#include <bits/stdc++.h>
#pragma GCC optimize("O3")
typedef long long ll;
#define FOR(i,x,y) for(ll i=x; i<y; i++)
#define FORNEG(i,x,y) for(ll i=x; i>y; i--)
#define double long double
using namespace std;
ll cc[100005];
ll find(ll a){
while (a!=cc[a]) cc[a] = cc[cc[a]], a = cc[a];
return a;
}
void unite(ll a,ll b){
cc[find(a)] = find(b);
}
ll globalmax = -1;
vector<pair<ll, ll>> edges[100005];
vector<ll> sussies[100005];
int sus(vector<ll> a){
if (a.size()==1) return 0;
bool visited[100005];
FOR(i,0,100004) visited[i] = 0;
vector<vector<ll>> stack;
ll maxi = 0;
vector<ll> path;
stack.push_back({0,a[0]});
visited[a[0]] = 1;
while (stack.size()){
vector<ll> temp;
vector<ll> node = stack[stack.size()-1];
stack.pop_back();
if (maxi < node[0]) path = node, maxi = node[0];
for (auto&i : edges[node[node.size()-1]]){
if (!visited[i.first]){
visited[i.first] = 1;
temp = node;
temp[0] += i.second;
temp.push_back(i.first);
stack.push_back(temp);
}
}
}
ll realsus = path[path.size()-1];
FOR(i,0,100004) visited[i] = 0;
stack.clear();
maxi = 0;
path.clear();
stack.push_back({0,0,realsus});
visited[realsus] = 1;
while (stack.size()){
vector<ll> temp;
vector<ll> node = stack[stack.size()-1];
stack.pop_back();
if (maxi < node[0]) path = node, maxi = node[0];
for (auto&i : edges[node[node.size()-1]]){
if (!visited[i.first]){
visited[i.first] = 1;
temp = node;
temp.pop_back();
temp[0] += i.second;
temp.push_back(i.second);
temp.push_back(i.first);
stack.push_back(temp);
}
}
}
ll mini = 1000000000000;
ll cur = 0;
globalmax = max(globalmax, path[0]);
FOR(i,1,path.size()-1){
cur += path[i];
mini = min(mini, max(path[0]-cur, cur));
}
return mini;
}
int travelTime(int n, int m, int L, int a[], int b[], int t[]){
FOR(i,0,n) cc[i] = i;
FOR(i,0,m){
edges[a[i]].push_back({b[i], t[i]});
edges[b[i]].push_back({a[i], t[i]});
}
FOR(i,0,n){
for (auto&j : edges[i]){
unite(i, j.first);
}
}
FOR(i,0,n){
sussies[find(i)].push_back(i);
}
vector<ll> kindasus;
for (auto&i : sussies){
if (i.size()==0) continue;
kindasus.push_back(sus(i));
}
sort(kindasus.begin(), kindasus.end());
// for (auto&i : kindasus){
// cout << i << endl;
// }
if (kindasus.size() == 1) return 0;
if (kindasus.size()==2){
return max(globalmax, kindasus[kindasus.size()-1] + kindasus[kindasus.size()-2] + L);
}
return max(globalmax, max(kindasus[kindasus.size()-2] + kindasus[kindasus.size()-3] + 2*L, kindasus[kindasus.size()-1] + kindasus[kindasus.size()-2] + L));
}
int main(){
int a,b,c;
cin>> a >> b >> c;
int d[b], e[b], f[b];
FOR(i,0,b){
cin >> d[i] >> e[i] >>f[i];
}
cout << travelTime(a,b,c,d,e,f);
}
Compilation message
dreaming.cpp: In function 'int sus(std::vector<long long int>)':
dreaming.cpp:4:33: warning: comparison of integer expressions of different signedness: 'll' {aka 'long long int'} and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
4 | #define FOR(i,x,y) for(ll i=x; i<y; i++)
......
104 | FOR(i,1,path.size()-1){
| ~~~~~~~~~~~~~~~~~
dreaming.cpp:104:2: note: in expansion of macro 'FOR'
104 | FOR(i,1,path.size()-1){
| ^~~
/usr/bin/ld: /tmp/ccsnYJw9.o: in function `main':
dreaming.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/cc3lJZ16.o:grader.c:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/cc3lJZ16.o: in function `main':
grader.c:(.text.startup+0xd1): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status
