Bouncing BallYou are given an array 𝐴A of length 𝑁N, where each element represents either empty ground (𝐴𝑖=0A i =0) or a wall (a positive integer indicating the height of the wall).You can place a ball on any empty ground (that is, choose an index 𝑖i with 𝐴𝑖=0A i =0) and push it either to the right or to the left.When the ball hits a wall, it decreases the height of the wall it hit by 11, and then bounces back in the opposite direction. If the wall's height reaches 00, it becomes empty ground.The ball continues to move until it goes out of bounds.Determine the number of ways to place and push the ball so that all walls are destroyed. Two ways are considered different if either the starting index of the ball or the direction of the push is different.Input FormatThe first line contains a single integer 𝑇T, denoting the number of test cases.Each test case consists of two lines of input.The first line of each test case contains a single integer 𝑁N, denoting the size of the array 𝐴A.The second line of each test case contains 𝑁N space-separated integers 𝐴1,𝐴2,…,𝐴𝑁A 1 ,A 2 ,…,A N .𝐴𝑖=0A i =0 means the 𝑖i-th position is empty ground, and 𝐴𝑖>0A i >0 denotes a wall of height 𝐴𝑖A i at position 𝑖i.Output FormatFor each test case, print on a new line a single integer representing the number of ways all walls can be destroyed.Constraints1≤𝑇≤1041≤T≤10 4 3≤𝑁≤1053≤N≤10 5 0≤𝐴𝑖≤1090≤A i ≤10 9 The sum of 𝑁N over all test cases won't exceed 2⋅1052⋅10 5 .Sample 1:InputOutput441 0 0 251 1 0 1 152 4 0 5 031000 0 9992211Explanation:Test case 11: The ball can be placed at position 22 or 33 and pushed to the right.The ball hits the wall at position 44, making its height 11. It then bounces to the left direction.The ball hits the wall at position 11, making its height 00. It then bounces in th
Question
Bouncing BallYou are given an array 𝐴A of length 𝑁N, where each element represents either empty ground (𝐴𝑖=0A i =0) or a wall (a positive integer indicating the height of the wall).You can place a ball on any empty ground (that is, choose an index 𝑖i with 𝐴𝑖=0A i =0) and push it either to the right or to the left.When the ball hits a wall, it decreases the height of the wall it hit by 11, and then bounces back in the opposite direction. If the wall's height reaches 00, it becomes empty ground.The ball continues to move until it goes out of bounds.Determine the number of ways to place and push the ball so that all walls are destroyed. Two ways are considered different if either the starting index of the ball or the direction of the push is different.Input FormatThe first line contains a single integer 𝑇T, denoting the number of test cases.Each test case consists of two lines of input.The first line of each test case contains a single integer 𝑁N, denoting the size of the array 𝐴A.The second line of each test case contains 𝑁N space-separated integers 𝐴1,𝐴2,…,𝐴𝑁A 1 ,A 2 ,…,A N .𝐴𝑖=0A i =0 means the 𝑖i-th position is empty ground, and 𝐴𝑖>0A i >0 denotes a wall of height 𝐴𝑖A i at position 𝑖i.Output FormatFor each test case, print on a new line a single integer representing the number of ways all walls can be destroyed.Constraints1≤𝑇≤1041≤T≤10 4 3≤𝑁≤1053≤N≤10 5 0≤𝐴𝑖≤1090≤A i ≤10 9 The sum of 𝑁N over all test cases won't exceed 2⋅1052⋅10 5 .Sample 1:InputOutput441 0 0 251 1 0 1 152 4 0 5 031000 0 9992211Explanation:Test case 11: The ball can be placed at position 22 or 33 and pushed to the right.The ball hits the wall at position 44, making its height 11. It then bounces to the left direction.The ball hits the wall at position 11, making its height 00. It then bounces in th
Solution
This problem is a dynamic programming problem. Here are the steps to solve it:
- Initialize a variable
totalto 0
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