Submission #1197412

#	Time	Username	Problem	Language	Result	Execution time	Memory
1197412		44100	경주 (Race) (IOI11_race)	C++20	Compilation error	0 ms	0 KiB

race

#include <bits/stdc++.h>
#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define pub push_back
#define fi first
#define se second
using namespace std;
typedef long long ll;
const int MaxN=2e5+5,MaxK=1e6+5;
int N,K,ans,timer=1;
int sz[MaxN],del[MaxN],ach[MaxK],min_e[MaxK];
vector<pair<int,int>> adj[MaxN];
void DFS(int u,int pre)
{
    int i,j;
    sz[u]=1;
    for(auto x:adj[u])
    {
        int v=x.fi;
        if(v!=pre && !del[v])
        {
            DFS(v,u);
            sz[u]+=sz[v];
        }
    }
}
int Cen(int u,int pre,int Size)
{
    for(auto x:adj[u])
    {
        int v=x.fi;
        if(v!=pre && sz[v]>Size/2 && !del[v])
            return Cen(v,u,Size);
    }
    return u;
}
void calc(int u,int pre,int dist,int edges,bool check)
{
    if(dist>K) return;
    if(check)
    {
        if(ach[dist]!=timer || edges<min_e[dist])
        {
            ach[dist]=timer;
            min_e[dist]=edges;
        }
    }
    else
    {
        if(dist<=K && ach[K-dist]==timer)
        {
            int Sum_e=edges+min_e[K-dist];
            if(ans==-1 || Sum_e<ans)
                ans=Sum_e;
        }
        if(dist==K)
        {
            if(ans==-1 || edges<ans)
                ans=edges;
        }
    }
    for(auto x:adj[u])
    {
        int v=x.fi;
        int w=x.se;
        if(v!=pre && !del[v])
            calc(v,u,dist+w,edges+1,check);
    }
}
void Dec(int u)
{
    DFS(u,-1);
    int cen,i,j,k,v,w;
    cen=Cen(u,0,sz[u]);
    del[cen]=1;
    ++timer;
    ach[0]=timer;
    min_e[0]=0;
    for(auto x:adj[cen])
    {
        v=x.fi;
        w=x.se;
        if(!del[v])
        {
            calc(v,cen,w,1,0);
            calc(v,cen,w,1,1);
        }
    }
    for(auto x:adj[cen])
    {
        v=x.fi;
        if(!del[v])
            Dec(v);
    }
}
int best_path(int N,int K,int H[][2],int L[])
{
    ans=-1;
    memset(del,0,sizeof(del));
    int i,j;
    for(i=0;i<N;++i) adj[i].clear();
    for(i=0;i<N-1;++i)
    {
        adj[H[i][0]].pub({H[i][1],L[i]});
        adj[H[i][1]].pub({H[i][0],L[i]});
    }
    Dec(0);
    return ans;
}
int main()
{
    ios_base::sync_with_stdio(0);
    int i,j,res;
    scanf("%d%d",&N,&K);
    int H[MaxN][2],L[MaxN];
    for(i=0;i<N-1;++i)
        scanf("%d%d%d",&H[i][0],&H[i][1],&L[i]);
    res=best_path(N,K,H,L);
    printf("%d",res);
    return 0;
}

Compilation message (stderr)

race.cpp: In function 'int main()':
race.cpp:113:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  113 |     scanf("%d%d",&N,&K);
      |     ~~~~~^~~~~~~~~~~~~~
race.cpp:116:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  116 |         scanf("%d%d%d",&H[i][0],&H[i][1],&L[i]);
      |         ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/bin/ld: /tmp/ccDOdqN8.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccqWjQZn.o:race.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status