add: 220615-CN

cpp/2206/220615-CN.cpp

@@ -0,0 +1,31 @@
+#include <vector>
+#include <algorithm>
+
+/**
+ * 719. Find K-th Smallest Pair Distance
+ * The distance of a pair of integers a and b is defined as the absolute difference between a and b.
+ * Given an integer array nums and an integer k, return the kth smallest distance among all the pairs nums[i] and nums[j] where 0 <= i < j < nums.length.
+ */
+
+class Solution {
+public:
+	static int smallestDistancePair(std::vector<int>& nums, int k) {
+		const int n = nums.size();
+		std::sort(nums.begin(), nums.end());
+		int L = 0, R = nums.back();
+		while (L < R) {
+			int M = (L + R) >> 1;
+			int i = 0, c = 0;
+			for (int j = 0; j < n; ++j) {
+				while (nums[j] - nums[i] > M)
+					++i;
+				c += j - i;
+			}
+			if (c >= k)
+				R = M;
+			else
+				L = M + 1;
+		}
+		return L;
+	}
+};

cpp/2206/CMakeLists.txt

@@ -3,4 +3,4 @@ PROJECT(2206)
 
 SET(CMAKE_CXX_STANDARD 23)
 
-ADD_EXECUTABLE(2206 220615.cpp)
+ADD_EXECUTABLE(2206 220615-CN.cpp)