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  1. #include <iostream>
  2. using namespace std;
  3. bool findPathExistence(int ** edges,int n,int sv,int ev,bool * visited)
  4. {
  5.     if(sv == ev)
  6.         return true;
  7.     visited[sv] = true;
  8.     bool ans = false;
  9.     for(int i=0;i<n;i++)
  10.     {
  11.         if(edges[sv][i] == 1 && !visited[i])
  12.         {
  13.             ans = findPathExistence(edges,n,i,ev,visited);
  14.             if(ans)
  15.                 return ans;
  16.         }
  17.     }
  18.     return ans;
  19. }
  20. int main() {
  21.     int n, E;
  22.     cin >> n >> E;
  23.  
  24.   /*
  25.  
  26.   	   Write Your Code Here
  27. 	   Complete the Rest of the Program
  28. 	   You have to take input and print the output yourself
  29.  
  30.   */
  31.     int ** edges = new int*[n];
  32.     for(int i=0;i<n;i++)
  33.     {
  34.         edges[i] = new int[n];
  35.         for(int j=0;j<n;j++)
  36.             edges[i][j] = 0;
  37.     }
  38.     for(int i=0;i<E;i++)
  39.     {
  40.         int x,y;
  41.         cin >> x >> y;
  42.         edges[x][y] = 1;
  43.         edges[y][x] = 1;
  44.     }
  45.     bool * visited = new bool[n];
  46.     for(int i=0;i<n;i++)
  47.         visited[i] = false;
  48.     int sv,ev;
  49.     cin >> sv >> ev;
  50.     if(findPathExistence(edges,n,sv,ev,visited))
  51.         cout << "true";
  52.     else
  53.         cout << "false";
  54.     delete [] visited;
  55.     for(int i=0;i<n;i++)
  56.         delete [] edges[i];
  57.     delete [] edges;
  58.   return 0;
  59. }
  60.  
Success #stdin #stdout 0s 15232KB
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stdin
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Standard input is empty
stdout
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true
https://ideone.com/SrVtL1
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
public

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