Function isDP

javascript/0678-valid-parenthesis-string.js:93–93

(dp, i, k)

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

/**
 * Time O(N) | Space O(1)