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Feb 25, 2025
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feat: add solutions to lc problem: No.2502 #4107

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124 changes: 81 additions & 43 deletions solution/2500-2599/2502.Design Memory Allocator/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,7 @@ loc.freeMemory(7); // 释放 mID 为 7 的所有内存单元。内存数组保

<!-- solution:start -->

### 方法一：暴力模拟
### 方法一：模拟

题目数据范围不大，可以直接用数组模拟内存空间。

Expand All @@ -103,6 +103,7 @@ loc.freeMemory(7); // 释放 mID 为 7 的所有内存单元。内存数组保

```python
class Allocator:

def __init__(self, n: int):
self.m = [0] * n

Expand All @@ -118,7 +119,7 @@ class Allocator:
return i - size + 1
return -1

def free(self, mID: int) -> int:
def freeMemory(self, mID: int) -> int:
ans = 0
for i, v in enumerate(self.m):
if v == mID:
Expand All @@ -130,7 +131,7 @@ class Allocator:
# Your Allocator object will be instantiated and called as such:
# obj = Allocator(n)
# param_1 = obj.allocate(size,mID)
# param_2 = obj.free(mID)
# param_2 = obj.freeMemory(mID)
```

#### Java
Expand All @@ -156,7 +157,7 @@ class Allocator {
return -1;
}

public int free(int mID) {
public int freeMemory(int mID) {
int ans = 0;
for (int i = 0; i < m.length; ++i) {
if (m[i] == mID) {
Expand All @@ -172,7 +173,7 @@ class Allocator {
* Your Allocator object will be instantiated and called as such:
* Allocator obj = new Allocator(n);
* int param_1 = obj.allocate(size,mID);
* int param_2 = obj.free(mID);
* int param_2 = obj.freeMemory(mID);
*/
```

Expand All @@ -181,24 +182,26 @@ class Allocator {
```cpp
class Allocator {
public:
vector<int> m;

Allocator(int n) {
m = vector<int>(n);
m = vector<int>(n, 0);
}

int allocate(int size, int mID) {
int cnt = 0;
for (int i = 0; i < m.size(); ++i) {
if (m[i]) {
if (m[i] > 0) {
cnt = 0;
} else if (++cnt == size) {
fill(i - size + 1, i + 1, mID);
fill(m.begin() + i - size + 1, m.begin() + i + 1, mID);
return i - size + 1;
}
}
return -1;
}

int free(int mID) {
int freeMemory(int mID) {
int ans = 0;
for (int i = 0; i < m.size(); ++i) {
if (m[i] == mID) {
Expand All @@ -208,22 +211,13 @@ public:
}
return ans;
}

private:
vector<int> m;

void fill(int from, int to, int val) {
for (int i = from; i < to; ++i) {
m[i] = val;
}
}
};

/**
* Your Allocator object will be instantiated and called as such:
* Allocator* obj = new Allocator(n);
* int param_1 = obj->allocate(size,mID);
* int param_2 = obj->free(mID);
* int param_2 = obj->freeMemory(mID);
*/
```

Expand All @@ -235,42 +229,85 @@ type Allocator struct {
}

func Constructor(n int) Allocator {
return Allocator{make([]int, n)}
return Allocator{m: make([]int, n)}
}

func (this *Allocator) Allocate(size int, mID int) int {
cnt := 0
for i, v := range this.m {
if v > 0 {
for i := 0; i < len(this.m); i++ {
if this.m[i] > 0 {
cnt = 0
} else {
cnt++
if cnt == size {
for j := i - size + 1; j <= i; j++ {
this.m[j] = mID
}
return i - size + 1
} else if cnt++; cnt == size {
for j := i - size + 1; j <= i; j++ {
this.m[j] = mID
}
return i - size + 1
}
}
return -1
}

func (this *Allocator) Free(mID int) (ans int) {
for i, v := range this.m {
if v == mID {
func (this *Allocator) FreeMemory(mID int) int {
ans := 0
for i := 0; i < len(this.m); i++ {
if this.m[i] == mID {
this.m[i] = 0
ans++
}
}
return
return ans
}

/**
* Your Allocator object will be instantiated and called as such:
* obj := Constructor(n);
* param_1 := obj.Allocate(size,mID);
* param_2 := obj.Free(mID);
* param_2 := obj.FreeMemory(mID);
*/
```

