#include <bits/stdc++.h>
using namespace std;
#define pii pair<int,int>
#define F first
#define S second
#define pb push_back
vector<pii> adj[100005];
long long f[100005];
bool vis[100005];
int n , m , l;
long long ans = 0 , maxxi , optz ;
int a = 0 , b = 0;
void solve(int x , int y , long long d){
if(d >= maxxi){
a = x , maxxi = d;
}
for(int j = 0 ; j < adj[x].size() ; j++){
pii v = adj[x][j];
if(v.F == y) continue;
solve(v.F , x , d + v.S);
}
}
void dp(int x , int y , long long d){
if(f[x] == -1){
f[x] = d;
}
else{
optz = min(optz , max(f[x] , d));
}
for(int j = 0; j < adj[x].size() ; j++){
pii v = adj[x][j];
if(v.F == y) continue;
dp(v.F , x , d + v.S);
}
}
void mark(int x , int y){
vis[x] = true;
for(int j = 0 ; j < adj[x].size() ; j++){
if(adj[x][j].F == y) continue;
mark(adj[x][j].F, x);
}
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]){
n = N , m = M , l = L;
for(int i = 0 ; i < m ; i++){
adj[A[i]].pb(pii(B[i],T[i]));
adj[B[i]].pb(pii(A[i],T[i]));
}
for(int i = 0 ; i < n; i ++){
f[i] = -1;
}
vector<long long> opt;
for(int i = 0 ; i< n; i ++){
if(!vis[i]){
a = - 1 , b = - 1 , maxxi = 0;
solve(i , i , 0);
maxxi = 0;
b = a;
solve(a , a , 0);
ans = max(ans , maxxi);
optz = (long long) 1e18;
dp(a , a , 0);
dp(b , b , 0);
// cout<<a<<" "<<b<<" "<<maxxi<<" "<<optz<<endl;
opt.push_back(optz);
mark(a , a);
}
}
sort(opt.begin() , opt.end());
if(opt.size() >= 2){
ans = max(ans , opt[opt.size() - 1] + l + opt[opt.size() - 2]);
}
if(opt.size() >= 3){
ans = max(ans , 2*l + opt[opt.size() - 2] + opt[opt.size() - 3]);
}
return ans;
}
/*
13 9 2
8 12 2
0 8 4
8 2 2
2 7 4
5 11 3
5 1 7
1 3 1
1 9 5
10 6 3
*/
Compilation message
dreaming.cpp: In function 'void solve(int, int, long long int)':
dreaming.cpp:18:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0 ; j < adj[x].size() ; j++){
~~^~~~~~~~~~~~~~~
dreaming.cpp: In function 'void dp(int, int, long long int)':
dreaming.cpp:32:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0; j < adj[x].size() ; j++){
~~^~~~~~~~~~~~~~~
dreaming.cpp: In function 'void mark(int, int)':
dreaming.cpp:41:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j = 0 ; j < adj[x].size() ; j++){
~~^~~~~~~~~~~~~~~
/tmp/cc1WhqkM.o: In function `main':
grader.c:(.text.startup+0xa2): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status
