Submission #1294928

#	Time	Username	Problem	Language	Result	Execution time	Memory
1294928		maithedung	Race (IOI11_race)	C++20	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>
using namespace std;
#define int long long
#define endl '\n'
#define fast ios_base::sync_with_stdio(false), cin.tie(0), cout.tie(0)
#define exit return 0
#define cap pair<int,int>
#define fi first
#define se second
#define pb push_back
#define FOR(i,l,r) for(int i=l;i<=r;i++)
#define FOD(i,r,l) for(int i=r;i>=l;i--)
#define fill(f,x) memset(f,x,sizeof(f))
#define lcm(a,b) (a/__gcd(a,b)*b)
#define TIME 1.0 * clock() / CLOCKS_PER_SEC
int visited[1000005];
map<int,int> cnt;
int nut[1000005];
int dem=0;
int k;
vector<cap> ke[1000005];
int dp[1000005];
int heavy[1000005];
int in[1000005];
int out[1000005];
int kq=1e18;
int n;
int h[1000005];
map<int,int> flag;
void xuli(int u, int lca)
{
     if(flag[k-visited[u]+2*visited[lca]])kq=min(kq,h[u]+cnt[k-visited[u]+2*visited[lca]]-2*h[lca]);
}

void add(int u)
{
    if(!flag[visited[u]])
    {
        cnt[visited[u]]=h[u];
    }
    cnt[visited[u]]=min(cnt[visited[u]],h[u]);
    flag[visited[u]]=1;
}

void dfs(int u, int cha)
{
    int maxx=0;
    dp[u]=1;
    in[u]=(++dem);
    nut[dem]=u;
    if(u==1) h[u]=1;
    for(auto it: ke[u])
    {
        int cost=it.second;
        int v=it.first;
        if(v!=cha)
        {
            h[v]=h[u]+1;
            visited[v]=visited[u]+cost;
            dfs(v,u);
            dp[u]+=dp[v];
            if(maxx<dp[v])
            {
                maxx=dp[v];
                heavy[u]=v;
            }
        }
    }
    out[u]=dem;
}

void dfs2(int u, int cha, int keep)
{
    for(auto it: ke[u])
    {
        int v=it.first;
        if(v!=cha && v!=heavy[u])
        {
            dfs2(v,u,0);
        }
    }
    if(heavy[u]!=0) dfs2(heavy[u],u,1);
    xuli(u,u);
    add(u);
    for(auto it: ke[u])
    {
        int v=it.first;
        if(v!=cha && v!=heavy[u])
        {
            FOR(i,in[v],out[v])
            {
                xuli(nut[i],u);
            }
            FOR(i,in[v],out[v]) add(nut[i]);
        }
    }
    if(keep==0)
    {
       // kq=1e18;
      //  FOR(i,in[u],out[u]) del(nut[i]);
        flag.clear();
        cnt.clear();
    }
}
signed main()
{
    fast;
    cin>>n>>k;
    FOR(i,1,n-1)
    {
        int x,y,w;
        cin>>x>>y>>w;
        ke[x+1].push_back({y+1,w});
        ke[y+1].push_back({x+1,w});
    }
    FOR(i,1,n) cnt[visited[i]]=1e18;
    dfs(1,-1);
    dfs2(1,-1,0);
    if(kq==1e18) cout<<-1;
    else cout<<kq;
    exit;
}
/*
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*/

Compilation message (stderr)

/usr/bin/ld: /tmp/ccFKckyv.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccg63UOj.o:race.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccFKckyv.o: in function `main':
grader.cpp:(.text.startup+0x28): undefined reference to `best_path(int, int, int (*) [2], int*)'
collect2: error: ld returned 1 exit status