son, int par, int d)
{
naj=min(naj,max(d,mx1[son].x));
for(pii nxt:g[son])
{
if(nxt.x==par) continue;
int dub2=nxt.y+max(d,(nxt.x==mx1[son].y)?mx2[son].x:mx1[son].x);
nadji(nxt.x,son,dub2);
}
}
int travelTime(int N, int M, int L, int A[], int B[], int T[])
{
for(int i=0;i<M;i++)
{
g[A[i]].push_back({B[i],T[i]});
g[B[i]].push_back({A[i],T[i]});
}
vector<int> rad;
for(int i=0;i<N;i++)
{
if(!vis[i])
{
dfs(i,-1);
naj=1e9+7;
nadji(i,-1,0);
rad.push_back(naj);
}
}
sort(rad.rbegin(),rad.rend());
if(rad.size()>=2) ans=max(ans,rad[0]+rad[1]+L);
if(rad.size()>=3) ans=max(ans,rad[1]+rad[2]+2*L);
return ans;
}
Compilation message
/tmp/ccVf974k.o: In function `main':
grader.c:(.text.startup+0xa2): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status
