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  1. // Program to count islands with max nodes in boolean 2D matrix
  2. #include <bits/stdc++.h>
  3. #define n 5
  4. using namespace std;
  5.  int counting=0;
  6. void dfs(int M[][n], int visited[][n], int i, int j) {
  7.   if (i >= n || i < 0) return ;
  8.  
  9.   if (j >= n || j < 0) return ;
  10.  
  11.   if (M[i][j] == 1 && visited[i][j] == 0) {
  12.   	 visited[i][j] = 1;
  13.   	counting++;
  14.  
  15.   } 
  16.   if(M[i][j] == 0)
  17.   {
  18.   	 visited[i][j] = 1;
  19. return;
  20.  
  21.   }
  22.   dfs(M, visited, i, j + 1) ; 
  23.   dfs(M, visited, i, j - 1) ;
  24.   dfs(M, visited, i - 1, j) ;
  25.   dfs(M, visited, i + 1, j);
  26. }
  27.  
  28. int main() {
  29.   int visited[n][n];
  30.   // initialize visited to 0
  31.   for (int i = 0; i < n; i++) {
  32.     for (int j = 0; j < n; j++) {
  33.       visited[i][j] = 0;
  34.     }
  35.   }
  36.  
  37.   int M[][5] = {{1, 1, 0, 0, 0},
  38.                 {0, 1, 0, 0, 1},
  39.                 {1, 0, 0, 1, 1},
  40.                 {0, 0, 0, 0, 0},
  41.                 {1, 0, 1, 0, 1}};
  42.   int max = INT_MIN;
  43.   for (int i = 0; i < 5; i++) {
  44.     for (int j = 0; j < 5; j++) {
  45.       // getting max
  46.    if(visited[i][j]==0){
  47.     counting=0;
  48.       dfs(M, visited, i, j);
  49.       if (max < counting)
  50.       max = counting;}
  51.     }
  52.   }
  53.  
  54.   cout << max << endl;
  55.   return 0;
  56. }
Runtime error #stdin #stdout 0.44s 1531904KB
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stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/NLQY6C
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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