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

add q64

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pull/6/head
yuanguangxin 4 years ago
parent cded4a22b7
commit 4bca22a759
3 changed files with 43 additions and 16 deletions
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32
.idea/workspace.xml
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@ -2,7 +2,7 @@
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@ -687,7 +686,8 @@
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1
README.md
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@ -85,6 +85,7 @@
* [q5_最长回文子串](/src/动态规划/q5_最长回文子串)
* [q53_最大子序和](/src/动态规划/q53_最大子序和)
* [q64_最小路径和](/src/动态规划/q64_最小路径和)
* [q70_爬楼梯](/src/动态规划/q70_爬楼梯)
* [q118_杨辉三角](/src/动态规划/q118_杨辉三角)
* [q300_最长上升子序列](/src/动态规划/q300_最长上升子序列)

26
src/动态规划/q64_最小路径和/Solution.java
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@ -0,0 +1,26 @@
package 动态规划.q64_最小路径和;
/**
* 动态规划 dp(j)=grid(i,j)+min(dp(j),dp(j+1)) o(m*n)
*/
public class Solution {
public int minPathSum(int[][] grid) {
int[] dp = new int[grid[0].length];
for (int i = grid.length - 1; i >= 0; i--) {
for (int j = grid[0].length - 1; j >= 0; j--) {
if (i == grid.length - 1 && j != grid[0].length - 1) {
dp[j] = grid[i][j] + dp[j + 1];
} else if (j == grid[0].length - 1 && i != grid.length - 1) {
dp[j] = grid[i][j] + dp[j];
} else if (j != grid[0].length - 1 && i != grid.length - 1) {
dp[j] = grid[i][j] + Math.min(dp[j], dp[j + 1]);
} else {
dp[j] = grid[i][j];
}
}
}
return dp[0];
}
}
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