Submission #1088073

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
1088073	2024-09-13T19:30:25 Z	quan606303	Race (IOI11_race)	C++14	Compilation error	0 ms	0 KB

race

///0-0 : what is your motivation, quan606303?
///quan606303 : Hutao
/*idea : 
 
 
 
*/
#include <bits/stdc++.h>
#define int long long
#define ll long long
#define INTMAX INT_MAX
#define INTMIN INT_MIN
#define LONGMAX LLONG_MAX
#define LONGMIN LLONG_MIN
#define fi first
#define se second
#define memfull(a,b) memset(a,b,sizeof(a));
#define endl '\n'
#define file(a) freopen(a".inp","r",stdin); freopen(a".out","w",stdout);
using namespace std;
const int MOD=1e9+7;
const int maxn=2e5+7;
const int maxk=1e6+7;
int n,k,del[maxn],child[maxn];
vector<pair<int,int> > adj[maxn];
int ans=1e15,cnt[maxk];
const int inf=1e15;
void dfs(int u,int p)
{
    child[u]=1;
    for (auto v:adj[u])
    {
        if (v.fi!=p&&!del[v.fi])
        {
            dfs(v.fi,u);
            child[u]+=child[v.fi];
        }
    }
}
int find_centroid(int u,int p,int N)
{
    for (auto v:adj[u])
    {
        if (v.fi!=p&&!del[v.fi]&&child[v.fi]>N/2)
        {
            return find_centroid(v.fi,u,N);
        }
    }
    return u;
}
int mxdis=0;
void cal(int u,int p,bool filling,int distance,int depth)
{
    if (distance>k)return ;
    mxdis=max(mxdis,distance);
    if (filling)cnt[distance]=min(cnt[distance],depth);
    else 
    {
        ans=min(ans,cnt[k-distance]+depth);
       // cout<<u<<" "<<distance<<" "<<depth<<" "<<cnt[k-distance]<<endl;
    }
    for (auto v:adj[u])
    {
        if (!del[v.fi]&&v.fi!=p)cal(v.fi,u,filling,distance+v.se,depth+1);
    }
}
void solve(int u)
{
    dfs(u,0);
    int N=child[u];
    int root=find_centroid(u,0,N);
  //  for (int i=1;i<=n;i++)cout<<child[i]<<endl;
    del[root]=true;
    
    mxdis=0;
    for (auto v:adj[root])
    {
        if (!del[v.fi])
        {
           // cout<<v.fi<<" "<<root<<" "<<v.se<<" "<<1<<endl;
            cal(v.fi,root,false,v.se,1);
            cal(v.fi,root,true,v.se,1);
        }
    }
    fill(cnt+1,cnt+1+mxdis,inf);
    for (auto v:adj[root])
    {
        if (!del[v.fi])solve(v.fi);
    }
 
}
int32_t best_path(int N, int K, int H[][2], int L[]){
  //  file("");
    n=N;
 	 k=K;
    for (int i=1;i<n;i++)
    {
        int x = H[i][0];
        int y = H[i][1];
        int w = L[i];
        x++;
        y++;
        adj[x].push_back({y,w});
        adj[y].push_back({x,w});
    }
    for (int i=1;i<maxk;i++)cnt[i]=inf;
    solve(1);
    if (ans==inf)return -1;
    else return ans;
 
}

Compilation message

/usr/bin/ld: /tmp/ccp1ZD13.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