msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
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add q42

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pull/6/head
yuanguangxin 5 years ago
parent f2064cbc45
commit a3277ce348
2 changed files with 77 additions and 43 deletions
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93
.idea/workspace.xml
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@ -2,9 +2,8 @@
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@ -79,13 +78,13 @@
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<option name="MAIN_CLASS_NAME" value="q98.f3.Solution" />
<module name="LeetCode" />
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<pattern>
<option name="PATTERN" value="etc.tree.traversal.*" />
<option name="PATTERN" value="q98.f3.*" />
<option name="ENABLED" value="true" />
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@ -93,12 +92,12 @@
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q98.f3.Solution" />
<configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q110.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q98.f3.*" />
<option name="PATTERN" value="q110.*" />
<option name="ENABLED" value="true" />
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@ -106,12 +105,12 @@
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Solution (2)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q110.Solution" />
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<option name="MAIN_CLASS_NAME" value="q1277.Solution" />
<module name="LeetCode" />
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@ -119,12 +118,12 @@
<option name="Make" enabled="true" />
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<configuration name="Solution (3)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q1277.Solution" />
<configuration name="Solution (4)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q42.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q1277.*" />
<option name="PATTERN" value="q42.*" />
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@ -173,11 +172,11 @@
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@ -318,7 +317,14 @@
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@ -339,7 +345,8 @@
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<MESSAGE value="update q98" />
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27
src/q42/Solution.java
Unescape View File

@ -0,0 +1,27 @@
package q42;
/**
* 暴力法o(n^2) 找出每个元素（柱子）上面的水量，可提前存储最大高度数组（两个左和右），最后遍历一次优化为o(n)
*/
public class Solution {
public int trap(int[] height) {
int ans = 0;
int size = height.length;
for (int i = 1; i < size - 1; i++) {
int maxLeft = 0, maxRight = 0;
for (int j = i; j >= 0; j--) {
maxLeft = Math.max(maxLeft, height[j]);
}
for (int j = i; j < size; j++) {
maxRight = Math.max(maxRight, height[j]);
}
ans += Math.min(maxLeft, maxRight) - height[i];
}
return ans;
}
public static void main(String[] args) {
new Solution().trap(new int[]{0, 1, 0, 2, 1, 0, 1, 3, 2, 1, 2, 1});
}
}
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