题目： 

 

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解析： 

状态表示+状态转移方程： 

 

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初始化+填表顺序+返回值： 

 

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代码：  

public int minInsertions(String ss) {char[] s = ss.toCharArray();int n = s.length; int[][] dp = new int[n][n]; for(int i = n-1; i >= 0; i--){ // dp[0][i] = 0;for(int j = i+1; j < n; j++){if(s[i] == s[j]) dp[i][j] = dp[i+1][j-1];else dp[i][j] = Math.min(dp[i][j-1],dp[i+1][j])+1;}}return dp[0][n-1];}