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  1. import java.util.HashMap;
  2. import java.util.Map;
  3.  
  4. /* The class name doesn't have to be Main, as long as the class is not public. */
  5. class Main
  6. {
  7.   public static void main (String[] args) throws java.lang.Exception
  8.   {
  9.     Map<Integer, Integer> maxMap = new HashMap<Integer, Integer>();
  10.     int[][] pairs = {
  11.     		{ 1, 2 },
  12.     		{ 1, 4 },
  13.     		{ 1, 3 },
  14.     		{ 2, 2 },
  15.     		{ 2, 5 }
  16.     };
  17.     // Calculate max value for each itemid
  18.     for (int i = 0; i < pairs.length; i++) {
  19.     	int[] pair = pairs[i];
  20.     	Integer currentMax = maxMap.get(pair[0]);
  21.     	if (currentMax == null) {
  22.     		currentMax = Integer.MIN_VALUE;
  23.     	}
  24.     	maxMap.put(pair[0], Math.max(pair[1], currentMax));
  25.     }
  26.     // Print them
  27.     for (Integer itemId : maxMap.keySet()) {
  28.     	System.out.printf("%d %d\n", itemId, maxMap.get(itemId)); 
  29.     }
  30.   }
  31. }
Success #stdin #stdout 0.03s 245632KB
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https://ideone.com/rM5uA
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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