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Commit2793ac5

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add a solution for 376
1 parente475ab6 commit2793ac5

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2 files changed

+96
-70
lines changed

2 files changed

+96
-70
lines changed

‎src/main/java/com/fishercoder/solutions/_376.java

Lines changed: 27 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -3,6 +3,32 @@
33
publicclass_376 {
44

55
publicstaticclassSolution1 {
6+
/**
7+
* credit: https://leetcode.com/problems/wiggle-subsequence/discuss/84843/Easy-understanding-DP-solution-with-O(n)-Java-version
8+
*/
9+
publicintwiggleMaxLength(int[]nums) {
10+
intlen =nums.length;
11+
int[]up =newint[len];
12+
int[]down =newint[len];
13+
up[0] =1;
14+
down[0] =1;
15+
for (inti =1;i <len;i++) {
16+
if (nums[i] >nums[i -1]) {
17+
up[i] =down[i -1] +1;
18+
down[i] =down[i -1];
19+
}elseif (nums[i] <nums[i -1]) {
20+
down[i] =up[i -1] +1;
21+
up[i] =up[i -1];
22+
}else {
23+
up[i] =up[i -1];
24+
down[i] =down[i -1];
25+
}
26+
}
27+
returnMath.max(down[len -1],up[len -1]);
28+
}
29+
}
30+
31+
publicstaticclassSolution2 {
632
publicintwiggleMaxLength(int[]nums) {
733
if (nums.length <2) {
834
returnnums.length;
@@ -12,7 +38,7 @@ public int wiggleMaxLength(int[] nums) {
1238
for (inti =2;i <nums.length;i++) {
1339
intdiff =nums[i] -nums[i -1];
1440
/**ATTN: prevDiff could be zero. e.g. [3,3,3,2,5]
15-
* but diff needs to exactly greater than zero*/
41+
* but diff needs tobeexactly greater than zero*/
1642
if ((prevDiff <=0 &&diff >0) || (prevDiff >=0) &&diff <0) {
1743
count++;
1844
prevDiff =diff;

‎src/test/java/com/fishercoder/_376Test.java

Lines changed: 69 additions & 69 deletions
Original file line numberDiff line numberDiff line change
@@ -7,80 +7,80 @@
77
importstaticorg.junit.Assert.assertEquals;
88

99
publicclass_376Test {
10-
privatestatic_376.Solution1solution1;
11-
privatestaticint[]nums;
10+
privatestatic_376.Solution1solution1;
11+
privatestaticint[]nums;
1212

13-
@BeforeClass
14-
publicstaticvoidsetup() {
15-
solution1 =new_376.Solution1();
16-
}
13+
@BeforeClass
14+
publicstaticvoidsetup() {
15+
solution1 =new_376.Solution1();
16+
}
1717

18-
@Test
19-
publicvoidtest1() {
20-
nums =newint[]{1,7,4,9,2,5};
21-
assertEquals(6,solution1.wiggleMaxLength(nums));
22-
}
18+
@Test
19+
publicvoidtest1() {
20+
nums =newint[]{1,7,4,9,2,5};
21+
assertEquals(6,solution1.wiggleMaxLength(nums));
22+
}
2323

24-
@Test
25-
publicvoidtest2() {
26-
nums =newint[]{1,17,5,10,13,15,10,5,16,8};
27-
assertEquals(7,solution1.wiggleMaxLength(nums));
28-
}
24+
@Test
25+
publicvoidtest2() {
26+
nums =newint[]{1,17,5,10,13,15,10,5,16,8};
27+
assertEquals(7,solution1.wiggleMaxLength(nums));
28+
}
2929

30-
@Test
31-
publicvoidtest3() {
32-
nums =newint[]{1,2,3,4,5,6,7,8,9};
33-
assertEquals(2,solution1.wiggleMaxLength(nums));
34-
}
30+
@Test
31+
publicvoidtest3() {
32+
nums =newint[]{1,2,3,4,5,6,7,8,9};
33+
assertEquals(2,solution1.wiggleMaxLength(nums));
34+
}
3535

