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c_cpp
a year ago
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#include "bits/stdc++.h" // @JASPER'S BOILERPLATE using namespace std; using ll = long long; #define FOR(i, a, b) for(int i = a; i <= b; i++) #define FORD(i, a, b) for(int i = a; i >= b; i--) #define REP(i, b) for(int i = 0; i < b; i++) #define PER(i, b) for(int i = b - 1; i >= 0; i--) #define fi first #define se second #ifdef JASPER2 #include "debug.h" #else #define debug(...) 166 #endif // #define int long long using pii = pair < int, int >; const int INF = 1e9; const ll MOD = 998244353; const int N = 2e5 + 5; int n; vector <string> ans; string str; bool isValid(string expr) { // Declare a stack to hold the previous brackets. stack<char> temp; for (int i = 0; i < (int) expr.length(); i++) { if (temp.empty()) { // If the stack is empty // just push the current bracket temp.push(expr[i]); } else if ((temp.top() == '(' && expr[i] == ')') || (temp.top() == '{' && expr[i] == '}') || (temp.top() == '[' && expr[i] == ']')) { // If we found any complete pair of bracket // then pop temp.pop(); } else { temp.push(expr[i]); } } if (temp.empty()) { // If stack is empty return true return true; } return false; } void solve(int i, int opn, int cls) { if (i == n) { if (isValid(str)) ans.push_back(str); return; } // Them dau ngoac mo truoc if (opn < n / 2) { for (auto x : {'(', '[', '{'}) { str.push_back(x); solve(i + 1, opn + 1, cls); str.pop_back(); } } // Them ngoac dong if (cls < opn) { for (auto x : {')', ']', '}'}) { str.push_back(x); solve(i + 1, opn, cls + 1); str.pop_back(); } } } void run_case() { cin >> n; if (n & 1) { cout << "NOT FOUND\n"; return; } solve(0, 0, 0); sort(ans.begin(), ans.end()); for (auto x : ans) cout << x << " "; } signed main() { cin.tie(0) -> sync_with_stdio(0); #ifdef JASPER2 freopen("in1", "r", stdin); #endif int Test = 1; // cin >> Test; for (int test = 1; test <= Test; test++){ run_case(); } }