[LeetCode] Merge Intervals
2014-10-23 10:28
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Given a collection of intervals, merge all overlapping intervals.
For example,
Given
return
For example,
Given
[1,3],[2,6],[8,10],[15,18],
return
[1,6],[8,10],[15,18].
/** * Definition for an interval. * struct Interval { * int start; * int end; * Interval() : start(0), end(0) {} * Interval(int s, int e) : start(s), end(e) {} * }; */ bool cmp(const Interval &a, const Interval &b) { return a.start < b.start; } class Solution { public: vector<Interval> merge(vector<Interval> &intervals) { sort(intervals.begin(), intervals.end(), cmp); vector<Interval> res; if(intervals.empty()) return res; vector<Interval>::iterator it = intervals.begin(); Interval temp = *it++; if(it == intervals.end()) res.push_back(temp); else { while(it != intervals.end()) { while((*it).start <= temp.end && it != intervals.end()) { temp.end = max(temp.end, (*it).end); ++it; } res.push_back(temp); temp = *it; } } return res; } };
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