Function isKEqual

javascript/0678-valid-parenthesis-string.js:92–92

(k, i, size)

var isOpened = (char) => char === '(';
var isClosed = (char) => char === ')';
const isKEqual = (k, i, size) => k === i + size;
const isDP = (dp, i, k) => dp[i][k];

/**