1282. 用户分组

代码实现（自解）

class Solution {
public:
    vector<vector<int>> groupThePeople(vector<int>& groupSizes) {
        vector<pair<int, int>> helper;
        for (int i = 0; i < groupSizes.size(); i++) {
            helper.push_back(make_pair(groupSizes[i], i));
        }
        sort(helper.begin(), helper.end());
        int sz = 0, expect = 0;
        vector<vector<int>> ans;
        for (int i = 0; i < helper.size();) {
            sz = 0;
            expect = helper[i].first;
            vector<int> v;
            while (sz++ != expect) {
                v.push_back(helper[i++].second);
            }
            ans.push_back(v);
        }
        return ans;
    }
};
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