add: 220531 [cpp]

cpp/2205/220531.cpp

@@ -0,0 +1,33 @@
+#include <string>
+#include <bitset>
+
+/**
+ * 1461. Check If a String Contains All Binary Codes of Size K
+ * Given a binary string s and an integer k, return true if every binary code of length k is a substring of s. Otherwise, return false.
+ */
+
+class Solution {
+public:
+	static bool hasAllCodes(const std::string& s, int k) {
+		if (s.length() <= k)
+			return false;
+		int cur = 0, cnt = 1, mask = (1 << k) - 1;
+		for (int i = 0; i < k; ++i)
+			cur = (cur << 1) | (s[i] & 1);
+		std::bitset<1 << 20> v;
+		v.set(cur);
+		for (int r = k; r < s.length(); ++r) {
+			cur = ((cur << 1) | (s[r] & 1)) & mask;
+			if (!v.test(cur)) {
+				v.set(cur);
+				++cnt;
+			}
+		}
+		return cnt == (1 << k);
+	}
+};
+
+int main() {
+	Solution::hasAllCodes("01", 1);
+	return 0;
+}

cpp/2205/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2205)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2205 220531-CN.cpp)
+ADD_EXECUTABLE(2205 220531.cpp)