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Commit02c14f6

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add a solution for 34
1 parent9dc51ae commit02c14f6

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2 files changed

+52
-0
lines changed

2 files changed

+52
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lines changed

‎src/main/java/com/fishercoder/solutions/_34.java

Lines changed: 48 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -85,4 +85,52 @@ public int[] searchRange(int[] nums, int target) {
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returnresult;
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}
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}
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publicstaticclassSolution3 {
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/**
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* My completely original solution on 1/15/2022. A great practice to solidify binary search basics.
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*/
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publicint[]searchRange(int[]nums,inttarget) {
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intleft =0;
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intright =nums.length -1;
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int[]ans =newint[]{-1, -1};
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while (left <right) {
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intmid =left + (right -left) /2;
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if (nums[mid] >target) {
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right =mid -1;
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}elseif (nums[mid] <target) {
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left =mid +1;
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}else {
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right =mid -1;
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ans[0] =mid;
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ans[1] =mid;
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}
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}
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if (left <nums.length &&nums[left] !=target &&right >0 &&nums[right] !=target &&right +1 <nums.length &&nums[right +1] !=target) {
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returnans;
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}
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if (left <nums.length &&nums[left] ==target) {
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ans[0] =left;
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ans[1] =left;
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}
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right =nums.length -1;
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while (left <right) {
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intmid =left + (right -left) /2;
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if (nums[mid] <target) {
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left =mid +1;
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}elseif (nums[mid] >target) {
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right =mid -1;
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}else {
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ans[1] =mid;
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left =mid +1;
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}
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}
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if (right >=0 &&nums[right] ==target) {
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ans[1] =right;
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}elseif (left <nums.length &&nums[left] ==target) {
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ans[1] =left;
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}
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returnans;
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}
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}
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}

‎src/test/java/com/fishercoder/_34Test.java

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -9,25 +9,29 @@
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publicclass_34Test {
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privatestatic_34.Solution1solution1;
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privatestatic_34.Solution2solution2;
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privatestatic_34.Solution3solution3;
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privatestaticint[]nums;
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_34.Solution1();
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solution2 =new_34.Solution2();
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solution3 =new_34.Solution3();
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}
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@Test
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publicvoidtest1() {
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nums =newint[]{1,2,3};
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assertArrayEquals(newint[]{1,1},solution1.searchRange(nums,2));
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assertArrayEquals(newint[]{1,1},solution2.searchRange(nums,2));
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assertArrayEquals(newint[]{1,1},solution3.searchRange(nums,2));
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}
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@Test
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publicvoidtest2() {
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nums =newint[]{};
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assertArrayEquals(newint[]{-1, -1},solution1.searchRange(nums,0));
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assertArrayEquals(newint[]{-1, -1},solution2.searchRange(nums,0));
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assertArrayEquals(newint[]{-1, -1},solution3.searchRange(nums,0));
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}
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}

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