From 96536ad7617dadb74b89a8ebc14cc239f8f3b294 Mon Sep 17 00:00:00 2001
From: Erdenezul <erdenezul@shine.mn>
Date: Wed, 25 Oct 2017 09:56:48 +0800
Subject: [PATCH 1/2] add coin change problem

---
 dynamic_programming/coin_change.py | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 dynamic_programming/coin_change.py

diff --git a/dynamic_programming/coin_change.py b/dynamic_programming/coin_change.py
new file mode 100644
index 000000000..a8af4d5cc
--- /dev/null
+++ b/dynamic_programming/coin_change.py
@@ -0,0 +1,25 @@
+"""
+You have m types of coins available in infinite quantities
+where the value of each coins is given in the array S=[S0,... Sm-1]
+Can you determine number of ways of making change for n units using
+the given types of coints?
+https://www.hackerrank.com/challenges/coin-change/problem
+"""
+def dp_count(S, m, n):
+    table = [0] * (n + 1)
+
+    # Base case (If given value is 0)
+    table[0] = 1
+
+    # Pick all coins one by one and update table[] values
+    # after the index greater than or equal to the value of the
+    # picked coin
+    for i in range(0, m):
+        for j in range(S[i], n + 1):
+            table[j] += table[j - S[i]]
+
+    return table[n]
+
+if __name__ == '__main__':
+    print dp_count([1, 2, 3], 3, 4)  # answer 4
+    print dp_count([2, 5, 3, 6], 4, 10)  # answer 5

From 53ce9b806813ec253aaf6750c595d026fb84a434 Mon Sep 17 00:00:00 2001
From: Erdenezul <erdenezul@shine.mn>
Date: Wed, 25 Oct 2017 15:58:46 +0800
Subject: [PATCH 2/2] fix typo

---
 dynamic_programming/coin_change.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dynamic_programming/coin_change.py b/dynamic_programming/coin_change.py
index a8af4d5cc..dca016359 100644
--- a/dynamic_programming/coin_change.py
+++ b/dynamic_programming/coin_change.py
@@ -2,7 +2,7 @@
 You have m types of coins available in infinite quantities
 where the value of each coins is given in the array S=[S0,... Sm-1]
 Can you determine number of ways of making change for n units using
-the given types of coints?
+the given types of coins?
 https://www.hackerrank.com/challenges/coin-change/problem
 """
 def dp_count(S, m, n):