36-
@Test
37-
publicvoidtest4() {
38-
nums =
39-
newint[]{33,53,12,64,50,41,45,21,97,35,47,92,39,0,93,55,40,46,69,42,6,
40-
95,51,68,72,9,32,84,34,64,6,2,26,98,3,43,30,60,3,68,82,9,97,19,
41-
27,98,99,4,30,96,37,9,78,43,64,4,65,30,84,90,87,64,18,50,60,1,40,
42-
32,48,50,76,100,57,29,63,53,46,57,93,98,42,80,82,9,41,55,69,84,82,
43-
79,30,79,18,97,67,23,52,38,74,15};
44-
assertEquals(67,solution1.wiggleMaxLength(nums));
45-
}
36+
@Test
37+
publicvoidtest4() {
38+
nums =
39+
newint[]{33,53,12,64,50,41,45,21,97,35,47,92,39,0,93,55,40,46,69,42,6,
40+
95,51,68,72,9,32,84,34,64,6,2,26,98,3,43,30,60,3,68,82,9,97,19,
41+
27,98,99,4,30,96,37,9,78,43,64,4,65,30,84,90,87,64,18,50,60,1,40,
42+
32,48,50,76,100,57,29,63,53,46,57,93,98,42,80,82,9,41,55,69,84,82,
43+
79,30,79,18,97,67,23,52,38,74,15};
44+
assertEquals(67,solution1.wiggleMaxLength(nums));
45+
}
4646

47-
@Test
48-
publicvoidtest5() {
49-
nums =newint[]{3,3,3,2,5};
50-
assertEquals(3,solution1.wiggleMaxLength(nums));
51-
}
47+
@Test
48+
publicvoidtest5() {
49+
nums =newint[]{3,3,3,2,5};
50+
assertEquals(3,solution1.wiggleMaxLength(nums));
51+
}
5252

