g0001_0100.s0096_unique_binary_search_trees.Solution.cpp Maven / Gradle / Ivy

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104 LeetCode algorithm problem solutions

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// #Medium #Dynamic_Programming #Math #Tree #Binary_Tree #Binary_Search_Tree
// #Dynamic_Programming_I_Day_11 #Big_O_Time_O(n)_Space_O(1)
// #2024_05_27_Time_0_ms_(100.00%)_Space_7.2_MB_(48.54%)

class Solution {
public:
    int numTrees(int n) {
        long result = 1;
        for (int i = 0; i < n; i++) {
            result *= 2L * n - i;
            result /= i + 1;
        }
        result /= n + 1;
        return static_cast(result);
    }
};