message: Update detect-cycles-in-2d-grid.cpp
diff: @@ -74,8 +74,8 @@ public:
  if (!grid[i][j]) {
  continue;
  }
  - vector<pair<int, int>> q = {{i, j}};
  char val = grid[i][j];
  + vector<pair<int, int>> q = {{i, j}};
  while (!q.empty()) {
  vector<pair<int, int>> new_q;
  for (const auto& [r, c] : q) {
  