Submission #17573

#	Time	Username	Problem	Language	Result	Execution time	Memory
17573		dohyun0324	전압 (JOI14_voltage)	C++98	100 / 100	143 ms	16236 KiB

voltage

#include<stdio.h>
#include<vector>
using namespace std;
vector<int>con[100010];
int cnt,n,m,ch[100010],lev[100010],arr2[100010],arr[100010],dap,ch2[100010];
void dfs(int x,int bef)
{
    int i,sw=0;
    ch[x]=1;
    for(i=0;i<con[x].size();i++){
        if(con[x][i]==bef && sw==0){sw=1; continue;}
        if(ch[con[x][i]]){
            if(lev[x]<lev[con[x][i]]) continue;
            if((lev[x]-lev[con[x][i]])%2==1) arr[x]++, arr[con[x][i]]--;
            else arr2[x]++, arr2[con[x][i]]--, cnt++;
            continue;
        }
        lev[con[x][i]]=lev[x]+1;
        dfs(con[x][i],x);
    }
}
void dfs2(int x,int bef)
{
    int i,sw=0;
    ch2[x]=1;
    for(i=0;i<con[x].size();i++){
        if(con[x][i]==bef && sw==0){sw=1; continue;}
        if(ch2[con[x][i]]) continue;
        dfs2(con[x][i],x);
        arr[x]+=arr[con[x][i]];
        arr2[x]+=arr2[con[x][i]];
    }
}
int main()
{
    int i,x,y;
    scanf("%d %d",&n,&m);
    for(i=1;i<=m;i++){
        scanf("%d %d",&x,&y);
        con[x].push_back(y); con[y].push_back(x);
    }
    for(i=1;i<=n;i++)
    {
        if(ch[i]) continue;
        dfs(i,0);
        dfs2(i,0);
        ch[i]=2;
    }
    for(i=1;i<=n;i++)
    {
        if(arr2[i]==cnt && arr[i]==0 && ch[i]==1) dap++;
    }
    if(cnt==1) dap++;
    printf("%d",dap);
    return 0;
}

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 35 / 35
• Subtask 4: 45 / 45