Merge pull request #1079 from 0xff-dev/1253

Add solution and test-cases for problem 1253

Author: 6boris

leetcode/1201-1300/1253.Reconstruct-a-2-Row-Binary-Matrix/README.md

@@ -1,28 +1,42 @@
 # [1253.Reconstruct a 2-Row Binary Matrix][title]
 
-> [!WARNING|style:flat]
-> This question is temporarily unanswered if you have good ideas. Welcome to [Create Pull Request PR](https://github.com/kylesliu/awesome-golang-algorithm)
-
 ## Description
+Given the following details of a matrix with `n` columns and `2` rows :
+
+- The matrix is a binary matrix, which means each element in the matrix can be `0` or `1`.
+- The sum of elements of the 0-th(upper) row is given as `upper`.
+- The sum of elements of the 1-st(lower) row is given as `lower`.
+- The sum of elements in the i-th column(0-indexed) is `colsum[i]`, where `colsum` is given as an integer array with length `n`.
+
+Your task is to reconstruct the matrix with `upper`, `lower` and `colsum`.
+
+Return it as a 2-D integer array.
+
+If there are more than one valid solution, any of them will be accepted.
+
+If no valid solution exists, return an empty 2-D array.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
+Input: upper = 2, lower = 1, colsum = [1,1,1]
+Output: [[1,1,0],[0,0,1]]
+Explanation: [[1,0,1],[0,1,0]], and [[0,1,1],[1,0,0]] are also correct answers.
 ```
 
-## 题意
-> ...
+**Example 2:**
 
-## 题解
-
-### 思路1
-> ...
-Reconstruct a 2-Row Binary Matrix
-```go
 ```
+Input: upper = 2, lower = 3, colsum = [2,2,1,1]
+Output: []
+```
+
+**Example 3:**
 
+```
+Input: upper = 5, lower = 5, colsum = [2,1,2,0,1,0,1,2,0,1]
+Output: [[1,1,1,0,1,0,0,1,0,0],[1,0,1,0,0,0,1,1,0,1]]
+```
 
 ## 结语
 

leetcode/1201-1300/1253.Reconstruct-a-2-Row-Binary-Matrix/Solution.go

@@ -1,5 +1,47 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+func Solution(upper int, lower int, colsum []int) [][]int {
+	res := make([][]int, 2)
+	l := len(colsum)
+	sum := 0
+	for i := range l {
+		sum += colsum[i]
+	}
+	if sum != upper+lower {
+		return nil
+	}
+
+	for i := range 2 {
+		res[i] = make([]int, l)
+	}
+
+	for i := range l {
+		if colsum[i] == 2 {
+			if upper == 0 || lower == 0 {
+				return nil
+			}
+			res[0][i] = 1
+			res[1][i] = 1
+			upper--
+			lower--
+		}
+	}
+
+	for i := range l {
+		if colsum[i] == 1 {
+			if upper > 0 {
+				res[0][i] = 1
+				upper--
+				continue
+			}
+			if lower > 0 {
+				res[1][i] = 1
+				lower--
+				continue
+			}
+			return nil
+		}
+	}
+
+	return res
 }

leetcode/1201-1300/1253.Reconstruct-a-2-Row-Binary-Matrix/Solution_test.go

@@ -9,31 +9,32 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name         string
+		upper, lower int
+		colsum       []int
+		expect       [][]int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", 2, 1, []int{1, 1, 1}, [][]int{{1, 1, 0}, {0, 0, 1}}},
+		{"TestCase2", 2, 3, []int{2, 2, 1, 1}, nil},
+		{"TestCase3", 5, 5, []int{2, 1, 2, 0, 1, 0, 1, 2, 0, 1}, [][]int{{1, 1, 1, 0, 1, 0, 0, 1, 0, 0}, {1, 0, 1, 0, 0, 0, 1, 1, 0, 1}}},
 	}
 
 	//	开始测试
 	for i, c := range cases {
 		t.Run(c.name+" "+strconv.Itoa(i), func(t *testing.T) {
-			got := Solution(c.inputs)
+			got := Solution(c.upper, c.lower, c.colsum)
 			if !reflect.DeepEqual(got, c.expect) {
-				t.Fatalf("expected: %v, but got: %v, with inputs: %v",
-					c.expect, got, c.inputs)
+				t.Fatalf("expected: %v, but got: %v, with inputs: %v %v %v",
+					c.expect, got, c.upper, c.lower, c.colsum)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }