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# 第九周学习笔记
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## 不同路径II状态转移方程
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1. 状态定义
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* 状态定义
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dp[i][j] 表示走到格子(i, j)的方法数
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2. 状态转义
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* 状态转义
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(i, j)上有障碍物 dp[i][j] = 0
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(i, j)上无障碍物 dp[i][j] = dp[i - 1][j] + dp[i][j - 1]
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(i, j)上无障碍物 dp[i][j] = dp[i - 1][j] + dp[i][j - 1]

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