#include<bits/stdc++.h>
#include"dreaming.h"
#define maxn 100005
using namespace std;
int dist[maxn][3],marc[maxn][3];
vector<int> grafo[maxn],peso[maxn],cc[maxn],raios;
void dfs(int v,int k,int id){
marc[v][id]=k;
for(int i=0;i<grafo[v].size();i++){
int viz=grafo[v][i];
int p=peso[v][i];
if(marc[viz][id]==0){
dist[viz][id]=dist[v][id]+p;
dfs(viz,k,id);
}
}
}
int travelTime(int N,int M,int L,int A[],int B[],int T[]){
int k=1;
for(int i=0;i<M;i++){
grafo[A[i]].push_back(B[i]);
peso[A[i]].push_back(T[i]);
grafo[B[i]].push_back(A[i]);
peso[B[i]].push_back(T[i]);
}
for(int i=0;i<N;i++){
if(marc[i][0]==0){
dist[i][0]=0;
dfs(i,k,0);
k++;
}
cc[marc[i][0]].push_back(i);
}
for(int i=1;i<k;i++){
//////////////////////////////////ACHAR a
int a=cc[i][0];
for(int j=0;j<cc[i].size();j++){
int prox=cc[i][j];
if(dist[prox][0]>dist[a][0]) a=prox;
}
dist[a][1]=0;
dfs(a,i,1);
/////////////////////////////////ACHAR b
int b=a;
for(int j=0;j<cc[i].size();j++){
int prox=cc[i][j];
if(dist[prox][1]>dist[b][1]) b=prox;
}
dist[b][2]=0;
dfs(b,i,2);
////////////////////////////////ACHAR O MAIOR RAIO
int d=dist[b][1],r=d;
for(int j=0;j<cc[i].size();j++){
int cur=cc[i][j];
int r1=dist[cur][1],r2=dist[cur][2];
if(r1+r2==d) r=min(r,max(r1,r2));
}
///////////////////////////////ACHAMOS
raios.push_back(r);
}
sort(raios.begin(),raios.end());
int tam=raios.size();
int m1=raios[tam-1],m2=raios[tam-2],m3;
if(n-m>=3){
m3=raios[tam-3];
}
else m3=-1000000000;
int resp=max(m1+m2+L,m2+m3+2*L);
for(int i=0;i<N;i++){
grafo[i].clear();
peso[i].clear();
cc[i].clear();
dist[i][0]=0;dist[i][1]=0;dist[i][2]=0;
marc[i][0]=0;marc[i][1]=0;marc[i][2]=0;
}
raios.clear();
return resp;
}
/*int main(){
int n,m,l;
scanf("%d %d %d",&n,&m,&l);
int A[maxn],B[maxn],P[maxn];
for(int i=0;i<m;i++){
int a,b,p;
scanf("%d %d %d",&a,&b,&p);
A[i]=a;
B[i]=b;
P[i]=p;
}
cout<<travelTime(n,m,l,A,B,P);
}*/
Compilation message
dreaming.cpp: In function 'void dfs(int, int, int)':
dreaming.cpp:9:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int i=0;i<grafo[v].size();i++){
~^~~~~~~~~~~~~~~~
dreaming.cpp: In function 'int travelTime(int, int, int, int*, int*, int*)':
dreaming.cpp:37:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<cc[i].size();j++){
~^~~~~~~~~~~~~
dreaming.cpp:45:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<cc[i].size();j++){
~^~~~~~~~~~~~~
dreaming.cpp:53:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
for(int j=0;j<cc[i].size();j++){
~^~~~~~~~~~~~~
dreaming.cpp:64:5: error: 'n' was not declared in this scope
if(n-m>=3){
^
dreaming.cpp:64:7: error: 'm' was not declared in this scope
if(n-m>=3){
^
dreaming.cpp:64:7: note: suggested alternative: 'm3'
if(n-m>=3){
^
m3
