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Commit768a893

Browse files
add a solution for 716
1 parent4c640c0 commit768a893

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2 files changed

+136
-73
lines changed

2 files changed

+136
-73
lines changed

‎src/main/java/com/fishercoder/solutions/_716.java

Lines changed: 58 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1,7 +1,9 @@
11
packagecom.fishercoder.solutions;
22

33
importjava.util.ArrayList;
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importjava.util.Deque;
45
importjava.util.Iterator;
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importjava.util.LinkedList;
57
importjava.util.List;
68
importjava.util.Stack;
79
importjava.util.TreeMap;
@@ -191,4 +193,60 @@ public int popMax() {
191193
}
192194
}
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}
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publicstaticclassSolution3 {
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/**
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* My completely original solution on 10/25/2021.
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* popMax() takes O(n) time, all other operations take O(1) time.
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*/
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publicstaticclassMaxStack {
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Deque<int[]>stack;
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Deque<int[]>tmp;
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publicMaxStack() {
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stack =newLinkedList<>();
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tmp =newLinkedList<>();
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}
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publicvoidpush(intx) {
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if (stack.isEmpty()) {
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stack.addLast(newint[]{x,x});
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}else {
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int[]last =stack.peekLast();
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stack.addLast(newint[]{x,Math.max(last[1],x)});
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}
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}
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publicintpop() {
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returnstack.pollLast()[0];
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}
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publicinttop() {
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returnstack.peekLast()[0];
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}
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publicintpeekMax() {
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returnstack.peekLast()[1];
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}
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publicintpopMax() {
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tmp.clear();
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while (stack.peekLast()[0] !=stack.peekLast()[1]) {
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tmp.addLast(stack.pollLast());
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}
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int[]max =stack.pollLast();
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while (!tmp.isEmpty()) {
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int[]curr =tmp.pollLast();
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if (!stack.isEmpty()) {
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stack.addLast(newint[]{curr[0],Math.max(curr[0],stack.peekLast()[1])});
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}else {
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stack.addLast(newint[]{curr[0],curr[0]});
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}
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}
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returnmax[0];
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}
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}
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}
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}

‎src/test/java/com/fishercoder/_716Test.java

Lines changed: 78 additions & 73 deletions
Original file line numberDiff line numberDiff line change
@@ -7,84 +7,89 @@
77
importstaticorg.junit.Assert.assertEquals;
88

99
publicclass_716Test {
10-
privatestatic_716.Solution1.MaxStackmaxStackSolution1;
11-
privatestatic_716.Solution2.MaxStackmaxStackSolution2;
10+
privatestatic_716.Solution1.MaxStackmaxStackSolution1;
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privatestatic_716.Solution2.MaxStackmaxStackSolution2;
12+
privatestatic_716.Solution3.MaxStackmaxStackSolution3;
1213

13-
@Before
14-
publicvoidsetup() {
15-
maxStackSolution1 =new_716.Solution1.MaxStack();
16-
maxStackSolution2 =new_716.Solution2.MaxStack();
17-
}
14+
@Before
15+
publicvoidsetup() {
16+
maxStackSolution1 =new_716.Solution1.MaxStack();
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maxStackSolution2 =new_716.Solution2.MaxStack();
18+
maxStackSolution3 =new_716.Solution3.MaxStack();
19+
}
1820

19-
@Test
20-
publicvoidtest1() {
21-
maxStackSolution1.push(5);
22-
assertEquals(5,maxStackSolution1.peekMax());
23-
assertEquals(5,maxStackSolution1.popMax());
24-
}
21+
@Test
22+
publicvoidtest1() {
23+
maxStackSolution1.push(5);
24+
assertEquals(5,maxStackSolution1.peekMax());
25+
maxStackSolution2.push(5);
26+
assertEquals(5,maxStackSolution2.popMax());
27+
maxStackSolution3.push(5);
28+
assertEquals(5,maxStackSolution3.popMax());
29+
}
2530

26-
@Test
27-
publicvoidtest2() {
28-
maxStackSolution1.push(5);
29-
maxStackSolution1.push(1);
30-
assertEquals(5,maxStackSolution1.popMax());
31-
assertEquals(1,maxStackSolution1.peekMax());
32-
}
31+
@Test
32+
publicvoidtest2() {
33+
maxStackSolution1.push(5);
34+
maxStackSolution1.push(1);
35+
assertEquals(5,maxStackSolution1.popMax());
36+
assertEquals(1,maxStackSolution1.peekMax());
37+
}
3338

