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joshguhajoshguha
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Three Sum solution added
1 parent 53b02ec commit a43fe84

11 files changed

+545
-10
lines changed

‎.gitignore

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This file was deleted.

‎11-containerWithMostWater.js

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// Brute force - O(n^2)
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// var maxArea = function (height) {
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// let result = 0;
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// for (let i = 0; i < height.length; i++) {
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// let intermediate = 0;
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// for (let j = i + 1; j < height.length; j++) {
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// let width = j - i;
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// let length = Math.min(height[i], height[j]);
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// let area = width * length;
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// if (area > intermediate) {
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// intermediate = area;
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// }
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// }
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// if (intermediate > result) {
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// result = intermediate;
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// }
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// }
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// return result;
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// };
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// Two Pointer - O(n)
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var maxArea = function (height) {
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let maxArea = 0;
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let i = 0;
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let j = height.length - 1;
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while (i !== j) {
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let area = (j - i) * Math.min(height[i], height[j]);
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if (area > maxArea) maxArea = area;
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if (height[i] < height[j]) {
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i++;
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} else {
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j--;
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}
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}
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return maxArea;
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};
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console.log(maxArea([1, 8, 6, 2, 5, 4, 8, 3, 7]));
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‎12-integerToRoman.js

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var intToRoman = function (num) {
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let result = "";
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let decrementByLetter = (value, letter) => {
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while (num - value >= 0) {
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num -= value;
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result += letter;
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}
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};
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decrementByLetter(1000, "M");
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decrementByLetter(500, "D");
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decrementByLetter(100, "C");
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decrementByLetter(50, "L");
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decrementByLetter(10, "X");
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decrementByLetter(5, "V");
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decrementByLetter(1, "I");
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if (result.includes("IIII")) {
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result = result.slice(0, result.length - 4) + "IV";
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}
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if (result.includes("VIV")) {
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result = result.slice(0, result.length - 3) + "IX";
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}
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if ((result.includes("XXXX"))) {
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result =
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result.slice(0, result.indexOf("X")) +
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"XL" +
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result.slice(result.indexOf("X") + 4, result.length);
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}
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if ((result.includes("XXXX"))) {
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result =
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result.slice(0, result.indexOf("XXXX")) +
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"XL" +
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result.slice(result.indexOf("XXXX") + 4, result.length);
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}
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if ((result.includes("LXL"))) {
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result =
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result.slice(0, result.indexOf("LXL")) +
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"XC" +
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result.slice(result.indexOf("LXL") + 3, result.length);
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}
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if ((result.includes("CCCC"))) {
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result =
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result.slice(0, result.indexOf("CCCC")) +
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"CD" +
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result.slice(result.indexOf("CCCC") + 4, result.length);
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}
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if ((result.includes("DCD"))) {
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result =
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result.slice(0, result.indexOf("DCD")) +
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"CM" +
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result.slice(result.indexOf("DCD") + 3, result.length);
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}
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return result;
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};
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console.log(intToRoman(1994));
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‎13-romanToInteger.js

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var romanToInt = function (s) {
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let arr = s.split("");
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let i = 0;
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let result = 0;
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while (arr[i] != undefined) {
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switch (arr[i]) {
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case "I":
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if (arr[i + 1] === "V") {
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result += 4;
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i++;
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} else if (arr[i + 1] === "X") {
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result += 9;
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i++;
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} else {
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result += 1;
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}
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break;
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case "V":
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result += 5;
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break;
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case "X":
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if (arr[i + 1] === "L") {
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result += 40;
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i++;
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} else if (arr[i + 1] === "C") {
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result += 90;
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i++;
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} else {
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result += 10;
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}
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break;
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case "L":
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result += 50;
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break;
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case "C":
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if (arr[i + 1] === "D") {
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result += 400;
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i++;
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} else if (arr[i + 1] === "M") {
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result += 900;
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i++;
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} else {
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result += 100;
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}
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break;
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case "D":
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result += 500;
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break;
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case "M":
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result += 1000;
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break;
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}
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i++;
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}
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return result;
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};
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console.log(romanToInt("MCMXCIV"));

