msb-public-java
/
LeetCode
mirror of https://github.com/yuanguangxin/LeetCode
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add q54

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pull/6/head
yuanguangxin 4 years ago
parent 4dfbf67583
commit 832b75721a
2 changed files with 100 additions and 34 deletions
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62
.idea/workspace.xml
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@ -2,8 +2,7 @@
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@ -101,19 +100,6 @@
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<module name="LeetCode" />
@ -141,11 +127,11 @@
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</configuration>
<configuration name="Solution" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
<option name="MAIN_CLASS_NAME" value="q53.q1.Solution" />
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<module name="LeetCode" />
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@ -181,11 +167,11 @@
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@ -298,40 +291,41 @@
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72
src/q54/Solution.java
Unescape View File

@ -0,0 +1,72 @@
package q54;
import java.util.ArrayList;
import java.util.List;
/**
* 方向变量模拟路径 o(n)
*/
public class Solution {
public List<Integer> spiralOrder(int[][] matrix) {
List<Integer> rs = new ArrayList<>();
if (matrix.length == 0 || matrix[0].length == 0) {
return rs;
}
int m = matrix.length;
int n = matrix[0].length;
boolean[][] visited = new boolean[m][n];
int i = 0;
int j = 0;
int direction = 1;
while (true) {
if (i < 0 || j < 0 || i == m || j == n || visited[i][j]) {
break;
}
rs.add(matrix[i][j]);
visited[i][j] = true;
switch (direction) {
case 1:
if (j + 1 == n || visited[i][j + 1]) {
i++;
direction = 2;
} else {
j++;
}
break;
case 2:
if (i + 1 == m || visited[i + 1][j]) {
j--;
direction = 3;
} else {
i++;
}
break;
case 3:
if (j == 0 || visited[i][j - 1]) {
i--;
direction = 4;
} else {
j--;
}
break;
case 4:
if (visited[i - 1][j]) {
j++;
direction = 1;
} else {
i--;
}
break;
default:
break;
}
}
return rs;
}
public static void main(String[] args) {
System.out.println(new Solution().spiralOrder(new int[][]{{1, 2, 3}, {4, 5, 6}, {7, 8, 9}}));
}
}
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