Here is my c++ solution, you can watch the explanation here : https://youtu.be/tRUU2pSf8fI

int designerPdfViewer(vector<int> h, string word) {
    int mx = 0;
    for(int el : word) if(h[el - 'a'] > mx) mx = h[el - 'a'];
    return mx * 1 * word.size();
}

Kotlin:

fun designerPdfViewer(h: Array<Int>, word: String): Int {
    var max=0
    word.forEach { 
        var count=0
        for(i in 'a'..'z'){
            if(it==i){
                if(h[count]>max) max=h[count]
                break
            }
            count++
        }
     }
     return word.length*max
}

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Python with one line

def designerPdfViewer(h, word):
    return len(word) * max([h[ord(_) - ord('a')] for _ in word])