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largestVariance.js
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largestVariance.js
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const _largestVariance = (s, alphabet, charsSet) => {
let maxVariance = 0;
for (let i = 0; i < alphabet.length; i++) {
for (let j = 0; j < alphabet.length; j++) {
const [char1, char2] = [alphabet[i], alphabet[j]];
if (char1 === char2 || (!charsSet.has(char1) && !charsSet.has(char2)))
continue;
let [freq1, freq2] = [0, 0];
let diffSofar = 0;
for (let k = 0; k < s.length; k++) {
if (char1 === s[k]) {
diffSofar++;
freq1++;
} else if (char2 === s[k]) {
diffSofar--;
freq2++;
} else {
continue;
}
if (freq2 > freq1) {
diffSofar = 0;
freq1 = 0;
freq2 = 0;
continue;
}
if (diffSofar && freq1 && freq2) {
maxVariance = Math.max(maxVariance, diffSofar);
}
}
}
}
return maxVariance;
};
/**
* @param {string} s
* @return {number}
*/
var largestVariance = function (s) {
const alphabet = [...Array(26)].map((_) => (++i).toString(36), (i = 9));
const charsSet = new Set(s);
return Math.max(
_largestVariance(s, alphabet, charsSet),
_largestVariance(s.split("").reverse().join(""), alphabet, charsSet)
);
};
// console.log(largestVariance("lripaa"));
// console.log(largestVariance("lripaa".split("").reverse().join("")));
console.log(largestVariance("lripaa") === 1);
console.log(largestVariance("abcde") === 0);
console.log(largestVariance("aababbb") === 3);
// console.log(largestVariance("aababbb"));
console.log(largestVariance("bbacccabab") === 2);
console.log(largestVariance("aaaaab") === 4);