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Commitb4f97ed

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add a solution for 560
1 parentf7f94b2 commitb4f97ed

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2 files changed

+75
-3
lines changed

2 files changed

+75
-3
lines changed

‎src/main/java/com/fishercoder/solutions/_560.java

Lines changed: 26 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -32,4 +32,30 @@ public int subarraySum(int[] nums, int k) {
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}
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}
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publicstaticclassSolution2 {
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/**
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* My completely original solution on 10/14/2021.
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* Again, using a pen and paper to visualize your thought process just clears out all ambiguities.
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*/
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publicintsubarraySum(int[]nums,intk) {
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intans =0;
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int[]prefixSum =newint[nums.length];
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prefixSum[0] =nums[0];
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for (inti =1;i <nums.length;i++) {
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prefixSum[i] =prefixSum[i -1] +nums[i];
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}
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for (inti =0;i <nums.length;i++) {
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if (prefixSum[i] ==k) {
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ans++;
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}
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for (intj =0;j <i;j++) {
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if (prefixSum[i] -prefixSum[j] ==k) {
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ans++;
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}
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}
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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/_560Test.java

Lines changed: 49 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -6,11 +6,9 @@
66

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importstaticorg.junit.Assert.assertEquals;
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9-
/**
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* Created by fishercoder on 4/29/17.
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*/
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publicclass_560Test {
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privatestatic_560.Solution1solution1;
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privatestatic_560.Solution2solution2;
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privatestaticintexpected;
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privatestaticintactual;
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privatestaticint[]nums;
@@ -19,6 +17,7 @@ public class _560Test {
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@BeforeClass
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publicstaticvoidsetup() {
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solution1 =new_560.Solution1();
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solution2 =new_560.Solution2();
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}
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@Test
@@ -28,5 +27,52 @@ public void test1() {
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expected =2;
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actual =solution1.subarraySum(nums,k);
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assertEquals(expected,actual);
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actual =solution2.subarraySum(nums,k);
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assertEquals(expected,actual);
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}
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@Test
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publicvoidtest2() {
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nums =newint[]{1,2,3};
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k =3;
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expected =2;
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actual =solution1.subarraySum(nums,k);
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assertEquals(expected,actual);
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actual =solution2.subarraySum(nums,k);
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assertEquals(expected,actual);
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}
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@Test
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publicvoidtest3() {
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nums =newint[]{1,1};
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k =1;
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expected =2;
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actual =solution1.subarraySum(nums,k);
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assertEquals(expected,actual);
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actual =solution2.subarraySum(nums,k);
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assertEquals(expected,actual);
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}
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@Test
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publicvoidtest4() {
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nums =newint[]{0,0};
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k =0;
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expected =3;
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actual =solution1.subarraySum(nums,k);
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assertEquals(expected,actual);
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actual =solution2.subarraySum(nums,k);
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assertEquals(expected,actual);
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}
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@Test
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publicvoidtest5() {
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nums =newint[]{100,1,2,3,4};
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k =3;
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expected =2;
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actual =solution1.subarraySum(nums,k);
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assertEquals(expected,actual);
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actual =solution2.subarraySum(nums,k);
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assertEquals(expected,actual);
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}
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}

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