Method set_value

code/other/algorithm_x.cpp:17–18

    rep(i,0,rows)
      arr[i] = new bool[cols], memset(arr[i], 0, cols); }
  void set_value(int row, int col, bool val = true) {
    arr[row][col] = val; }
  void setup() {
    node ***ptr = new node**[rows + 1];
    rep(i,0,rows+1) {