Merge pull request #85 from hegdenaveen1/patch-12

Added Numeric String Sort

NumericStringSort.cpp

@@ -0,0 +1,64 @@
+//Using general algorithms to sort a collection of strings results in alphanumeric sort.
+//If it is a numeric string, it leads to unnatural sorting
+
+//eg, an array of strings 1,10,100,2,20,200,3,30,300
+//would be sorted in that same order by using conventional sorting,
+//even though we know the correct sorting order is 1,2,3,10,20,30,100,200,300
+
+//This Programme uses a comparator to sort the array in Numerical order instead of Alphanumeric order
+
+
+#include<iostream>
+#include<string>
+#include<algorithm>
+using namespace std;
+
+bool NumericSort(string a,string b)
+{
+  while(a[0]=='0')
+  {
+    a.erase(a.begin());
+  }
+  while(b[0]=='0')
+  {
+    b.erase(b.begin());
+  }  
+    int n=a.length();
+    int m=b.length();
+  if(n==m)
+    return a<b;
+  return n<m;
+}
+
+int main()
+{
+
+int n;
+cout << "Enter number of elements to be sorted Numerically\n";
+cin >> n;
+
+vector<string> v(n);
+cout << "Enter the string of Numbers\n";
+for(int i=0;i<n;i++)
+{
+cin >> v[i];
+}
+
+sort(v.begin(),v.end());
+cout << "Elements sorted normally \n";
+for(int i=0;i<n;i++)
+{
+cout << v[i] << " ";
+}
+cout << "\n";
+
+sort(v.begin(),v.end(),NumericSort);
+cout << "Elements sorted Numerically \n";
+for(int i=0;i<n;i++)
+{
+cout << v[i] << " ";
+}
+
+
+return 0;
+}