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

add q1277

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pull/6/head
yuanguangxin 5 years ago
parent d581ca1a4c
commit f2064cbc45
3 changed files with 81 additions and 40 deletions
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82
.idea/workspace.xml
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@ -1,14 +1,10 @@
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<change afterPath="$PROJECT_DIR$/src/q110/TreeNode.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q450/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q450/TreeNode.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q701/Solution.java" afterDir="false" />
<change afterPath="$PROJECT_DIR$/src/q701/TreeNode.java" afterDir="false" />
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<change beforePath="$PROJECT_DIR$/Rocket.md" beforeDir="false" afterPath="$PROJECT_DIR$/Rocket.md" afterDir="false" />
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@ -83,7 +79,7 @@
<recent name="$PROJECT_DIR$/src/q206/f1" />
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<component name="RunManager" selected="Application.Solution (2)">
<component name="RunManager" selected="Application.Solution (3)">
<configuration name="Main" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="etc.tree.traversal.Main" />
<module name="LeetCode" />
@ -123,12 +119,12 @@
<option name="Make" enabled="true" />
</method>
</configuration>
<configuration name="Solution (4)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q144.Solution" />
<configuration name="Solution (3)" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q1277.Solution" />
<module name="LeetCode" />
<extension name="coverage">
<pattern>
<option name="PATTERN" value="q144.*" />
<option name="PATTERN" value="q1277.*" />
<option name="ENABLED" value="true" />
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@ -177,11 +173,11 @@
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@ -315,7 +311,14 @@
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@ -335,7 +338,8 @@
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2
Rocket.md
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@ -507,7 +507,7 @@ TCP是一个双向通信协议，通信双方都有能力发送信息，并接
(2)选择排序：选择排序与冒泡排序有点像，只不过选择排序每次都是在确定了最小数的下标之后再进行交换，大大减少了交换的次数
(3)插入排序：将一个记录插入到已排序的有序表中，从而得到一个新的，记录数增1的有序表
(4)快速排序：通过一趟排序将序列分成左右两部分，其中左半部分的的值均比右半部分的值小，然后再分别对左右部分的记录进行排序，直到整个序列有序。
```c
```
int partition(int a[], int low, int high){
int key = a[low];
while( low < high ){

37
src/q1277/Solution.java
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@ -0,0 +1,37 @@
package q1277;
/**
* 动态规划 dp[i][j]表示 matrix[i][j] 这个点可以往左上构造的最大正方形的边长 o(n^2)
*/
public class Solution {
public int countSquares(int[][] matrix) {
if (matrix.length < 1) {
return 0;
}
int m = matrix.length;
int n = matrix[0].length;
int[][] dp = new int[m][n];
int rs = 0;
for (int i = 0; i < m; i++) {
for (int j = 0; j < n; j++) {
if (matrix[i][j] == 0) {
dp[i][j] = 0;
} else {
if (i > 0 && j > 0) {
dp[i][j] = Math.min(Math.min(dp[i - 1][j], dp[i][j - 1]), dp[i - 1][j - 1]) + 1;
} else {
dp[i][j] = 1;
}
rs += dp[i][j];
}
}
}
return rs;
}
public static void main(String[] args) {
new Solution().countSquares(new int[][]{{0, 1, 1, 1}, {1, 1, 1, 1}, {0, 1, 1, 1}});
}
}
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