#include using namespace std; deque split(string, char); int main(){ cin.tie(NULL); cout.tie(NULL); ios_base::sync_with_stdio(0); int T; cin >> T; for(int i = 0; i < T; i++){ bool isError = false; bool isReversed = false; int N; string P, tempNum; cin >> P >> N >> tempNum; deque nums = split(tempNum.substr(1, tempNum.size() - 2), ','); for(int j = 0; j < P.size(); j++){ if(P[j] == 'D'){ if(!nums.empty()){ if(isReversed){ nums.pop_back(); }else{ nums.pop_front(); } }else{ isError = true; break; } }else if(P[j] == 'R'){ isReversed ? isReversed = false : isReversed = true; } } if(!isError){ cout << "["; if(!nums.empty()){ while(1){ if(isReversed){ cout << nums.back(); nums.pop_back(); }else{ cout << nums.front(); nums.pop_front(); } if(nums.empty()){ break; } cout << ","; } } cout << "]"; }else{ cout << "error"; } cout << "\n"; } return 0; } deque split(string str, char cut) { deque result; istringstream ss(str); string stringBuffer; while (getline(ss, stringBuffer, cut)) { result.push_back(stringBuffer); } return result; }```

5430. AC

5430. AC