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();
}

"WTF. I created a monster =) "What have I created?!""

int designerPdfViewer(vector h, string word) { int len = word.size(); vector gg;

char maxac = 'a';
for (int i = 0; i < len; i++) {
    if (maxac < word[i]) {
        maxac = word[i];
    }
}

string pp = "abcdefghijklmnopqrstuvwxyz";
int chet = 0;
char bb = 'a';
int hp;

for (int i = 0; i < h.size(); i++) {
    if (bb == maxac) {
        gg.push_back(h[i]);
        sort(gg.begin(), gg.end());

        hp = len * gg[gg.size() - 1];
        break;
    }
    else {
        bb++;
        gg.push_back(h[i]);
    }
}
return hp;

}

def designerPdfViewer(h, word): a = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'] letters_height=[] word=list(word) for i in range(len(word)): for j in range(len(a)): if word[i]==a[j]: letters_height.append(h[j]) return max(letters_height)*len(word)

def designerPdfViewer(h, word):

a = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
letters_height=[]

word=list(word)
for i in range(len(word)):
    for j in range(len(a)):
        if word[i]==a[j]:
            letters_height.append(h[j])
return max(letters_height)*len(word)

def designerPdfViewer(h, word):

a = ['a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z']
letters_height=[]

word=list(word)

for i in range(len(word)):
    for j in range(len(a)):
        if word[i]==a[j]:
            letters_height.append(h[j])
return max(letters_height)*len(word)