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feat: update ts and add js solutions to lc problem: No.2134 #3351

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Merged
yanglbme merged 6 commits into doocs:main from rain84:feature/lc-2134
Sep 3, 2024
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View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -163,15 +163,35 @@ func minSwaps(nums []int) int {

```ts
function minSwaps(nums: number[]): number {
const n = nums.length;
const k = nums.reduce((a, b) => a + b, 0);
let cnt = nums.slice(0, k).reduce((a, b) => a + b, 0);
let mx = cnt;
let cnt = k - nums.slice(0, k).reduce((a, b) => a + b, 0);
let min = cnt;

for (let i = k; i < n + k; i++) {
cnt += nums[i - k] - nums[i % n];
min = Math.min(min, cnt);
}

return min;
}
```

#### JavaScript

```js
function minSwaps(nums) {
const n = nums.length;
for (let i = k; i < n + k; ++i) {
cnt += nums[i % n] - nums[(i - k + n) % n];
mx = Math.max(mx, cnt);
const k = nums.reduce((a, b) => a + b, 0);
let cnt = k - nums.slice(0, k).reduce((a, b) => a + b, 0);
let min = cnt;

for (let i = k; i < n + k; i++) {
cnt += nums[i - k] - nums[i % n];
min = Math.min(min, cnt);
}
return k - mx;

return min;
}
```

Expand Down Expand Up @@ -222,4 +242,66 @@ public class Solution {

<!-- solution:end -->

<!-- solution:start -->

### 方法二:前缀和

<!-- tabs:start -->

#### TypeScript

```ts
function minSwaps(nums: number[]): number {
const n = nums.length;

const getMin = (x: 0 | 1) => {
const prefixSum = Array(n + 1).fill(0);
for (let i = 1; i <= n; i++) {
prefixSum[i] = prefixSum[i - 1] + (nums[i - 1] === x);
}

const length = prefixSum[n];
let ans = Number.POSITIVE_INFINITY;
for (let l = 0, r = length; r <= n; l++, r++) {
const min = length - (prefixSum[r] - prefixSum[l]);
ans = Math.min(ans, min);
}

return ans;
};

return Math.min(getMin(0), getMin(1));
}
```

#### JavaScript

```js
function minSwaps(nums) {
const n = nums.length;

const getMin = x => {
const prefixSum = Array(n + 1).fill(0);
for (let i = 1; i <= n; i++) {
prefixSum[i] = prefixSum[i - 1] + (nums[i - 1] === x);
}

const length = prefixSum[n];
let ans = Number.POSITIVE_INFINITY;
for (let l = 0, r = length; r <= n; l++, r++) {
const min = length - (prefixSum[r] - prefixSum[l]);
ans = Math.min(ans, min);
}

return ans;
};

return Math.min(getMin(0), getMin(1));
}
```

<!-- tabs:end -->

<!-- solution:end -->

<!-- problem:end -->
View file Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -165,15 +165,35 @@ func minSwaps(nums []int) int {

```ts
function minSwaps(nums: number[]): number {
const n = nums.length;
const k = nums.reduce((a, b) => a + b, 0);
let cnt = nums.slice(0, k).reduce((a, b) => a + b, 0);
let mx = cnt;
let cnt = k - nums.slice(0, k).reduce((a, b) => a + b, 0);
let min = cnt;

for (let i = k; i < n + k; i++) {
cnt += nums[i - k] - nums[i % n];
min = Math.min(min, cnt);
}

return min;
}
```

#### JavaScript

```ts
function minSwaps(nums) {
const n = nums.length;
for (let i = k; i < n + k; ++i) {
cnt += nums[i % n] - nums[(i - k + n) % n];
mx = Math.max(mx, cnt);
const k = nums.reduce((a, b) => a + b, 0);
let cnt = k - nums.slice(0, k).reduce((a, b) => a + b, 0);
let min = cnt;

for (let i = k; i < n + k; i++) {
cnt += nums[i - k] - nums[i % n];
min = Math.min(min, cnt);
}
return k - mx;

return min;
}
```

