mergeOverlappingIntervals.cpp

Arrays/mergeOverlappingIntervals.cpp

@@ -0,0 +1,53 @@
+#include <bits/stdc++.h>
+using namespace std;
+/**
+ * Definition for an interval.
+ * struct Interval {
+ *     int start;
+ *     int end;
+ *     Interval() : start(0), end(0) {}
+ *     Interval(int s, int e) : start(s), end(e) {}
+ * };
+ */
+vector<Interval> Solution::merge(vector<Interval> &A) {
+    // Do not write main() function.
+    // Do not read input, instead use the arguments to the function.
+    // Do not print the output, instead return values as specified
+    // Still have a doubt. Checkout www.interviewbit.com/pages/sample_codes/ for more details
+    int i,n=A.size();
+    pair<int,int>p[n];
+    for(i=0;i<n;i++){
+        p[i]=make_pair(A[i].start,A[i].end);
+    }
+    sort(p,p+n);
+        stack<pair<int,int>>s;
+        s.push(p[0]);
+        for(i=1;i<n;i++){
+            if(s.top().second<p[i].first){
+                s.push(p[i]);
+            }
+            else{
+                if(p[i].second>s.top().second){
+                    pair<int,int>t=s.top();
+                    s.pop();
+                    t.second=p[i].second;
+                    s.push(t);
+                }
+            }
+        }
+        vector<pair<int,int>>v;
+        while(!s.empty()){
+            v.push_back(s.top());
+            s.pop();
+        }
+        sort(v.begin(),v.end());
+        int m=v.size();
+        A.clear();
+        for(i=0;i<m;i++){
+            Interval ine;
+            ine.start=v[i].first;
+            ine.end=v[i].second;
+            A.push_back(ine);
+        }
+        return A;
+}