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  1.     #include <stdio.h>
  2.     #include<vector>
  3.     using namespace std;
  4.     vector<int>v[100005];//but why do you create the array size here?array size is not needed-isnt that the main advantage of vector?or is it a 2d array??
  5.     int length;
  6.     bool vis[100005];//is bool another datatype?
  7.     void dfs(int i)
  8.     {
  9.     for(int j=0;j<v[i].size();j++)//v[i].size() means??size() is a function??
  10.     {
  11.     if(!vis[v[i][j]])
  12.     {
  13.     length++;
  14.     vis[v[i][j]]=1;
  15.     dfs(v[i][j]);
  16.     }
  17.     }
  18.     }
  19.     int main()
  20.     {
  21.     int t;
  22.     scanf("%d",&t);
  23.     while(t--)
  24.     {
  25.     int x,y,n,q,count=0;
  26.     scanf("%d%d",&n,&q);
  27.     while(q--)
  28.     {
  29.     scanf("%d%d",&x,&y);
  30.     v[x-1].push_back(y-1);
  31.     v[y-1].push_back(x-1);
  32.     }
  33.     long long unsigned sum=1;
  34.     for(int i=0;i<n;i++)
  35.     {
  36.     if(!vis[i])
  37.     {
  38.     vis[i]=1;
  39.     count++;
  40.     length=1;
  41.     for(int j=0;j<v[i].size();j++)
  42.     {
  43.     if(!vis[v[i][j]])
  44.     {
  45.     vis[v[i][j]]=1;
  46.     dfs(v[i][j]);
  47.     length++;
  48.     }
  49.     }
  50.     sum*=length;
  51.     sum%=1000000007;
  52.     }
  53.     }
  54.     printf("%d %llu\n",count,sum);
  55.     for(int i=0;i<n;vis[i++]=0)
  56.     v[i].clear();
  57.     }
  58.     return 0;
  59.     }
Runtime error #stdin #stdout 0s 4120KB
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Standard input is empty
stdout
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Standard output is empty
https://ideone.com/sgpmvo
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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