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January 28, 2020 11:41
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| function solution(A) { | |
| while(A.length>0){ | |
| findEl=A.shift() | |
| indexEl=A.indexOf(findEl) | |
| if(indexEl>=0){ | |
| A.splice(indexEl,1) | |
| }else{ | |
| return findEl | |
| } | |
| } | |
| } |
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