Submission #56493

#	Time	Username	Problem	Language	Result	Execution time	Memory
56493		red1108	산만한 고양이 (KOI17_cat)	C++17	45 / 100	542 ms	263168 KiB

cat

#include <stdio.h>
#include <algorithm>
#include <vector>
typedef long long ll;
using namespace std;
vector<int> graph[300010];
int visit[300010], comp[300010],link[300010];
int n, m,vcnt;
int dfs(int now, int from)
{
    int cmp=1,ret,child=0;
    ret=visit[now]=++vcnt;
    for(auto i:graph[now])
    {
        if(i==from) continue;
        if(!visit[i])
        {
            int df;
            df=dfs(i,now);
            if(df>=visit[now]) cmp++;
            ret=min(ret,df);
            child++;
        }
        else ret=min(ret,visit[i]);
    }
    if(from==0) cmp=child;
    comp[now]=cmp;
    return ret;
}
int main()
{
    scanf("%d %d", &n, &m);
    for(int i=1;i<=m;i++)
    {
        int a, b;
        scanf("%d %d", &a, &b);
        graph[a].push_back(b);
        graph[b].push_back(a);
        link[a]++,link[b]++;
    }
    dfs(1,0);
    ll ans=0;
    for(int i=1;i<=n;i++)
    {
        if(m-link[i]==n-comp[i]-1) ans+=i;
    }
    printf("%lld", ans);
}

Compilation message (stderr)

cat.cpp: In function 'int main()':
cat.cpp:32:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d %d", &n, &m);
     ~~~~~^~~~~~~~~~~~~~~~~
cat.cpp:36:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d %d", &a, &b);
         ~~~~~^~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 10 / 10
• Subtask 3: 23 / 23
• Subtask 4: 0 / 55