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Commita113b6d

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committed
238 (3) add some comments
1 parent13cd026 commita113b6d

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4 files changed

+40
-14
lines changed

4 files changed

+40
-14
lines changed

‎src/_238_ProductOfArrayExceptSelf/Solution.java

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -26,7 +26,9 @@
2626
/** see test {@link _238_ProductOfArrayExceptSelf.SolutionTest } */
2727
publicclassSolution {
2828

29-
// cache product of left subarray
29+
// res[i] = A[i - 1] * B[i + 1]
30+
// where A[i - 1] = nums[0] * nums[1] * .. * nums[i - 1]
31+
// B[i + 1] = nums[i + 1] * nums[i + 2] * .. nums[len - 1]
3032
publicint[]productExceptSelf(int[]nums) {
3133
intn =nums.length;
3234
int[]res =newint[n];

‎test/_238_ProductOfArrayExceptSelf/PracticeTest.java

Lines changed: 12 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -28,17 +28,25 @@ public void tearDown() throws Exception {
2828

2929
@Test
3030
publicvoidTest1() {
31-
int[]nums = {1,2,3,4};
31+
int[]nums = {1,2,3,4};
3232
int[]actuals =solution.productExceptSelf(nums);
33-
int[]expecteds =newint[]{24,12,8,6};
33+
int[]expecteds ={24,12,8,6};
3434
assertArrayEquals(expecteds,actuals);
3535
}
3636

3737
@Test
3838
publicvoidTest2() {
39-
int[]nums = {1,2};
39+
int[]nums = {1,2};
4040
int[]actuals =solution.productExceptSelf(nums);
41-
int[]expecteds =newint[]{2,1};
41+
int[]expecteds = {2,1 };
42+
assertArrayEquals(expecteds,actuals);
43+
}
44+
45+
@Test
46+
publicvoidTest3() {
47+
int[]nums = {6 };
48+
int[]actuals =solution.productExceptSelf(nums);
49+
int[]expecteds = {1 };
4250
assertArrayEquals(expecteds,actuals);
4351
}
4452

‎test/_238_ProductOfArrayExceptSelf/SolutionLinearSpaceTest.java

Lines changed: 12 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -28,17 +28,25 @@ public void tearDown() throws Exception {
2828

2929
@Test
3030
publicvoidTest1() {
31-
int[]nums = {1,2,3,4};
31+
int[]nums = {1,2,3,4};
3232
int[]actuals =solution.productExceptSelf(nums);
33-
int[]expecteds =newint[]{24,12,8,6};
33+
int[]expecteds ={24,12,8,6};
3434
assertArrayEquals(expecteds,actuals);
3535
}
3636

3737
@Test
3838
publicvoidTest2() {
39-
int[]nums = {1,2};
39+
int[]nums = {1,2};
4040
int[]actuals =solution.productExceptSelf(nums);
41-
int[]expecteds =newint[]{2,1};
41+
int[]expecteds = {2,1 };
42+
assertArrayEquals(expecteds,actuals);
43+
}
44+
45+
@Test
46+
publicvoidTest3() {
47+
int[]nums = {6 };
48+
int[]actuals =solution.productExceptSelf(nums);
49+
int[]expecteds = {1 };
4250
assertArrayEquals(expecteds,actuals);
4351
}
4452

‎test/_238_ProductOfArrayExceptSelf/SolutionTest.java

Lines changed: 13 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -9,7 +9,7 @@
99
importorg.junit.rules.Timeout;
1010

1111
publicclassSolutionTest {
12-
12+
1313
/** Test method for {@link _238_ProductOfArrayExceptSelf.Solution } */
1414
Solutionsolution;
1515

@@ -28,17 +28,25 @@ public void tearDown() throws Exception {
2828

2929
@Test
3030
publicvoidTest1() {
31-
int[]nums = {1,2,3,4};
31+
int[]nums = {1,2,3,4};
3232
int[]actuals =solution.productExceptSelf(nums);
33-
int[]expecteds =newint[]{24,12,8,6};
33+
int[]expecteds ={24,12,8,6};
3434
assertArrayEquals(expecteds,actuals);
3535
}
3636

3737
@Test
3838
publicvoidTest2() {
39-
int[]nums = {1,2};
39+
int[]nums = {1,2 };
40+
int[]actuals =solution.productExceptSelf(nums);
41+
int[]expecteds = {2,1 };
42+
assertArrayEquals(expecteds,actuals);
43+
}
44+
45+
@Test
46+
publicvoidTest3() {
47+
int[]nums = {6 };
4048
int[]actuals =solution.productExceptSelf(nums);
41-
int[]expecteds =newint[]{2,1};
49+
int[]expecteds ={1};
4250
assertArrayEquals(expecteds,actuals);
4351
}
4452

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