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Commite338d1d

Browse files
add a solution for 735
1 parentb82c7f8 commite338d1d

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2 files changed

+49
-5
lines changed

2 files changed

+49
-5
lines changed

‎src/main/java/com/fishercoder/solutions/_735.java

Lines changed: 43 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -1,11 +1,12 @@
11
packagecom.fishercoder.solutions;
22

3-
importjava.util.Stack;
3+
importjava.util.Deque;
4+
importjava.util.LinkedList;
45

56
publicclass_735 {
67
publicstaticclassSolution1 {
78
publicint[]asteroidCollision(int[]asteroids) {
8-
Stack<Integer>stack =newStack();
9+
Deque<Integer>stack =newLinkedList<>();
910
for (inti =0;i <asteroids.length;i++) {
1011
if (!stack.isEmpty() &&stack.peek() >0 &&asteroids[i] <0) {
1112
if (Math.abs(stack.peek()) <Math.abs(asteroids[i])) {
@@ -27,7 +28,7 @@ public int[] asteroidCollision(int[] asteroids) {
2728
returnresult;
2829
}
2930

30-
privatevoidcollide(Stack<Integer>stack) {
31+
privatevoidcollide(Deque<Integer>stack) {
3132
do {
3233
Integertop =stack.pop();
3334
if (!stack.isEmpty() &&stack.peek() *top <0) {
@@ -47,4 +48,43 @@ private void collide(Stack<Integer> stack) {
4748
}while (!stack.isEmpty());
4849
}
4950
}
51+
52+
publicstaticclassSolution2 {
53+
/**
54+
* My completely original solution on 11/5/2021.
55+
*/
56+
publicint[]asteroidCollision(int[]asteroids) {
57+
Deque<Integer>stack =newLinkedList<>();
58+
for (inta :asteroids) {
59+
if (a >0) {
60+
stack.addLast(a);
61+
}else {
62+
if (!stack.isEmpty() &&stack.peekLast() >0) {
63+
if (stack.peekLast() >Math.abs(a)) {
64+
continue;
65+
}elseif (stack.peekLast() ==Math.abs(a)) {
66+
stack.pollLast();
67+
}else {
68+
while (!stack.isEmpty() &&stack.peekLast() >0 &&stack.peekLast() <Math.abs(a)) {
69+
stack.pollLast();
70+
}
71+
if (!stack.isEmpty() &&stack.peekLast() >0 &&stack.peekLast() ==Math.abs(a)) {
72+
stack.pollLast();
73+
continue;
74+
}elseif (stack.isEmpty() ||stack.peekLast() <0) {
75+
stack.addLast(a);
76+
}
77+
}
78+
}else {
79+
stack.addLast(a);
80+
}
81+
}
82+
}
83+
int[]ans =newint[stack.size()];
84+
for (inti =stack.size() -1;i >=0;i--) {
85+
ans[i] =stack.pollLast();
86+
}
87+
returnans;
88+
}
89+
}
5090
}

‎src/test/java/com/fishercoder/_735Test.java

Lines changed: 6 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -8,18 +8,22 @@
88

99
publicclass_735Test {
1010
privatestatic_735.Solution1solution1;
11+
privatestatic_735.Solution2solution2;
1112
privatestaticint[]asteroids;
13+
privatestaticint[]expected;
1214

1315
@BeforeClass
1416
publicstaticvoidsetup() {
1517
solution1 =new_735.Solution1();
18+
solution2 =new_735.Solution2();
1619
}
1720

1821
@Test
1922
publicvoidtest1() {
2023
asteroids =newint[]{5,10, -5};
21-
asteroids =solution1.asteroidCollision(asteroids);
22-
assertArrayEquals(newint[]{5,10},asteroids);
24+
expected =newint[]{5,10};
25+
assertArrayEquals(expected,solution1.asteroidCollision(asteroids));
26+
assertArrayEquals(expected,solution2.asteroidCollision(asteroids));
2327
}
2428

2529
@Test

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