‎14-longestCommonPrefix.js

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var longestCommonPrefix = function (strs) {
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let test = strs[0];
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let index = 0;
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let result = "";
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console.log(!!test);
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if (strs.length > 0 && !!test) {
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while (true) {
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if (strs.every((word) => word[index] === test[index])) {
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if (test[index]) {
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result += test[index];
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index++;
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} else {
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return result;
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}
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} else {
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return result;
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}
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}
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} else {
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return "";
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}
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};
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console.log(longestCommonPrefix(["a", "a"]));

‎15-threeSum.js

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var threeSum = function (nums) {
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if (nums.length < 3) {
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return [];
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}
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let mergeSort = function (array) {
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if (array.length === 0) {
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return [];
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}
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let merge = function (firstArray, secondArray) {
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let i = 0;
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let j = 0;
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let result = [];
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while (true) {
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if (firstArray[i] < secondArray[j]) {
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result.push(firstArray[i]);
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i++;
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} else {
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result.push(secondArray[j]);
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j++;
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}
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if (i === firstArray.length) {
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return result.concat(
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secondArray.slice(j, secondArray.length)
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);
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} else if (j === secondArray.length) {
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return result.concat(
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firstArray.slice(i, firstArray.length)
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);
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}
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}
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};
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if (array.length === 1) {
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return array;
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}
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const middleIndex = Math.floor(array.length / 2);
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const firstArray = mergeSort(array.slice(0, middleIndex));
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const secondArray = mergeSort(array.slice(middleIndex, array.length));
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const merged = merge(firstArray, secondArray);
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return merged;
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};
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const twoSum = function (sorted, target) {
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if (sorted.length === 0) {
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return [];
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}
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let result = [];
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let i = 0;
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let j = sorted.length - 1;
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while (true) {
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let sum = sorted[i] + sorted[j];
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if (sum > target) {
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j--;
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} else if (sum < target) {
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i++;
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} else {
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let add = true;
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result.forEach((el) => {
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if (el[0] === sorted[i] && el[1] === sorted[j]) {
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add = false;
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}
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});
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if (add) {
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result.push([sorted[i], sorted[j]]);
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}
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i++;
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}
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if (i >= j) {
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return result;
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}
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}
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};
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const sorted = mergeSort(nums);
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let result = [];
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for (let i = 0; i < sorted.length; i++) {
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if (sorted[i] !== sorted[i - 1]) {
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let first = sorted[i];
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// console.log(first);
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let arr = sorted.slice(i + 1);
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// console.log(arr);
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if (arr.length >= 2) {
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answers = twoSum(arr, 0 - first).map((el) => {
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return [first].concat(el);
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});
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// console.log(answers);
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result = result.concat(answers);
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}
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}
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}
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return result;
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};
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console.log(threeSum([-2, -3, 0, 0, -2]));

‎5-longestPalindromicSubstring.js

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var longestPalindrome = function (s) {
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let isPalindrome = function (s) {
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for (let i = 0; i < Math.ceil(s.length / 2); i++) {
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if (s[i] !== s[s.length - 1 - i]) {
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return false;
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}
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}
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return true;
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};
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let testSubstring = function (s, maxLength) {
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for (let j = s.length - 1; j >= 0; j--) {
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if (j + 1 < maxLength) {
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return "";
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}
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if (s[0] === s[j]) {
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const substring = s.slice(0, j + 1);
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if (isPalindrome(substring)) {
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return substring;
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}
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}
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}
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};
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var result = "";
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for (let i = 0; i < s.length; i++) {
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const palindrome = testSubstring(s.slice(i, s.length), result.length);
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if (palindrome.length > result.length) {
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result = palindrome;
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}
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}
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return result;
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};
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console.log(
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longestPalindrome(
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"aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaabcaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"
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)
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);

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