Merge pull request #1401 from xiaofei-2020/extra03

添加(1207.独一无二的出现次数.md):增加typescript版本
This commit is contained in:
程序员Carl
2022-06-27 09:23:19 +08:00
committed by GitHub

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@ -150,5 +150,39 @@ var uniqueOccurrences = function(arr) {
};
```
TypeScript
> 借用数组:
```typescript
function uniqueOccurrences(arr: number[]): boolean {
const countArr: number[] = new Array(2001).fill(0);
for (let i = 0, length = arr.length; i < length; i++) {
countArr[arr[i] + 1000]++;
}
const flagArr: boolean[] = new Array(1001).fill(false);
for (let count of countArr) {
if (count === 0) continue;
if (flagArr[count] === true) return false;
flagArr[count] = true;
}
return true;
};
```
> 借用map、set
```typescript
function uniqueOccurrences(arr: number[]): boolean {
const countMap: Map<number, number> = new Map();
arr.forEach(val => {
countMap.set(val, (countMap.get(val) || 0) + 1);
})
return countMap.size === new Set(countMap.values()).size;
};
```
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