LeetCode 352. Data Stream as Disjoint Intervals

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class SummaryRanges {
    map<int, int> m;
public:
    SummaryRanges() {}
    
    void addNum(int val) {
        int left = val, right = val;
        for (auto it = m.lower_bound(val - 1); it != m.end() && it->second <= right + 1; m.erase(it++)) {
            int l = it->second, r = it->first;
            left = min(left, l), right = max(right, r);
        }
        m[right] = left;
    }
    
    vector<vector<int>> getIntervals() {
        vector<vector<int>> v;
        for (auto it = m.begin(); it != m.end(); ++it)
            v.push_back({it->second, it->first});
        return v;
    }
};

/**
 * Your SummaryRanges object will be instantiated and called as such:
 * SummaryRanges* obj = new SummaryRanges();
 * obj->addNum(val);
 * vector<vector<int>> param_2 = obj->getIntervals();
 */