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public class Solution {
    public int minimumTotal(List<List<Integer>> triangle) {
        if (triangle == null) return -1;
        int layer = triangle.size();
        int[] dp = new int[layer + 1];
        for (int i = layer - 1; i >= 0; i--) {
            for (int j = 0; j < triangle.get(i).size(); j++) {
                dp[j] = Math.min(dp[j],dp[j + 1]) + triangle.get(i).get(j);
            }
        } 
        return dp[0];
    }
}