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export default function dailyTemperatures(temperatures: number[]): number[] {    const ans = temperatures.map(() => 0);    const stack: number[] = [];
    for (const [index, temper] of temperatures.entries()) {        let last: number | undefined;        while (            stack.length &&            "number" === typeof (last = stack.at(-1)) &&            temper > temperatures[last]        ) {            ans[last] = index - last;            stack.pop();        }        stack.push(index);    }    return ans;}