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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
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@ -150,5 +150,39 @@ var uniqueOccurrences = function(arr) {
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};
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```
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TypeScript:
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> 借用数组:
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```typescript
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function uniqueOccurrences(arr: number[]): boolean {
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const countArr: number[] = new Array(2001).fill(0);
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for (let i = 0, length = arr.length; i < length; i++) {
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countArr[arr[i] + 1000]++;
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}
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const flagArr: boolean[] = new Array(1001).fill(false);
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for (let count of countArr) {
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if (count === 0) continue;
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if (flagArr[count] === true) return false;
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flagArr[count] = true;
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}
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return true;
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};
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```
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> 借用map、set
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```typescript
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function uniqueOccurrences(arr: number[]): boolean {
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const countMap: Map<number, number> = new Map();
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arr.forEach(val => {
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countMap.set(val, (countMap.get(val) || 0) + 1);
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})
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return countMap.size === new Set(countMap.values()).size;
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};
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```
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-----------------------
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<div align="center"><img src=https://code-thinking.cdn.bcebos.com/pics/01二维码一.jpg width=500> </img></div>
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