#### TypeScript

```ts
class Allocator {
private m: number[];

constructor(n: number) {
this.m = Array(n).fill(0);
}

allocate(size: number, mID: number): number {
let cnt = 0;
for (let i = 0; i < this.m.length; i++) {
if (this.m[i] > 0) {
cnt = 0;
} else if (++cnt === size) {
for (let j = i - size + 1; j <= i; j++) {
this.m[j] = mID;
}
return i - size + 1;
}
}
return -1;
}

freeMemory(mID: number): number {
let ans = 0;
for (let i = 0; i < this.m.length; i++) {
if (this.m[i] === mID) {
this.m[i] = 0;
ans++;
}
}
return ans;
}
}

/**
* Your Allocator object will be instantiated and called as such:
* var obj = new Allocator(n)
* var param_1 = obj.allocate(size,mID)
* var param_2 = obj.freeMemory(mID)
*/
```

Expand All @@ -296,6 +333,7 @@ func (this *Allocator) Free(mID int) (ans int) {

```python
class Allocator:

def __init__(self, n: int):
self.sl = SortedList([(-1, -1), (n, n)])
self.d = defaultdict(list)
Expand All @@ -309,7 +347,7 @@ class Allocator:
return s
return -1

def free(self, mID: int) -> int:
def freeMemory(self, mID: int) -> int:
ans = 0
for block in self.d[mID]:
self.sl.remove(block)
Expand All @@ -321,7 +359,7 @@ class Allocator:
# Your Allocator object will be instantiated and called as such:
# obj = Allocator(n)
# param_1 = obj.allocate(size,mID)
# param_2 = obj.free(mID)
# param_2 = obj.freeMemory(mID)
```

#### Java
Expand Down Expand Up @@ -353,9 +391,9 @@ class Allocator {
return -1;
}

public int free(int mID) {
public int freeMemory(int mID) {
int ans = 0;
for (int s : d.getOrDefault(mID, Collections.emptyList())) {
for (int s : d.getOrDefault(mID, List.of())) {
int e = tm.remove(s);
ans += e - s + 1;
}
Expand All @@ -368,7 +406,7 @@ class Allocator {
* Your Allocator object will be instantiated and called as such:
* Allocator obj = new Allocator(n);
* int param_1 = obj.allocate(size,mID);
* int param_2 = obj.free(mID);
* int param_2 = obj.freeMemory(mID);
*/
```

Expand Down Expand Up @@ -398,7 +436,7 @@ public:
return -1;
}

int free(int mID) {
int freeMemory(int mID) {
int ans = 0;
for (int& s : d[mID]) {
int e = tm[s];
Expand All @@ -418,7 +456,7 @@ private:
* Your Allocator object will be instantiated and called as such:
* Allocator* obj = new Allocator(n);
* int param_1 = obj->allocate(size,mID);
* int param_2 = obj->free(mID);
* int param_2 = obj->freeMemory(mID);
*/
```

Expand Down Expand Up @@ -455,7 +493,7 @@ func (this *Allocator) Allocate(size int, mID int) int {
return -1
}

func (this *Allocator) Free(mID int) int {
func (this *Allocator) FreeMemory(mID int) int {
ans := 0
for _, s := range this.d[mID] {
if e, ok := this.rbt.Get(s); ok {
Expand All @@ -471,7 +509,7 @@ func (this *Allocator) Free(mID int) int {
* Your Allocator object will be instantiated and called as such:
* obj := Constructor(n);
* param_1 := obj.Allocate(size,mID);
* param_2 := obj.Free(mID);
* param_2 := obj.FreeMemory(mID);
*/
```

Expand Down
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