Merge pull request #301 from ameycodes/master

Author: abranhe

algorithms/greedy/minimumCoins.cpp

@@ -0,0 +1,41 @@
+// Given a value V and the list of available denomination of money,
+// find minimum number of coins and/or notes needed to make the change.
+
+#include <bits/stdc++.h>
+using namespace std;
+
+// All denominations of Indian Currency
+int deno[] = { 1, 2, 5, 10, 20,
+			50, 100, 500, 1000 };
+int n = sizeof(deno) / sizeof(deno[0]);
+
+vector<int> calculate(int V)
+{
+	sort(deno, deno + n);
+	vector<int> ans;
+
+	for (int i = n - 1; i >= 0; i--) {
+
+		while (V >= deno[i]) {
+			V -= deno[i];
+			ans.push_back(deno[i]);
+		}
+	}
+	return ans;
+	//for (int i = 0; i < ans.size(); i++)
+		//cout << ans[i] << " ";
+}
+
+int main()
+{
+	int n;
+	cout<<"Enter the monitory value: ";
+	cin>>n;
+	cout << "Following is minimal number of change for " << n
+		<< ": ";
+    vector<int> ans = calculate(n);
+	for(auto i: ans)
+        cout<<i<<" ";
+	cout<<"\nMinimum Denominations required: "<<ans.size();
+	return 0;
+}

algorithms/greedy/minimumProductSubset.cpp

@@ -0,0 +1,59 @@
+//Find minimum product subset in an array using Greedy method
+
+#include <bits/stdc++.h>
+using namespace std;
+
+int calculate(int a[], int n)
+{
+	if (n == 1)
+		return a[0];
+
+	int max_neg = INT_MIN;
+	int min_pos = INT_MAX;
+	int count_neg = 0, count_zero = 0;
+	int prod = 1;
+	for (int i = 0; i < n; i++) {
+
+
+		if (a[i] == 0) {
+			count_zero++;
+			continue;
+		}
+
+		if (a[i] < 0) {
+			count_neg++;
+			max_neg = max(max_neg, a[i]);
+		}
+
+		if (a[i] > 0)
+			min_pos = min(min_pos, a[i]);
+
+		prod = prod * a[i];
+	}
+
+	if (count_zero == n ||
+	(count_neg == 0 && count_zero > 0))
+		return 0;
+
+	if (count_neg == 0)
+		return min_pos;
+
+	if (!(count_neg & 1) && count_neg != 0) {
+		prod = prod / max_neg;
+	}
+
+	return prod;
+}
+
+int main()
+{
+	int n;
+	cout<<"Enter size of array: ";
+	cin>>n;
+	int a[n];
+	cout<<"\nEnter array elements: ";
+	for(int i=0;i<n;i++)
+	    cin>>a[i];
+	cout << "\nAnswer: "<<calculate(a, n);
+	return 0;
+}