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| function solution(A) { | |
| // write your code in JavaScript (Node.js 8.9.4) | |
| const unique = [...new Set(A)].sort((x,y)=>x-y); | |
| if(unique.length!=A.length) return 0; | |
| for(let cntr=0; cntr<unique.length; cntr++) | |
| if(cntr+1 != unique[cntr]) | |
| return 0; | |
| return 1; | |
| } |
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