Type an input and write what you think is the output . Each problem is converted to Web Assembly, so any possible input will show the corresponding output. Only correct predictions count.
Locked until you have predicted 3 outputs correctly.
| 1 | void build(int open, int close, string& current, |
| 2 | vector<string>& out) { |
| 3 | |
| 4 | if (open == 0 && close == 0) { |
| 5 | out.push_back(current); |
| 6 | return; |
| 7 | } |
| 8 | |
| 9 | if (open > 0) { |
| 10 | current.push_back('('); |
| 11 | build(open - 1, close + 1, current, out); |
| 12 | current.pop_back(); |
| 13 | } |
| 14 | |
| 15 | if (close > 0) { |
| 16 | current.push_back(')'); |
| 17 | build(open, close - 1, current, out); |
| 18 | current.pop_back(); |
| 19 | } |
| 20 | } |
| 21 | |
| 22 | vector<string> solution(int n) { |
| 23 | |
| 24 | vector<string> ans; |
| 25 | string current; |
| 26 | |
| 27 | build(n, 0, current, ans); |
| 28 | |
| 29 | return ans; |
| 30 | } |
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.