add: leetcode 0551 solution

leetcode/0551.Student-Attendance-Record-I/551.Student Attendance Record I.go

@@ -0,0 +1,24 @@
+package leetcode
+
+func checkRecord(s string) bool {
+	numsA := 0
+	maxL := 0
+	numsL := 0
+	for _, v := range s {
+		if v == 'L' {
+			numsL++
+		} else {
+			if numsL > maxL {
+				maxL = numsL
+			}
+			numsL = 0
+			if v == 'A' {
+				numsA++
+			}
+		}
+	}
+	if numsL > maxL {
+		maxL = numsL
+	}
+	return numsA < 2 && maxL < 3
+}

leetcode/0551.Student-Attendance-Record-I/551.Student Attendance Record I_test.go

@@ -0,0 +1,45 @@
+package leetcode
+
+import (
+	"fmt"
+	"testing"
+)
+
+type question551 struct {
+	para551
+	ans551
+}
+
+// para 是参数
+type para551 struct {
+	s string
+}
+
+// ans 是答案
+type ans551 struct {
+	ans bool
+}
+
+func Test_Problem551(t *testing.T) {
+
+	qs := []question551{
+
+		{
+			para551{"PPALLP"},
+			ans551{true},
+		},
+
+		{
+			para551{"PPALLL"},
+			ans551{false},
+		},
+	}
+
+	fmt.Printf("------------------------Leetcode Problem 551------------------------\n")
+
+	for _, q := range qs {
+		_, p := q.ans551, q.para551
+		fmt.Printf("【input】:%v      【output】:%v      \n", p, checkRecord(p.s))
+	}
+	fmt.Printf("\n\n\n")
+}

leetcode/0551.Student-Attendance-Record-I/README.md

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+# [551. Student Attendance Record I](https://leetcode-cn.com/problems/student-attendance-record-i/)
+
+## 题目
+
+You are given a string s representing an attendance record for a student where each character signifies whether the student was absent, late, or present on that day. The record only contains the following three characters:
+
+- 'A': Absent. 
+- 'L': Late.
+- 'P': Present.
+
+The student is eligible for an attendance award if they meet both of the following criteria:
+
+The student was absent ('A') for strictly fewer than 2 days total.
+
+The student was never late ('L') for 3 or more consecutive days.
+
+Return true if the student is eligible for an attendance award, or false otherwise.
+
+**Example 1:**
+
+    Input: s = "PPALLP"
+    Output: true
+    Explanation: The student has fewer than 2 absences and was never late 3 or more consecutive days.
+
+**Example 2:**
+
+    Input: s = "PPALLL"
+    Output: false
+    Explanation: The student was late 3 consecutive days in the last 3 days, so is not eligible for the award.
+
+**Constraints:**
+
+- 1 <= s.length <= 1000
+- s[i] is either 'A', 'L', or 'P'.
+
+## 题目大意
+
+给你一个字符串 s 表示一个学生的出勤记录，其中的每个字符用来标记当天的出勤情况（缺勤、迟到、到场）。记录中只含下面三种字符：
+
+- 'A'：Absent，缺勤
+- 'L'：Late，迟到
+- 'P'：Present，到场
+
+如果学生能够 同时 满足下面两个条件，则可以获得出勤奖励：
+
+按 总出勤 计，学生缺勤（'A'）严格 少于两天。
+
+学生 不会 存在 连续 3 天或 3 天以上的迟到（'L'）记录。
+
+如果学生可以获得出勤奖励，返回 true ；否则，返回 false 。
+
+## 解题思路
+
+- 遍历字符串s求出'A'的总数量和连续'L'的最大数量
+- 比较'A'的数量是否小于2并且'L'的连续最大数量是否小于3