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187 Repeated DNA Sequences.js

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// All DNA is composed of a series of nucleotides abbreviated as A, C, G, and T, for example: "ACGAATTCCG". When studying DNA, it is sometimes useful to identify repeated sequences within the DNA.

// Write a function to find all the 10-letter-long sequences (substrings) that occur more than once in a DNA molecule.

// For example,

// Given s = "AAAAACCCCCAAAAACCCCCCAAAAAGGGTTT",

// Return:

// ["AAAAACCCCC", "CCCCCAAAAA"].

// Hide Company Tags LinkedIn

// Hide Tags Hash Table Bit Manipulation

/**

* @param {string} s

* @return {string[]}

*/

var findRepeatedDnaSequences = function(s) {

var hash = {};

var result = [];

for(var i = 10; i <= s.length; i++) {

var substr = s.substring(i - 10, i);

if(hash[substr] === undefined) {

hash[substr] = 1;

} else if(hash[substr] === 1) {

hash[substr]++;

result.push(substr);

}

}

return result;

};