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Commit0459666

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refactor 398
1 parent9703a71 commit0459666

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1 file changed

+7
-35
lines changed
  • src/main/java/com/fishercoder/solutions

1 file changed

+7
-35
lines changed
Lines changed: 7 additions & 35 deletions
Original file line numberDiff line numberDiff line change
@@ -1,11 +1,13 @@
11
packagecom.fishercoder.solutions;
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importjava.util.ArrayList;
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importjava.util.HashMap;
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importjava.util.List;
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importjava.util.Map;
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/**Given an array of integers with possible duplicates, randomly output the index of a given target number. You can assume that the given target number must exist in the array.
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/**
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* 398. Random Pick Index
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*
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* Given an array of integers with possible duplicates,
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* randomly output the index of a given target number. You can assume that the given target number must exist in the array.
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Note:
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The array size can be very large. Solution that uses too much extra space will not pass the judge.
@@ -22,9 +24,9 @@
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solution.pick(1);*/
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publicclass_398 {
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//TODO: use reservoir sampling to solve it again
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//TODO: use reservoir sampling to solve it again
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classSolution {
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publicstaticclassSolution {
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//brute force
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int[]input;
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java.util.Randomrand =newjava.util.Random();
@@ -47,34 +49,4 @@ public int pick(int target) {
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returnlist.get(randomIndex);
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}
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}
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classSolutionMemoryLimitExceeded {
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privateMap<Integer,List<Integer>>map =newHashMap();
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java.util.Randomrand =newjava.util.Random();
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publicSolutionMemoryLimitExceeded(int[]nums) {
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for (inti =0;i <nums.length;i++) {
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if (map.containsKey(nums[i])) {
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List<Integer>list =map.get(nums[i]);
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list.add(i);
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map.put(nums[i],list);
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}else {
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List<Integer>list =newArrayList();
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list.add(i);
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map.put(nums[i],list);
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}
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}
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}
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publicintpick(inttarget) {
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List<Integer>list =map.get(target);
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if (list.size() ==1) {
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returnlist.get(0);
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}
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intrandomIndex =rand.nextInt(list.size());
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returnlist.get(randomIndex);
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}
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}
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}

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