Submission #5196

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
5196	2014-02-14 08:47:05	ainta	작은 사이클들 (YDX13_smallcycles)	C++98	1 / 1	76 ms	12908 KiB

E

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#include<stdio.h>
#include<algorithm>
#include<vector>
using namespace std;
vector<int>E[100010];
int n, num[100001], cnt, par[100010], res;
bool chk[100010];
void DFS(int a){
  num[a] = ++cnt;
  int i, x, c = 0;
  for (i = 0; i < E[a].size(); i++){
    if (num[E[a][i]]){
      if (E[a][i] != par[a] && num[E[a][i]] < num[a]){
        x = a;
        while (x != E[a][i]){
          chk[x] = true;
          x = par[x];
        }
      }
      continue;
    }
    par[E[a][i]] = a;
    DFS(E[a][i]);
    if (!chk[E[a][i]])c++;
  }
  res += c / 2;
  if (c % 2 == 1 && !chk[a]){
    chk[a] = true;
    res++;
  }
 
 
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