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export default function combinationSum2(    candidates: number[],    target: number,): number[][] {    candidates.sort((a, b) => -b + a);    const ans: number[][] = [];
    dfs(candidates, target, [], function (path: number[]) {        return ans.push(path);    });    return ans;}
function dfs(    candidates: number[],    target: number,    path: number[],    output: (path: number[]) => void,) {    if (target === 0) {        output(path);        return;    }
    for (const [index, can] of candidates.entries()) {        if (target >= can) {            if (                !(                    candidates[index - 1] &&                    candidates[index] === candidates[index - 1]                )            ) {                dfs(                    candidates.slice(index + 1),                    target - can,                    [...path, can],                    output,                );            }        } else {            return;        }    }}