34-
@Test
35-
publicvoidtest3() {
36-
maxStackSolution1.push(74);
37-
assertEquals(74,maxStackSolution1.popMax());
38-
maxStackSolution1.push(89);
39-
maxStackSolution1.push(67);
40-
assertEquals(89,maxStackSolution1.popMax());
41-
assertEquals(67,maxStackSolution1.pop());
42-
maxStackSolution1.push(61);
43-
maxStackSolution1.push(-77);
44-
assertEquals(61,maxStackSolution1.peekMax());
45-
assertEquals(61,maxStackSolution1.popMax());
46-
maxStackSolution1.push(81);
47-
assertEquals(81,maxStackSolution1.peekMax());
48-
assertEquals(81,maxStackSolution1.popMax());
49-
maxStackSolution1.push(81);
50-
assertEquals(81,maxStackSolution1.pop());
51-
maxStackSolution1.push(-71);
52-
maxStackSolution1.push(32);
53-
}
39+
@Test
40+
publicvoidtest3() {
41+
maxStackSolution1.push(74);
42+
assertEquals(74,maxStackSolution1.popMax());
43+
maxStackSolution1.push(89);
44+
maxStackSolution1.push(67);
45+
assertEquals(89,maxStackSolution1.popMax());
46+
assertEquals(67,maxStackSolution1.pop());
47+
maxStackSolution1.push(61);
48+
maxStackSolution1.push(-77);
49+
assertEquals(61,maxStackSolution1.peekMax());
50+
assertEquals(61,maxStackSolution1.popMax());
51+
maxStackSolution1.push(81);
52+
assertEquals(81,maxStackSolution1.peekMax());
53+
assertEquals(81,maxStackSolution1.popMax());
54+
maxStackSolution1.push(81);
55+
assertEquals(81,maxStackSolution1.pop());
56+
maxStackSolution1.push(-71);
57+
maxStackSolution1.push(32);
58+
}
5459

55-
@Test
56-
publicvoidtest4() {
57-
maxStackSolution2.push(5);
58-
assertEquals(5,maxStackSolution2.peekMax());
59-
assertEquals(5,maxStackSolution2.popMax());
60-
}
60+
@Test
61+
publicvoidtest4() {
62+
maxStackSolution2.push(5);
63+
assertEquals(5,maxStackSolution2.peekMax());
64+
assertEquals(5,maxStackSolution2.popMax());
65+
}
6166

62-
@Test
63-
publicvoidtest5() {
64-
maxStackSolution2.push(5);
65-
maxStackSolution2.push(1);
66-
assertEquals(5,maxStackSolution2.popMax());
67-
assertEquals(1,maxStackSolution2.peekMax());
68-
}
67+
@Test
68+
publicvoidtest5() {
69+
maxStackSolution2.push(5);
70+
maxStackSolution2.push(1);
71+
assertEquals(5,maxStackSolution2.popMax());
72+
assertEquals(1,maxStackSolution2.peekMax());
73+
}
6974

70-
@Test
71-
publicvoidtest6() {
72-
maxStackSolution2.push(74);
73-
assertEquals(74,maxStackSolution2.popMax());
74-
maxStackSolution2.push(89);
75-
maxStackSolution2.push(67);
76-
assertEquals(89,maxStackSolution2.popMax());
77-
assertEquals(67,maxStackSolution2.pop());
78-
maxStackSolution2.push(61);
79-
maxStackSolution2.push(-77);
80-
assertEquals(61,maxStackSolution2.peekMax());
81-
assertEquals(61,maxStackSolution2.popMax());
82-
maxStackSolution2.push(81);
83-
assertEquals(81,maxStackSolution2.peekMax());
84-
assertEquals(81,maxStackSolution2.popMax());
85-
maxStackSolution2.push(81);
86-
assertEquals(81,maxStackSolution2.pop());
87-
maxStackSolution2.push(-71);
88-
maxStackSolution2.push(32);
89-
}
75+
@Test
76+
publicvoidtest6() {
77+
maxStackSolution2.push(74);
78+
assertEquals(74,maxStackSolution2.popMax());
79+
maxStackSolution2.push(89);
80+
maxStackSolution2.push(67);
81+
assertEquals(89,maxStackSolution2.popMax());
82+
assertEquals(67,maxStackSolution2.pop());
83+
maxStackSolution2.push(61);
84+
maxStackSolution2.push(-77);
85+
assertEquals(61,maxStackSolution2.peekMax());
86+
assertEquals(61,maxStackSolution2.popMax());
87+
maxStackSolution2.push(81);
88+
assertEquals(81,maxStackSolution2.peekMax());
89+
assertEquals(81,maxStackSolution2.popMax());
90+
maxStackSolution2.push(81);
91+
assertEquals(81,maxStackSolution2.pop());
92+
maxStackSolution2.push(-71);
93+
maxStackSolution2.push(32);
94+
}
9095
}

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