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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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public static class Solution2 {
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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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public int subarraySum(int[] nums, int k) {
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int ans = 0;
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int[] prefixSum = new int[nums.length];
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prefixSum[0] = nums[0];
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for (int i = 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 (int i = 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 (int j = 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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return ans;
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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 @@
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import static org.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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public class _560Test {
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private static _560.Solution1 solution1;
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private static _560.Solution2 solution2;
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private static int expected;
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private static int actual;
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private static int[] nums;
@@ -19,6 +17,7 @@ public class _560Test {
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@BeforeClass
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public static void setup() {
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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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public void test2() {
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nums = new int[]{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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public void test3() {
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nums = new int[]{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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public void test4() {
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nums = new int[]{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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public void test5() {
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nums = new int[]{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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