Expand Down Expand Up @@ -224,4 +244,66 @@ public class Solution {

<!-- solution:end -->

<!-- solution:start -->

### Solution 2: Prefix Sum

<!-- tabs:start -->

#### TypeScript

```ts
function minSwaps(nums: number[]): number {
const n = nums.length;

const getMin = (x: 0 | 1) => {
const prefixSum = Array(n + 1).fill(0);
for (let i = 1; i <= n; i++) {
prefixSum[i] = prefixSum[i - 1] + (nums[i - 1] === x);
}

const length = prefixSum[n];
let ans = Number.POSITIVE_INFINITY;
for (let l = 0, r = length; r <= n; l++, r++) {
const min = length - (prefixSum[r] - prefixSum[l]);
ans = Math.min(ans, min);
}

return ans;
};

return Math.min(getMin(0), getMin(1));
}
```

#### JavaScript

```js
function minSwaps(nums) {
const n = nums.length;

const getMin = x => {
const prefixSum = Array(n + 1).fill(0);
for (let i = 1; i <= n; i++) {
prefixSum[i] = prefixSum[i - 1] + (nums[i - 1] === x);
}

const length = prefixSum[n];
let ans = Number.POSITIVE_INFINITY;
for (let l = 0, r = length; r <= n; l++, r++) {
const min = length - (prefixSum[r] - prefixSum[l]);
ans = Math.min(ans, min);
}

return ans;
};

return Math.min(getMin(0), getMin(1));
}
```

<!-- tabs:end -->

<!-- solution:end -->

<!-- problem:end -->
View file Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,13 @@
function minSwaps(nums) {
const n = nums.length;
const k = nums.reduce((a, b) => a + b, 0);
let cnt = k - nums.slice(0, k).reduce((a, b) => a + b, 0);
let min = cnt;

for (let i = k; i < n + k; i++) {
cnt += nums[i - k] - nums[i % n];
min = Math.min(min, cnt);
}

return min;
}
View file Open in desktop
Original file line number Diff line number Diff line change
@@ -1,11 +1,13 @@
function minSwaps(nums: number[]): number {
const k = nums.reduce((a, b) => a + b, 0);
let cnt = nums.slice(0, k).reduce((a, b) => a + b, 0);
let mx = cnt;
const n = nums.length;
for (let i = k; i < n + k; ++i) {
cnt += nums[i % n] - nums[(i - k + n) % n];
mx = Math.max(mx, cnt);
const k = nums.reduce((a, b) => a + b, 0);
let cnt = k - nums.slice(0, k).reduce((a, b) => a + b, 0);
let min = cnt;

for (let i = k; i < n + k; i++) {
cnt += nums[i - k] - nums[i % n];
min = Math.min(min, cnt);
}
return k - mx;

return min;
}
View file Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
function minSwaps(nums) {
const n = nums.length;

const getMin = x => {
const prefixSum = Array(n + 1).fill(0);
for (let i = 1; i <= n; i++) {
prefixSum[i] = prefixSum[i - 1] + (nums[i - 1] === x);
}

const length = prefixSum[n];
let ans = Number.POSITIVE_INFINITY;
for (let l = 0, r = length; r <= n; l++, r++) {
const min = length - (prefixSum[r] - prefixSum[l]);
ans = Math.min(ans, min);
}

return ans;
};

return Math.min(getMin(0), getMin(1));
}
View file Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,21 @@
function minSwaps(nums: number[]): number {
const n = nums.length;

const getMin = (x: 0 | 1) => {
const prefixSum = Array(n + 1).fill(0);
for (let i = 1; i <= n; i++) {
prefixSum[i] = prefixSum[i - 1] + (nums[i - 1] === x);
}

const length = prefixSum[n];
let ans = Number.POSITIVE_INFINITY;
for (let l = 0, r = length; r <= n; l++, r++) {
const min = length - (prefixSum[r] - prefixSum[l]);
ans = Math.min(ans, min);
}

return ans;
};

return Math.min(getMin(0), getMin(1));
}
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