#include "bits/stdc++.h"
#include "dreaming.h"
// #include "chrono"
#define int long long
using namespace std;
// using namespace std::chrono;
// #pragma GCC target ("avx2")
// #pragma GCC optimization ("O3")
// #pragma GCC optimization ("unroll-loops")
// #pragma optimization_level 3
// #pragma GCC optimize("Ofast,no-stack-protector,unroll-loops,fast-math,O3")
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
#define pb push_back
#define galen_colin {ios_base::sync_with_stdio(false);}
#define orz {cin.tie(NULL); cout.tie(NULL);}
#define fix(prec) {cout << setprecision(prec) << fixed;}
#define mp make_pair
#define f first
#define s second
#define all(v) v.begin(), v.end()
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<pii> vpi;
typedef vector<pll> vpl;
typedef vector<vi> vvi;
typedef vector<vl> vvl;
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v);
template<typename A, typename B> ostream& operator<<(ostream &cout, pair<A, B> const &p) { return cout << "(" << p.f << ", " << p.s << ")"; }
template<typename A> ostream& operator<<(ostream &cout, vector<A> const &v) {
cout << ""; for(int i = 0; i < v.size(); i++) {if (i) cout << " "; cout << v[i];} return cout << "\n";
}
template<typename A, typename B> istream& operator>>(istream& cin, pair<A, B> &p) {
cin >> p.first;
return cin >> p.second;
}
template<typename A> istream& operator>>(istream& cin, vector<A> &v) {
for(auto &x:v)cin>>x;
return cin;
}
ll min(ll a, int b){return min(a, (ll) b);}
ll min(int a, ll b){return min(b, (ll) a);}
ll max(ll a, int b){return max(a, (ll) b);}
ll max(int a, ll b){return max(b, (ll) a);}
void usaco(string filename) {
// #pragma message("be careful, freopen may be wrong")
freopen((filename + ".in").c_str(), "r", stdin);
freopen((filename + ".out").c_str(), "w", stdout);
}
const ld pi = 3.14159265358979323846;
const ll mod = 1000000007;
// const ll mod = 998244353;
// ll mod;
const ll INF = 1e9+7;
ll n, m, k, q, l, r, x, y, z;
const ll sz = 1e5 + 1;
string s, t;
ll ans = 0, gc = 0;
vector<pair<int,int>> far;
vector<int> full, half;
vpi adj[sz];
vi path, vis(sz);
void getccs(int no, int dep){
vis[no]=1;
if(dep>far[gc].second){
far[gc]=make_pair(no,dep);
}
for(auto i:adj[no]){
if(!vis[i.f]){
getccs(i.f,dep+i.s);
}
}
}
//the max.....in this cc
//if sum > anything else up till now, but say there are only two edges we can't do better ig
int binary_searc(vi& v){
int halfdiff = v.back()/2;
int l=0, r = v.size()-1;
int ret = v.back();
while(l<=r){
int m = (l+r)/2;
if(max(v.back() - v[m], v[m]) < ret){
ret = max(v.back() - v[m], v[m]);
}
if(v[m] - halfdiff <= 0){
l = m+1;
} else {
r = m-1;
}
}
return ret;
}
void farfar(int no, int dep){
vis[no]=1;
path.push_back(dep);
full[gc] = max(full[gc], path.back());
half[gc] = max(half[gc], binary_searc(path));
for(auto i:adj[no]){
if(!vis[i.f]){
farfar(i.f, dep + i.s);
}
}
path.pop_back();
}
int travelTime(int N, int M, int L, int A[], int B[], int T[]) {
for(int i=0;i<M;i++){
adj[A[i]].pb({B[i], T[i]});
adj[B[i]].pb({A[i], T[i]});
}
n = N;
for(int i=0;i<n;i++){
if(!vis[i]){
far.push_back(make_pair(-1,-1));
getccs(i,0);
gc++;
}
}
gc=0;
vis.clear();
vis.resize(sz, 0);
for(int i=0;i<far.size();i++){
full.pb(0), half.pb(0);
farfar(far[i].first, 0);
gc++;
}
sort(all(full));
sort(all(half));
ans = full.back();
if(half.size() >= 2)
ans = max(ans, half[half.size()-1] + half[half.size()-2] + L);
return ans;
}
// int main() {
// int N,M,L;
// cin>>N>>M>>L;
// int A[M], B[M], T[M];
// for(int i=0;i<M;i++)cin>>A[i]>>B[i]>>T[i];
// cout<< travelTime(N, M, L, A, B, T);
// }
/*
12 8 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:51:4: error: redefinition of 'll min(long long int, ll)'
51 | ll min(int a, ll b){return min(b, (ll) a);}
| ^~~
dreaming.cpp:50:4: note: 'll min(ll, long long int)' previously defined here
50 | ll min(ll a, int b){return min(a, (ll) b);}
| ^~~
dreaming.cpp:53:4: error: redefinition of 'll max(long long int, ll)'
53 | ll max(int a, ll b){return max(b, (ll) a);}
| ^~~
dreaming.cpp:52:4: note: 'll max(ll, long long int)' previously defined here
52 | ll max(ll a, int b){return max(a, (ll) b);}
| ^~~
dreaming.cpp: In function 'long long int travelTime(long long int, long long int, long long int, long long int*, long long int*, long long int*)':
dreaming.cpp:150:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::pair<long long int, long long int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
150 | for(int i=0;i<far.size();i++){
| ~^~~~~~~~~~~
dreaming.cpp: In function 'void usaco(std::string)':
dreaming.cpp:57:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
57 | freopen((filename + ".in").c_str(), "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
dreaming.cpp:58:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
58 | freopen((filename + ".out").c_str(), "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
