Solution.ts

function combinationSum2(candidates: number[], target: number): number[][] {
    candidates.sort((a, b) => a - b);
    const ans: number[][] = [];
    const t: number[] = [];
    const dfs = (i: number, s: number) => {
        if (s === 0) {
            ans.push(t.slice());
            return;
        }
        if (i >= candidates.length || s < candidates[i]) {
            return;
        }
        for (let j = i; j < candidates.length; j++) {
            if (j > i && candidates[j] === candidates[j - 1]) {
                continue;
            }
            t.push(candidates[j]);
            dfs(j + 1, s - candidates[j]);
            t.pop();
        }
    };
    dfs(0, target);
    return ans;
}