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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10.     public static void main (String[] args) throws java.lang.Exception
  11.     {
  12.         int[] city1 = {1, 5, 4, 3, 2, 1};
  13.         int result1 = getRainVolume(city1);
  14.  
  15.         System.out.printf("city1: %d\n", result1);
  16.     }
  17.  
  18.     static int getRainVolume(int[] wallHeight)
  19.     {
  20.         int maxHeight = 0;
  21.         int maxHeightIndex = 0;
  22.         for (int i = 0; i < wallHeight.Length; i++)
  23.             if (wallHeight[i] > maxHeight)
  24.             {
  25.                 maxHeight = wallHeight[i];
  26.                 maxHeightIndex = i;
  27.             }
  28.         int airLevel = 0;
  29.         int rainCollected = 0;
  30.         for (int i = 0, curHeight; i < maxHeightIndex; i++)
  31.         {
  32.             curHeight = wallHeight[i];
  33.             if (airLevel < curHeight)
  34.                 airLevel = curHeight;
  35.             else if (airLevel > curHeight)
  36.                 rainCollected += airLevel - curHeight;
  37.         }
  38.         airLevel = 0;
  39.         for (int i = wallHeight.Length - 1, curHeight; i > maxHeightIndex; i--)
  40.         {
  41.             curHeight = wallHeight[i];
  42.             if (airLevel < curHeight)
  43.                 airLevel = curHeight;
  44.             else if (airLevel > curHeight)
  45.                 rainCollected += airLevel - curHeight;
  46.         }
  47.         return rainCollected;   
  48.     }
  49. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
Main.java:22: error: cannot find symbol
        for (int i = 0; i < wallHeight.Length; i++)
                                      ^
  symbol:   variable Length
  location: variable wallHeight of type int[]
Main.java:39: error: cannot find symbol
        for (int i = wallHeight.Length - 1, curHeight; i > maxHeightIndex; i--)
                               ^
  symbol:   variable Length
  location: variable wallHeight of type int[]
2 errors
stdout
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Standard output is empty
https://ideone.com/KKb21d
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
secret

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