msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
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add q53

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pull/6/head
yuanguangxin 5 years ago
parent bb5208b0cc
commit 4dfbf67583
3 changed files with 113 additions and 37 deletions
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95
.idea/workspace.xml
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@ -2,10 +2,9 @@
<project version="4"> <project version="4">
<component name="ChangeListManager"> <component name="ChangeListManager">
<list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment=""> <list default="true" id="af7ffdf2-4ddc-4ed6-8222-60ed5acbc2ed" name="Default Changelist" comment="">
<change afterPath="$PROJECT_DIR$/src/q46/Solution.java" afterDir="false" /> <change afterPath="$PROJECT_DIR$/src/q53/q1/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q46/f2/Solution.java" afterDir="false" /> <change afterPath="$PROJECT_DIR$/src/q53/q2/Solution.java" afterDir="false" />
<change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" /> <change beforePath="$PROJECT_DIR$/.idea/workspace.xml" beforeDir="false" afterPath="$PROJECT_DIR$/.idea/workspace.xml" afterDir="false" />
<change beforePath="$PROJECT_DIR$/src/q236/Solution.java" beforeDir="false" afterPath="$PROJECT_DIR$/src/q236/Solution.java" afterDir="false" />
</list> </list>
<option name="SHOW_DIALOG" value="false" /> <option name="SHOW_DIALOG" value="false" />
<option name="HIGHLIGHT_CONFLICTS" value="true" /> <option name="HIGHLIGHT_CONFLICTS" value="true" />
@ -75,7 +74,7 @@
<recent name="$PROJECT_DIR$/src/q206/f1" /> <recent name="$PROJECT_DIR$/src/q206/f1" />
</key> </key>
</component> </component>
<component name="RunManager" selected="Application.Solution (1)"> <component name="RunManager" selected="Application.Solution (5)">
<configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true"> <configuration name="Solution (1)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q46.f2.Solution" /> <option name="MAIN_CLASS_NAME" value="q46.f2.Solution" />
<module name="LeetCode" /> <module name="LeetCode" />
@ -128,12 +127,25 @@
<option name="Make" enabled="true" /> <option name="Make" enabled="true" />
</method> </method>
</configuration> </configuration>
<configuration name="Solution (5)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q53.q2.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q53.q2.*" />
<option name="ENABLED" value="true" />
</pattern>
</extension>
<method v="2">
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true"> <configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q46.f1.Solution" /> <option name="MAIN_CLASS_NAME" value="q53.q1.Solution" />
<module name="LeetCode" /> <module name="LeetCode" />
<extension name="coverage"> <extension name="coverage">
<pattern> <pattern>
<option name="PATTERN" value="q46.f1.*" /> <option name="PATTERN" value="q53.q1.*" />
<option name="ENABLED" value="true" /> <option name="ENABLED" value="true" />
</pattern> </pattern>
</extension> </extension>
@ -169,11 +181,11 @@
</configuration> </configuration>
<recent_temporary> <recent_temporary>
<list> <list>
<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (1)" /> <item itemvalue="Application.Solution (1)" />
<item itemvalue="Application.Solution (2)" /> <item itemvalue="Application.Solution (2)" />
<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (4)" /> <item itemvalue="Application.Solution (4)" />
<item itemvalue="Application.Solution (3)" />
</list> </list>
</recent_temporary> </recent_temporary>
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@ -212,7 +224,8 @@
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<workItem from="1579759214129" duration="10251000" /> <workItem from="1579759214129" duration="10251000" />
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<workItem from="1580562331089" duration="8037000" /> <workItem from="1580562331089" duration="8289000" />
<workItem from="1580626297484" duration="10002000" />
</task> </task>
<task id="LOCAL-00001" summary="add q5/q7/q172"> <task id="LOCAL-00001" summary="add q5/q7/q172">
<created>1580045439607</created> <created>1580045439607</created>
@ -263,7 +276,14 @@
<option name="project" value="LOCAL" /> <option name="project" value="LOCAL" />
<updated>1580496640692</updated> <updated>1580496640692</updated>
</task> </task>
<option name="localTasksCounter" value="8" /> <task id="LOCAL-00008" summary="add q46">
<created>1580585083883</created>
<option name="number" value="00008" />
<option name="presentableId" value="LOCAL-00008" />
<option name="project" value="LOCAL" />
<updated>1580585083883</updated>
</task>
<option name="localTasksCounter" value="9" />
<servers /> <servers />
</component> </component>
<component name="TypeScriptGeneratedFilesManager"> <component name="TypeScriptGeneratedFilesManager">
@ -277,69 +297,70 @@
<MESSAGE value="add q14/q16/q20" /> <MESSAGE value="add q14/q16/q20" />
<MESSAGE value="add q21" /> <MESSAGE value="add q21" />
<MESSAGE value="add q26/q43" /> <MESSAGE value="add q26/q43" />
<option name="LAST_COMMIT_MESSAGE" value="add q26/q43" /> <MESSAGE value="add q46" />
<option name="LAST_COMMIT_MESSAGE" value="add q46" />
</component> </component>
<component name="WindowStateProjectService"> <component name="WindowStateProjectService">
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<screen x="0" y="0" width="1440" height="900" /> <screen x="0" y="0" width="1440" height="900" />
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31
src/q53/q1/Solution.java
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@ -0,0 +1,31 @@
package q53.q1;
/**
* 贪心法 遍历一次 o(n)
*/
public class Solution {
public int maxSubArray(int[] nums) {
if (nums.length == 1) {
return nums[0];
}
int sum = nums[0];
int temp = sum;
for (int i = 1; i < nums.length; i++) {
temp = temp + nums[i];
if (temp >= sum) {
sum = temp;
} else if (temp < 0) {
temp = 0;
}
if (nums[i] > sum) {
temp = nums[i];
sum = nums[i];
}
}
return sum;
}
public static void main(String[] args) {
System.out.println(new Solution().maxSubArray(new int[]{-1, 1, 2, 1}));
}
}

24
src/q53/q2/Solution.java
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@ -0,0 +1,24 @@
package q53.q2;
/**
* 动态规划 dp[i]表示以nums[i]结尾的最大子序和 o(n)
*/
public class Solution {
public int maxSubArray(int[] nums) {
int[] dp = new int[nums.length];
dp[0] = nums[0];
int rs = dp[0];
for (int i = 1; i < nums.length; i++) {
int temp = dp[i - 1] + nums[i];
dp[i] = Math.max(nums[i],temp);
rs = Math.max(rs, dp[i]);
}
return rs;
}
public static void main(String[] args) {
System.out.println(new Solution().maxSubArray(new int[]{-2}));
}
}
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