Implement Trapped RainWater

dynamic_programming/trapped_rainwater.cpp

@@ -0,0 +1,101 @@
+/**
+ * @file
+ * @brief Implementation of the [Trapped Rainwater
+ * Problem](https://www.geeksforgeeks.org/trapping-rain-water/)
+ * @details
+ * This implementation calculates the amount of rainwater that can be trapped
+ * between walls represented by an array of heights.
+ */
+
+#include <algorithm>  /// For std::min and std::max
+#include <cassert>    /// For assert
+#include <vector>     /// For vector container
+
+/*
+ * @namespace
+ * @brief Dynamic Programming Algorithms
+ */
+namespace dynamic_programming {
+/**
+ * @brief Function to calculate the trapped rainwater
+ * @param heights Array representing the heights of walls
+ * @return The amount of trapped rainwater
+ */
+int trappedRainwater(const std::vector<int>& heights) {
+    int n = heights.size();
+    if (n <= 2)
+        return 0;  // No water can be trapped with less than 3 walls
+
+    std::vector<int> leftMax(n), rightMax(n);
+
+    // Calculate the maximum height of wall to the left of each wall
+    leftMax[0] = heights[0];
+    for (int i = 1; i < n; ++i) {
+        leftMax[i] = std::max(leftMax[i - 1], heights[i]);
+    }
+
+    // Calculate the maximum height of wall to the right of each wall
+    rightMax[n - 1] = heights[n - 1];
+    for (int i = n - 2; i >= 0; --i) {
+        rightMax[i] = std::max(rightMax[i + 1], heights[i]);
+    }
+
+    // Calculate the trapped rainwater between walls
+    int trappedWater = 0;
+    for (int i = 0; i < n; ++i) {
+        trappedWater +=
+            std::max(0, std::min(leftMax[i], rightMax[i]) - heights[i]);
+    }
+
+    return trappedWater;
+}
+
+}  // namespace dynamic_programming
+
+/**
+ * @brief Self-test implementations
+ * @returns void
+ */
+static void test() {
+    std::vector<int> test_basic = {0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1};
+    assert(dynamic_programming::trappedRainwater(test_basic) == 6);
+
+    std::vector<int> test_peak_under_water = {3, 0, 2, 0, 4};
+    assert(dynamic_programming::trappedRainwater(test_peak_under_water) == 7);
+
+    std::vector<int> test_bucket = {5, 1, 5};
+    assert(dynamic_programming::trappedRainwater(test_bucket) == 4);
+
+    std::vector<int> test_skewed_bucket = {4, 1, 5};
+    assert(dynamic_programming::trappedRainwater(test_skewed_bucket) == 3);
+
+    std::vector<int> test_empty = {};
+    assert(dynamic_programming::trappedRainwater(test_empty) == 0);
+
+    std::vector<int> test_flat = {0, 0, 0, 0, 0};
+    assert(dynamic_programming::trappedRainwater(test_flat) == 0);
+
+    std::vector<int> test_no_trapped_water = {1, 1, 2, 4, 0, 0, 0};
+    assert(dynamic_programming::trappedRainwater(test_no_trapped_water) == 0);
+
+    std::vector<int> test_single_elevation = {5};
+    assert(dynamic_programming::trappedRainwater(test_single_elevation) == 0);
+
+    std::vector<int> test_two_point_elevation = {5, 1};
+    assert(dynamic_programming::trappedRainwater(test_two_point_elevation) ==
+           0);
+
+    std::vector<int> test_large_elevation_map_difference = {5, 1, 6, 1,
+                                                            7, 1, 8};
+    assert(dynamic_programming::trappedRainwater(
+               test_large_elevation_map_difference) == 15);
+}
+
+/**
+ * @brief Main function
+ * @returns 0 on exit
+ */
+int main() {
+    test();  // run self-test implementations
+    return 0;
+}