upload

Author: whd

435 Non-overlapping Intervals .cpp

@@ -0,0 +1,24 @@
+/**
+ * Definition for an interval.
+ * struct Interval {
+ *     int start;
+ *     int end;
+ *     Interval() : start(0), end(0) {}
+ *     Interval(int s, int e) : start(s), end(e) {}
+ * };
+ */
+class Solution {
+public:
+    int eraseOverlapIntervals(vector<Interval>& intervals) {
+        sort(begin(intervals), end(intervals), [] (const Interval &a, const Interval &b) {return a.end < b.end;});
+        int last = -0x7fffffff - 1;
+        int ans = 0;
+        for (auto &interval : intervals) {
+            if (interval.start >= last) {
+                last = interval.end;
+                ans++;
+            }
+        }
+        return intervals.size() - ans;
+    }
+};