Merge pull request #49 from imjma/problem-118

Add Problem 118

leetcode/0118.Pascals-Triangle/118. Pascals-Triangle.go

@@ -0,0 +1,21 @@
+package leetcode
+
+func generate(numRows int) [][]int {
+	var result [][]int
+
+	for i := 0; i < numRows; i++ {
+		var row []int
+
+		for j := 0; j < i+1; j++ {
+			if j == 0 || j == i {
+				row = append(row, 1)
+			} else if i > 1 {
+				row = append(row, result[i-1][j-1]+result[i-1][j])
+			}
+		}
+
+		result = append(result, row)
+	}
+
+	return result
+}

leetcode/0118.Pascals-Triangle/118. Pascals-Triangle_test.go

@@ -0,0 +1,52 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question118 struct {
+	para118
+	ans118
+}
+
+// para 是参数
+// one 代表第一个参数
+type para118 struct {
+	numRows int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans118 struct {
+	one [][]int
+}
+
+func Test_Problem118(t *testing.T) {
+
+	qs := []question118{
+
+		question118{
+			para118{2},
+			ans118{[][]int{{1}, {1, 1}}},
+		},
+
+		question118{
+			para118{5},
+			ans118{[][]int{{1}, {1, 1}, {1, 2, 1}, {1, 3, 3, 1}, {1, 4, 6, 4, 1}}},
+		},
+
+		question118{
+			para118{10},
+			ans118{[][]int{{1}, {1, 1}, {1, 2, 1}, {1, 3, 3, 1}, {1, 4, 6, 4, 1}, {1, 5, 10, 10, 5, 1}, {1, 6, 15, 20, 15, 6, 1}, {1, 7, 21, 35, 35, 21, 7, 1}, {1, 8, 28, 56, 70, 56, 28, 8, 1}, {1, 9, 36, 84, 126, 126, 84, 36, 9, 1}}},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 118------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans118, q.para118
+		fmt.Printf("【input】:%v    【output】:%v\n", p, generate(p.numRows))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0118.Pascals-Triangle/README.md

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+# [118. Pascal's Triangle](https://leetcode.com/problems/pascals-triangle/
+
+
+## 题目
+
+Given a non-negative integer numRows, generate the first numRows of Pascal's triangle.
+
+![](https://upload.wikimedia.org/wikipedia/commons/0/0d/PascalTriangleAnimated2.gif)
+
+**Note:** In Pascal's triangle, each number is the sum of the two numbers directly above it.
+
+**Example:**
+
+```
+Input: 5
+Output:
+[
+     [1],
+    [1,1],
+   [1,2,1],
+  [1,3,3,1],
+ [1,4,6,4,1]
+]
+```
+
+## 题目大意
+
+给一个正整数来生成一个帕斯卡三角形
+
+## 解题思路
+
+