Algo-Trian

Algorithm/Bit/P12141 [蓝桥杯 2025 省 A] 假红黑树.cpp

@@ -0,0 +1,28 @@
+#include <iostream>
+#include <vector>
+using namespace std;
+int checkbin(long long s){
+	int js = 0;
+	while(s){
+		js += (s & 1);
+		s = s>> 1;
+	}
+	return js;
+}
+int main(){
+	int n;
+	cin >> n;
+	vector<long long> s(n);
+	for(int i = 0; i < n; i++){
+		int a, b;
+		cin >> a >> b;
+		s[i] = ( 1 << (a - 1) ) + (b - 1);
+	}
+	for(int i = 0; i < n; i++){
+		if(checkbin(s[i]) % 2 == 0)	cout << "BLACK" << endl;
+		else cout << "RED" << endl; 
+	}
+	return 0;
+} 
+
+

Algorithm/Bit/全排列.cpp

@@ -0,0 +1,35 @@
+#include <iostream>
+#include <vector>
+#include <iomanip> 
+using namespace std;
+vector<vector<int>> result;
+void dfs(vector<int>& path, vector<bool>& used, int n){
+	int js = 0;
+	for(int i = 0; i < n; i++){
+		if(used[i] == false){
+			js++;
+			used[i] = true;
+			path.push_back(i);
+			dfs(path, used, n);
+			path.pop_back();
+			used[i] = false;
+		}
+	}
+	if(js == 0){
+		result.push_back(path);
+		return;
+	}
+}
+int main(){
+	int n;
+	cin >> n;
+	vector<int> path;
+	vector<bool> used(n, false);
+	dfs(path, used, n);
+	for(auto x : result){
+		for(auto y: x){
+			cout << setw(5) << y + 1;
+		} 
+		cout << endl;
+	}
+}