reorganize dir

Signed-off-by: Mia Steinkirch <mia.steinkirch@gmail.com>

other_resources/Project-Euler/004-larg_palindrome.py

@@ -0,0 +1,47 @@
+#!/usr/bin/python3
+# mari von steinkirch @2013
+# steinkirch at gmail
+
+
+
+def is_palindrome(s):
+    return s == reverse(s)
+
+def reverse(s):
+    rev = 0
+    while s > 0:
+        rev = 10*rev + s%10
+        s = s//10
+    return rev
+
+
+def is_palindrome_2(s):
+    # to use it you need to cast str() first
+    while s:
+        if s[0] != s[-1]: return False
+        else:
+            s = s[1:-1] 
+            is_palindrome(s)
+    return True
+
+
+def larg_palind_product(n):
+    nmax, largpal = 9, 0
+    for i in range(1, n):
+       nmax += 9*10**i
+    for i in range(nmax, nmax//2, -1):
+        for j in range(i -1, (i -1)//2, -1):
+            candidate = i*j
+            if is_palindrome(candidate) and candidate > largpal:
+                largpal = candidate
+    return largpal
+
+
+def test_larg_palind_product():
+    assert(larg_palind_product(2)== 9009)
+    print(larg_palind_product(3))
+    print('Tests Passed!')
+            
+if __name__ == '__main__':
+    test_larg_palind_product()
+