Cod sursa(job #1860175)
Utilizator | Petru Trimbitas S7012MY | Data | 27 ianuarie 2017 22:05:21 |
---|---|---|---|
Problema | Diametrul unui arbore | Scor | 100 |
Compilator | cpp | Status | done |
Runda | Arhiva educationala | Marime | 0.57 kb |
#include <iostream>
#include <fstream>
#include <vector>
#define DN 100005
using namespace std;
int n,d[DN];
vector<int> gr[DN];
void _(int s,int f,int dc) {
d[s]=dc;
for(auto i:gr[s]) if(f!=i) _(i,s,dc+1);
}
int main() {
ifstream f("darb.in");
ofstream g("darb.out");
f>>n;
for(int i=1; i<n; ++i) {
int a,b; f>>a>>b;
gr[a].push_back(b);
gr[b].push_back(a);
}
_(1,0,0);
int nm=1;
for(int i=2; i<=n; ++i) if(d[i]>d[nm]) nm=i;
_(nm,0,1);
nm=1;
for(int i=2; i<=n; ++i) if(d[i]>d[nm]) nm=i;
g<<d[nm];
}