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solution.ts
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solution.ts
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function totalFruit (fruits: number[]): number {
let a = -1;
let b = -1;
let lastA = -1;
let lastB = -1;
let left = 0;
let right = 0;
for (let i = 0; i < fruits.length; i++) {
if (a === -1) {
a = fruits[i];
lastA = i;
} else if (fruits[i] === a) {
lastA = i;
} else if (b === -1) {
b = fruits[i];
lastB = i;
right = i;
break;
}
}
if (right === 0) {
return fruits.length;
}
let result = right;
while (right < fruits.length) {
while (right < fruits.length && (fruits[right] === a || fruits[right] === b)) {
if (fruits[right] === a) {
lastA = right;
} else {
lastB = right;
}
result = Math.max(result, right - left + 1);
right++;
}
if (right < fruits.length) {
if (fruits[right - 1] === a) {
b = fruits[right];
left = lastB + 1;
lastB = right;
} else {
a = fruits[right];
left = lastA + 1;
lastA = right;
}
}
}
return result;
}