LC436.FindRightInterval

class Solution {
public:
    vector<int> findRightInterval(vectorint>>& intervals) {
        map<int, int> hash;
        vector<int> res;
        int n = intervals.size();
        for (int i = 0; i i) {
            hash[intervals[i][0]] = i;
        }
        for (auto& in : intervals) {
            auto it = hash.lower_bound(in[1]);
            if (it == hash.end()) res.push_back(-1);
            else res.push_back(it->second);
        }
        return res;
    }
};