Merge pull request #1280 from 0xff-dev/3479

Add solution and test-cases for problem 3479

Author: 6boris

leetcode/3401-3500/3479.Fruits-Into-Baskets-III/README.md

@@ -1,28 +1,45 @@
 # [3479.Fruits Into Baskets III][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
+You are given two arrays of integers, `fruits` and `baskets`, each of length `n`, where `fruits[i]` represents the **quantity** of the `ith` type of fruit, and `baskets[j]` represents the **capacity** of the `jth` basket.
+
+From left to right, place the fruits according to these rules:
+
+- Each fruit type must be placed in the **leftmost available basket** with a capacity **greater than or equal** to the quantity of that fruit type.
+- Each basket can hold **only one** type of fruit.
+- If a fruit type **cannot be placed** in any basket, it remains **unplaced**.
+
+Return the number of fruit types that remain unplaced after all possible allocations are made.
 
 **Example 1:**
 
 ```
-Input: a = "11", b = "1"
-Output: "100"
-```
+Input: fruits = [4,2,5], baskets = [3,5,4]
 
-## 题意
-> ...
+Output: 1
 
-## 题解
+Explanation:
 
-### 思路1
-> ...
-Fruits Into Baskets III
-```go
+fruits[0] = 4 is placed in baskets[1] = 5.
+fruits[1] = 2 is placed in baskets[0] = 3.
+fruits[2] = 5 cannot be placed in baskets[2] = 4.
+Since one fruit type remains unplaced, we return 1.
 ```
 
+**Example 2:**
+
+```
+Input: fruits = [3,6,1], baskets = [6,4,7]
+
+Output: 0
+
+Explanation:
+
+fruits[0] = 3 is placed in baskets[0] = 6.
+fruits[1] = 6 cannot be placed in baskets[1] = 4 (insufficient capacity) but can be placed in the next available basket, baskets[2] = 7.
+fruits[2] = 1 is placed in baskets[1] = 4.
+Since all fruits are successfully placed, we return 0.
+```
 
 ## 结语
 

leetcode/3401-3500/3479.Fruits-Into-Baskets-III/Solution.go

@@ -1,5 +1,83 @@
 package Solution
 
-func Solution(x bool) bool {
-	return x
+import "math"
+
+const (
+	INT_MIN = math.MinInt32
+)
+
+type SegTree struct {
+	segNode []int
+	baskets []int
+}
+
+func (this *SegTree) build(p, l, r int) {
+	if l == r {
+		this.segNode[p] = this.baskets[l]
+		return
+	}
+	mid := (l + r) >> 1
+	this.build(p<<1, l, mid)
+	this.build(p<<1|1, mid+1, r)
+	this.segNode[p] = max(this.segNode[p<<1], this.segNode[p<<1|1])
+}
+
+func (this *SegTree) query(p, l, r, ql, qr int) int {
+	if ql > r || qr < l {
+		return INT_MIN
+	}
+	if ql <= l && r <= qr {
+		return this.segNode[p]
+	}
+	mid := (l + r) >> 1
+	return max(this.query(p<<1, l, mid, ql, qr),
+		this.query(p<<1|1, mid+1, r, ql, qr))
+}
+
+func (this *SegTree) update(p, l, r, pos, val int) {
+	if l == r {
+		this.segNode[p] = val
+		return
+	}
+	mid := (l + r) >> 1
+	if pos <= mid {
+		this.update(p<<1, l, mid, pos, val)
+	} else {
+		this.update(p<<1|1, mid+1, r, pos, val)
+	}
+	this.segNode[p] = max(this.segNode[p<<1], this.segNode[p<<1|1])
+}
+
+func Solution(fruits []int, baskets []int) int {
+	m := len(baskets)
+	if m == 0 {
+		return len(fruits)
+	}
+
+	tree := SegTree{
+		segNode: make([]int, 4*m+7),
+		baskets: baskets,
+	}
+	tree.build(1, 0, m-1)
+
+	count := 0
+	for i := 0; i < len(fruits); i++ {
+		l, r, res := 0, m-1, -1
+		for l <= r {
+			mid := (l + r) >> 1
+			if tree.query(1, 0, m-1, 0, mid) >= fruits[i] {
+				res = mid
+				r = mid - 1
+			} else {
+				l = mid + 1
+			}
+		}
+		if res != -1 && tree.baskets[res] >= fruits[i] {
+			tree.update(1, 0, m-1, res, INT_MIN)
+		} else {
+			count++
+		}
+	}
+
+	return count
 }

leetcode/3401-3500/3479.Fruits-Into-Baskets-III/Solution_test.go

@@ -9,31 +9,30 @@ import (
 func TestSolution(t *testing.T) {
 	//	测试用例
 	cases := []struct {
-		name   string
-		inputs bool
-		expect bool
+		name            string
+		fruits, baskets []int
+		expect          int
 	}{
-		{"TestCase", true, true},
-		{"TestCase", true, true},
-		{"TestCase", false, false},
+		{"TestCase1", []int{4, 2, 5}, []int{3, 5, 4}, 1},
+		{"TestCase2", []int{3, 6, 1}, []int{6, 4, 7}, 0},
 	}
 
 	//	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.fruits, c.baskets)
 			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",
+					c.expect, got, c.fruits, c.baskets)
 			}
 		})
 	}
 }
 
-//	压力测试
+// 压力测试
 func BenchmarkSolution(b *testing.B) {
 }
 
-//	使用案列
+// 使用案列
 func ExampleSolution() {
 }