Rain Water Trapping

Problem Statement

Input Format

First line contains N. Second line contains N elevation heights.

Output Format

Print the total trapped water units.

Constraints

1 <= N <= 1000

Sample Input

12
0 1 0 2 1 0 1 3 2 1 2 1

Sample Output

6

Explanation

Elevation map traps 6 units of water.

Starter Code

#include <stdio.h>

int main() {
    int n;
    if (scanf("%d", &n) == 1) {
        int arr[n];
        for (int i = 0; i < n; i++) scanf("%d", &arr[i]);
        // Write your code here
    }
    return 0;
}

Limits

• Time Limit: 1s
• Memory Limit: 256MB