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create 118-Pascals-Triangle.java
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java/118-Pascals-Triangle.java

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class Solution {
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public List<List<Integer>> generate(int numRows) {
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List<List<Integer>> res = new ArrayList<>();
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for(int i=0; i<numRows; i++){
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List<Integer> list = new ArrayList<>();
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for(int j=0; j<=i; j++){
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if(j>0 && i>0 && res.get(i-1).size()-1>=j){
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list.add(res.get(i-1).get(j-1)+res.get(i-1).get(j));
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} else{
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list.add(1);
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}
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}
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res.add(list);
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}
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return res;
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}
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}

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