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Commite3c7c87

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add a solution for 11
1 parentc850dc9 commite3c7c87

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2 files changed

+35
-10
lines changed

2 files changed

+35
-10
lines changed

‎src/main/java/com/fishercoder/solutions/_11.java

Lines changed: 29 additions & 9 deletions
Original file line numberDiff line numberDiff line change
@@ -2,18 +2,38 @@
22

33
publicclass_11 {
44
publicstaticclassSolution1 {
5+
/**
6+
* Time: O(n^2)
7+
* This brute force solution is NOT accepted on LeetCode due to TLE.
8+
*/
9+
publicintmaxArea(int[]height) {
10+
intmaxArea =0;
11+
for (intleft =0;left <height.length -1;left++) {
12+
for (intright =height.length -1;left <right;right--) {
13+
intarea = (right -left) *Math.min(height[left],height[right]);
14+
maxArea =Math.max(maxArea,area);
15+
}
16+
}
17+
returnmaxArea;
18+
}
19+
}
20+
21+
publicstaticclassSolution2 {
22+
/**
23+
* Two pointer technique.
24+
* Well explained here: https://leetcode.com/problems/container-with-most-water/discuss/6100/Simple-and-clear-proofexplanation
25+
*/
526
publicintmaxArea(int[]height) {
627
intmax =0;
7-
inti =0;
8-
intj =height.length -1;
9-
while (i <j) {
10-
max =Math.max(Math.min(height[i],height[j]) * (j -i),max);
11-
if (height[i] <=height[j]) {
12-
// we need to find the shorter one,
13-
// then calculate its area
14-
i++;
28+
intleft =0;
29+
intright =height.length -1;
30+
while (left <right) {
31+
max =Math.max(Math.min(height[left],height[right]) * (right -left),max);
32+
if (height[left] <=height[right]) {
33+
/**if this height is shorter, then we'll need to move it to the right to find a higher one so that it's possible to find a larger area.*/
34+
left++;
1535
}else {
16-
j--;
36+
right--;
1737
}
1838
}
1939
returnmax;

‎src/test/java/com/fishercoder/_11Test.java

Lines changed: 6 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -8,17 +8,22 @@
88

99
publicclass_11Test {
1010
privatestatic_11.Solution1solution1;
11+
privatestatic_11.Solution2solution2;
1112
privatestaticint[]height;
13+
privatestaticintexpected;
1214

1315
@BeforeClass
1416
publicstaticvoidsetup() {
1517
solution1 =new_11.Solution1();
18+
solution2 =new_11.Solution2();
1619
}
1720

1821
@Test
1922
publicvoidtest1() {
2023
height =newint[]{1,1};
21-
assertEquals(1,solution1.maxArea(height));
24+
expected =1;
25+
assertEquals(expected,solution1.maxArea(height));
26+
assertEquals(expected,solution2.maxArea(height));
2227
}
2328

2429
}

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