53-
@Test
54-
publicvoidtest6() {
55-
nums =
56-
newint[]{372,492,288,399,81,2,320,94,416,469,427,117,265,357,399,456,496,
57-
337,355,219,475,295,457,350,490,470,281,127,131,36,430,412,442,174,128,
58-
253,1,56,306,295,340,73,253,130,259,223,14,79,409,384,209,151,317,441,
59-
156,275,140,224,128,250,290,191,161,472,477,125,470,230,321,5,311,23,
60-
27,248,138,284,215,356,320,194,434,136,221,273,450,440,28,179,36,386,
61-
482,203,24,8,391,21,500,484,135,348,292,396,145,443,406,61,212,480,
62-
455,78,309,318,84,474,209,225,177,356,227,263,181,476,478,151,494,395,
63-
23,114,395,429,450,247,245,150,354,230,100,172,454,155,189,33,290,187,
64-
443,123,59,358,241,141,39,196,491,381,157,157,134,431,295,20,123,118,
65-
207,199,317,188,267,335,315,308,115,321,56,52,253,492,97,374,398,272,
66-
74,206,109,172,471,55,452,452,329,367,372,252,99,62,122,287,320,325,
67-
307,481,316,378,87,97,457,21,312,249,354,286,196,43,170,500,265,253,
68-
19,480,438,113,473,247,257,33,395,456,246,310,469,408,112,385,53,449,
69-
117,122,210,286,149,20,364,372,71,26,155,292,16,72,384,160,79,241,346,
70-
230,15,427,96,95,59,151,325,490,223,131,81,294,18,70,171,339,14,40,
71-
463,421,355,123,408,357,202,235,390,344,198,98,361,434,174,216,197,274,
72-
231,85,494,57,136,258,134,441,477,456,318,155,138,461,65,426,162,90,
73-
342,284,374,204,464,9,280,391,491,231,298,284,82,417,355,356,207,367,
74-
262,244,283,489,477,143,495,472,372,447,322,399,239,450,168,202,89,333,
75-
276,199,416,490,494,488,137,327,113,189,430,320,197,120,71,262,31,295,
76-
218,74,238,169,489,308,300,260,397,308,328,267,419,84,357,486,289,312,
77-
230,64,468,227,268,28,243,267,254,153,407,399,346,385,77,297,273,484,
78-
366,482,491,368,221,423,107,272,98,309,426,181,320,77,185,382,478,398,
79-
476,22,328,450,299,211,285,62,344,484,395,466,291,487,301,407,28,295,
80-
36,429,99,462,240,124,261,387,30,362,161,156,184,188,99,377,392,442,
81-
300,98,285,312,312,365,415,367,105,81,378,413,43,326,490,320,266,390,
82-
53,327,75,332,454,29,370,392,360,1,335,355,344,120,417,455,93,60,256,
83-
451,188,161,388,338,238,26,275,340,109,185};
84-
assertEquals(334,solution1.wiggleMaxLength(nums));
85-
}
53+
@Test
54+
publicvoidtest6() {
55+
nums =
56+
newint[]{372,492,288,399,81,2,320,94,416,469,427,117,265,357,399,456,496,
57+
337,355,219,475,295,457,350,490,470,281,127,131,36,430,412,442,174,128,
58+
253,1,56,306,295,340,73,253,130,259,223,14,79,409,384,209,151,317,441,
59+
156,275,140,224,128,250,290,191,161,472,477,125,470,230,321,5,311,23,
60+
27,248,138,284,215,356,320,194,434,136,221,273,450,440,28,179,36,386,
61+
482,203,24,8,391,21,500,484,135,348,292,396,145,443,406,61,212,480,
62+
455,78,309,318,84,474,209,225,177,356,227,263,181,476,478,151,494,395,
63+
23,114,395,429,450,247,245,150,354,230,100,172,454,155,189,33,290,187,
64+
443,123,59,358,241,141,39,196,491,381,157,157,134,431,295,20,123,118,
65+
207,199,317,188,267,335,315,308,115,321,56,52,253,492,97,374,398,272,
66+
74,206,109,172,471,55,452,452,329,367,372,252,99,62,122,287,320,325,
67+
307,481,316,378,87,97,457,21,312,249,354,286,196,43,170,500,265,253,
68+
19,480,438,113,473,247,257,33,395,456,246,310,469,408,112,385,53,449,
69+
117,122,210,286,149,20,364,372,71,26,155,292,16,72,384,160,79,241,346,
70+
230,15,427,96,95,59,151,325,490,223,131,81,294,18,70,171,339,14,40,
71+
463,421,355,123,408,357,202,235,390,344,198,98,361,434,174,216,197,274,
72+
231,85,494,57,136,258,134,441,477,456,318,155,138,461,65,426,162,90,
73+
342,284,374,204,464,9,280,391,491,231,298,284,82,417,355,356,207,367,
74+
262,244,283,489,477,143,495,472,372,447,322,399,239,450,168,202,89,333,
75+
276,199,416,490,494,488,137,327,113,189,430,320,197,120,71,262,31,295,
76+
218,74,238,169,489,308,300,260,397,308,328,267,419,84,357,486,289,312,
77+
230,64,468,227,268,28,243,267,254,153,407,399,346,385,77,297,273,484,
78+
366,482,491,368,221,423,107,272,98,309,426,181,320,77,185,382,478,398,
79+
476,22,328,450,299,211,285,62,344,484,395,466,291,487,301,407,28,295,
80+
36,429,99,462,240,124,261,387,30,362,161,156,184,188,99,377,392,442,
81+
300,98,285,312,312,365,415,367,105,81,378,413,43,326,490,320,266,390,
82+
53,327,75,332,454,29,370,392,360,1,335,355,344,120,417,455,93,60,256,
83+
451,188,161,388,338,238,26,275,340,109,185};
84+
assertEquals(334,solution1.wiggleMaxLength(nums));
85+
}
8686
}

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