#include<cstdio>
#include<vector>
#include<algorithm>
using namespace std;
int bae[100001][2];
vector<int> lnk[100001];
vector<int> gili[100001];
vector<int> gap[100001];
int lnp[100001];
bool check[100001]={0};
vector<int> cc;
int tm=0;
int mn=2100000000;
int dfs1(int nw){
int i;
check[nw]=true;
for(i=0;i<lnp[nw];i++){
if(check[lnk[nw][i]]) continue;
gap[nw][i]=dfs1(lnk[nw][i])+gili[nw][i];
if(bae[nw][0]<gap[nw][i]){
bae[nw][1]=bae[nw][0];
bae[nw][0]=gap[nw][i];
}else if(bae[nw][1]<gap[nw][i]){
bae[nw][1]=gap[nw][i];
}
}
return bae[nw][0];
}
void dfs2(int nw,int prevhead){
int i;
check[nw]=true;
mn=min(mn,max(prevhead,bae[nw][0]));
for(i=0;i<lnp[nw];i++){
if(check[lnk[nw][i]]) continue;
if(bae[nw][0]==gap[nw][i]){
dfs2(lnk[nw][i],max(bae[nw][1],prevhead)+gili[nw][i]);
}else{
dfs2(lnk[nw][i],max(bae[nw][0],prevhead)+gili[nw][i]);
}
}
}
int main(){
int i,n,m,l,ia,ib,ic;
scanf("%d %d %d",&n,&m,&l);
for(i=0;i<m;i++){
scanf("%d %d %d",&ia,&ib,&ic);
lnk[ia].push_back(ib);
gili[ia].push_back(ic);
lnk[ib].push_back(ia);
gili[ib].push_back(ic);
gap[ia].push_back(0);
gap[ib].push_back(0);
lnp[ia]++;lnp[ib]++;
}
for(i=0;i<n;i++){
if(check[i]) continue;
dfs1(i);
}
for(i=0;i<n;i++){
check[i]=false;
}
for(i=0;i<n;i++){
if(check[i]) continue;
mn=2100000000;
dfs2(i,0);
cc.push_back(-mn);
//printf("%d\n",mn);
tm++;
}
if(tm==1){
printf("%d",-cc[0]);
}else if(tm==2){
printf("%d",-cc[0]-cc[1]+l);
}else{
sort(cc.begin(),cc.end());
cc[0]=-cc[0];cc[1]=-cc[1];cc[2]=-cc[2];
printf("%d",max(cc[0]+cc[1]+l,max(cc[0]+cc[2]+l,cc[1]+cc[2]+l*2)));
}
}
Compilation message
dreaming.cpp: In function 'int main()':
dreaming.cpp:48:7: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d",&n,&m,&l);
~~~~~^~~~~~~~~~~~~~~~~~~~~
dreaming.cpp:50:8: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
scanf("%d %d %d",&ia,&ib,&ic);
~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/tmp/cceZLVS4.o: In function `main':
dreaming.cpp:(.text.startup+0x0): multiple definition of `main'
/tmp/cc7lI1yG.o:grader.c:(.text.startup+0x0): first defined here
/tmp/cc7lI1yG.o: In function `main':
grader.c:(.text.startup+0xa2): undefined reference to `travelTime'
collect2: error: ld returned 1 exit status
