Create 118. Pascal's Triangle.md

118. Pascal's Triangle.md

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+# [118. Pascal's Triangle](https://leetcode.com/problems/pascals-triangle/description/)
+# 思路
+首先明白题目要求返回的是一个vector，其元素也是vector，按照题目规律构造每个vector即可。
+# C++
+```
+class Solution {
+public:
+    vector<vector<int>> generate(int numRows) {
+        vector<vector<int> > result;
+        for(int i = 0; i < numRows; i++){
+            vector<int> tmp;
+            tmp.push_back(1);
+            for(int j = 1; j < i; j++){
+                tmp.push_back(result[i-1][j-1] + result[i-1][j]);
+            }
+            if(i > 0) tmp.push_back(1);  
+            result.push_back(tmp);
+        }
+        return result;  
+    }
+};
+```