Submission #3798

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
3798	2013-08-31 08:25:18	cki86201	Cactus? Not cactus? (kriii1_C)	C++98	1 / 1	76 ms	12172 KiB

C

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#include<stdio.h>
#include<vector>
using namespace std;
vector<int> edge[100000];
vector<int> now;
bool check[100000]={0};
bool check_cycle[100000]={0};
bool ans=false;
int distime[100000]={0},deltime[100000]={0},time=0;
void dfs(int a,int par){
  check[a]=true;
  distime[a]=time++;
  now.push_back(a);
  int i,j;
  for(i=0;i<edge[a].size();i++){
    if(check[edge[a][i]] && edge[a][i]!=par && distime[edge[a][i]]<distime[a]){
      for(j=now.size()-1;j>=0;j--){
        if(check_cycle[now[j]]){
          ans=true;
          return;
        }
        check_cycle[now[j]]=true;
        if(now[j]==edge[a][i]) break;
      }
    }
    else if(!check[edge[a][i]]){
      dfs(edge[a][i],a);
      if(ans) return;
    }
 
 
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• Subtask 1: 1 / 1