Add solution 0374

leetcode/0374.Guess-Number-Higher-or-Lower/374. Guess Number Higher or Lower.go

@@ -0,0 +1,20 @@
+package leetcode
+
+import "sort"
+
+/**
+ * Forward declaration of guess API.
+ * @param  num   your guess
+ * @return 	     -1 if num is lower than the guess number
+ *			      1 if num is higher than the guess number
+ *               otherwise return 0
+ * func guess(num int) int;
+ */
+
+func guessNumber(n int) int {
+	return sort.Search(n, func(x int) bool { return guess(x) <= 0 })
+}
+
+func guess(num int) int {
+	return 0
+}

leetcode/0374.Guess-Number-Higher-or-Lower/374. Guess Number Higher or Lower_test.go

@@ -0,0 +1,58 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question374 struct {
+	para374
+	ans374
+}
+
+// para 是参数
+// one 代表第一个参数
+type para374 struct {
+	n int
+}
+
+// ans 是答案
+// one 代表第一个答案
+type ans374 struct {
+	one int
+}
+
+func Test_Problem374(t *testing.T) {
+
+	qs := []question374{
+
+		{
+			para374{10},
+			ans374{6},
+		},
+
+		{
+			para374{1},
+			ans374{1},
+		},
+
+		{
+			para374{2},
+			ans374{1},
+		},
+
+		{
+			para374{2},
+			ans374{2},
+		},
+		// 如需多个测试，可以复制上方元素。
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 374------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans374, q.para374
+		fmt.Printf("【input】:%v       【output】:%v\n", p, guessNumber(p.n))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0374.Guess-Number-Higher-or-Lower/README.md

@@ -0,0 +1,94 @@
+# [374. Guess Number Higher or Lower](https://leetcode.com/problems/guess-number-higher-or-lower/)
+
+## 题目
+
+We are playing the Guess Game. The game is as follows:
+
+I pick a number from `1` to `n`. You have to guess which number I picked.
+
+Every time you guess wrong, I will tell you whether the number I picked is higher or lower than your guess.
+
+You call a pre-defined API `int guess(int num)`, which returns 3 possible results:
+
+- `1`: The number I picked is lower than your guess (i.e. `pick < num`).
+- `1`: The number I picked is higher than your guess (i.e. `pick > num`).
+- `0`: The number I picked is equal to your guess (i.e. `pick == num`).
+
+Return *the number that I picked*.
+
+**Example 1:**
+
+```
+Input: n = 10, pick = 6
+Output: 6
+```
+
+**Example 2:**
+
+```
+Input: n = 1, pick = 1
+Output: 1
+```
+
+**Example 3:**
+
+```
+Input: n = 2, pick = 1
+Output: 1
+```
+
+**Example 4:**
+
+```
+Input: n = 2, pick = 2
+Output: 2
+```
+
+**Constraints:**
+
+- `1 <= n <= 231 - 1`
+- `1 <= pick <= n`
+
+## 题目大意
+
+猜数字游戏的规则如下：
+
+- 每轮游戏，我都会从 1 到 n 随机选择一个数字。 请你猜选出的是哪个数字。
+- 如果你猜错了，我会告诉你，你猜测的数字比我选出的数字是大了还是小了。
+
+你可以通过调用一个预先定义好的接口 int guess(int num) 来获取猜测结果，返回值一共有 3 种可能的情况（-1，1 或 0）：
+
+- 1：我选出的数字比你猜的数字小 pick < num
+- 1：我选出的数字比你猜的数字大 pick > num
+- 0：我选出的数字和你猜的数字一样。恭喜！你猜对了！pick == num
+
+返回我选出的数字。
+
+## 解题思路
+
+- 这一题是简单题，和小时候玩的猜大猜小的游戏一样。思路很简单，二分查找即可。这一题和第 278 题类似。
+
+## 代码
+
+```go
+package leetcode
+
+import "sort"
+
+/**
+ * Forward declaration of guess API.
+ * @param  num   your guess
+ * @return 	     -1 if num is lower than the guess number
+ *			      1 if num is higher than the guess number
+ *               otherwise return 0
+ * func guess(num int) int;
+ */
+
+func guessNumber(n int) int {
+	return sort.Search(n, func(x int) bool { return guess(x) <= 0 })
+}
+
+func guess(num int) int {
+	return 0
+}
+```