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Security Involution

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  • gianlucca
     + 0 comments

    js 

    function processData(input) {
    //Enter your code here
    let arr = (input.split(`\n`)[1].split(' ').map(e => Number(e)))
    let c =0;
        
    let keys = [...arr.keys()]
    for(let key in  keys){
        if(arr.findIndex(n => n==(Number(key) +1))+1 == arr[Number(key)])
            c++;
    }
    if(Number(c)==arr.length )
        console.log("YES");
    else
        console.log("NO");
}

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     + 0 comments

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     + 0 comments

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     + 0 comments

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  • dawn2dusk
     + 0 comments

    php solution because why not...

    $_fp = fopen("php://stdin", "r");

$n = fgets($_fp);
$set = explode(' ', fgets($_fp));
$set = array_combine(range(1, count($set)), $set);
$involution = true;

foreach ($set as $k => $v) {
    if ($k !== intval($set[$v])) {
        $involution = false;
        break;
    }
}

echo ($involution ? "YES" : "NO") . PHP_EOL;