msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
1
2
Code Issues Projects Releases Wiki Activity

add q53

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pull/6/head
yuanguangxin 4 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 @@
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@ -75,7 +74,7 @@
<recent name="$PROJECT_DIR$/src/q206/f1" />
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<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">
<option name="MAIN_CLASS_NAME" value="q46.f2.Solution" />
<module name="LeetCode" />
@ -128,12 +127,25 @@
<option name="Make" enabled="true" />
</method>
</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">
<option name="MAIN_CLASS_NAME" value="q46.f1.Solution" />
<option name="MAIN_CLASS_NAME" value="q53.q1.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q46.f1.*" />
<option name="PATTERN" value="q53.q1.*" />
<option name="ENABLED" value="true" />
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@ -169,11 +181,11 @@
</configuration>
<recent_temporary>
<list>
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<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (1)" />
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<item itemvalue="Application.Solution (5)" />
<item itemvalue="Application.Solution (4)" />
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<created>1580045439607</created>
@ -263,7 +276,14 @@
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<updated>1580496640692</updated>
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@ -277,69 +297,70 @@
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<MESSAGE value="add q21" />
<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" />
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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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