2486-append-characters-to-string-to-make-subsequence

DevGod

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Caution

DevGod needs to write an editorial for this problem!

js

/**
 * @param {string} s
 * @param {string} t
 * @return {number}
 */
var appendCharacters = function(s, t) {
    let L = 0;
    let R = 0;

    while(L<s.length){
        if(s[L] === t[R]){
            L++;
            R++;
        }else{
            L++;
        }
    }

    return t.length-R;
};