Give it an input and say what you think comes back. It compiles and runs for real, so a wrong guess still shows you the answer — probe as much as you like. Only correct predictions count.
Locked until you have predicted 4 outputs correctly.
| 1 | void flood(vector<vector<char>>& grid, int r, int c) { |
| 2 | int rows = grid.size(); |
| 3 | int cols = grid[0].size(); |
| 4 | if (r < 0 || r >= rows) return; |
| 5 | if (c < 0 || c >= cols) return; |
| 6 | if (grid[r][c] != '1') return; |
| 7 | |
| 8 | grid[r][c] = '0'; |
| 9 | flood(grid, r + 1, c); |
| 10 | flood(grid, r - 1, c); |
| 11 | flood(grid, r, c + 1); |
| 12 | flood(grid, r, c - 1); |
| 13 | } |
| 14 | |
| 15 | int solution(vector<vector<char>> grid) { |
| 16 | if (grid.empty() || grid[0].empty()) return 0; |
| 17 | int rows = grid.size(); |
| 18 | int cols = grid[0].size(); |
| 19 | int found = 0; |
| 20 | for (int r = 0; r < rows; r++) { |
| 21 | for (int c = 0; c < cols; c++) { |
| 22 | if (grid[r][c] == '1') { |
| 23 | found++; |
| 24 | flood(grid, r, c); |
| 25 | } |
| 26 | } |
| 27 | } |
| 28 | return found; |
| 29 | } |
Names have been stripped. The signature is the only clue you get for free. Compiled as C++20 with the standard headers and using namespace std; already in scope.