Add more solutions

Added solutions for problems 36, 37, 38, 39 and 40 in python and C

Python/p036.py

@@ -0,0 +1,23 @@
+#!/usr/bin/python3
+
+from timeit import default_timer
+from projecteuler import is_palindrome
+
+def main():
+    start = default_timer()
+
+    sum_ = 0
+
+    for i in range(1, 1000000):
+        if is_palindrome(i, 10) and is_palindrome(i, 2):
+            sum_ = sum_ + i
+
+    end = default_timer()
+
+    print('Project Euler, Problem 36')
+    print('Answer: {}'.format(sum_))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()

Python/p037.py

@@ -0,0 +1,49 @@
+#!/usr/bin/python3
+
+from timeit import default_timer
+from projecteuler import is_prime
+
+def is_tr_prime(n):
+    if n < 11 or not is_prime(n):
+        return False
+
+    tmp = n // 10
+
+    while tmp > 0:
+        if not is_prime(tmp):
+            return 0
+        tmp = tmp // 10
+
+    i = 10
+    tmp = n % i
+
+    while tmp != n:
+        if not is_prime(tmp):
+            return 0
+        i = i * 10
+        tmp = n % i
+
+    return 1
+
+def main():
+    start = default_timer()
+
+    i = 0
+    n = 1
+    sum_ = 0
+
+    while i < 11:
+        if is_tr_prime(n):
+            sum_ = sum_ + n
+            i = i + 1
+        n = n + 1
+
+    end = default_timer()
+
+    print('Project Euler, Problem 37')
+    print('Answer: {}'.format(sum_))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()

Python/p038.py

@@ -0,0 +1,69 @@
+#!/usr/bin/python3
+
+from numpy import zeros
+
+from timeit import default_timer
+
+def is_pandigital(value, n):
+    i = 0
+
+    digits = zeros(n + 1, int)
+
+    while i < n and value > 0:
+        digit = value % 10
+        digits[digit] = digits[digit] + 1
+        value = value // 10
+        i = i + 1
+
+    if i < n or value > 0:
+        return 0
+
+    if digits[0] != 0:
+        return 0
+
+    for i in range(1, n+1):
+        if digits[i] != 1:
+            return 0
+        i = i + 1
+
+    return 1
+
+def main():
+    start = default_timer()
+
+    max_ = 0
+
+    for i in range(1, 10000):
+        n = 0
+        j = 1
+
+        while 1:
+            tmp = i * j
+            n = n + tmp
+            j = j + 1
+
+            if n > max_ and is_pandigital(n, 9):
+                max_ = n
+            if i * j < 10:
+                n = n * 10
+            elif i * j < 100:
+                n = n * 100
+            elif i * j < 1000:
+                n = n * 1000
+            elif i * j < 10000:
+                n = n * 10000
+            elif i * j < 100000:
+                n = n * 100000
+
+            if n > 987654321:
+                break
+
+    end = default_timer()
+
+    print('Project Euler, Problem 38')
+    print('Answer: {}'.format(max_))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()

Python/p039.py

@@ -0,0 +1,60 @@
+#!/usr/bin/python3
+
+from numpy import zeros
+
+from timeit import default_timer
+
+def main():
+    start = default_timer()
+
+    max_ = 0
+    savedc = zeros(1000, int)
+
+    for p in range(12, 1001):
+        count = 0
+        a = 0
+        b = 0
+        c = 0
+        m = 2
+
+        while m * m < p:
+            for n in range(1, m):
+                a = m * m - n * n
+                b = 2 * m * n
+                c = m * m + n * n
+
+                if a + b + c == p and savedc[c] == 0:
+                    savedc[c] = 1
+                    count = count + 1
+
+                i = 2
+                tmpa = a
+                tmpb = b
+                tmpc = c
+
+                while tmpa + tmpb + tmpc < p:
+                    tmpa = a * i
+                    tmpb = b * i
+                    tmpc = c * i
+
+                    if tmpa + tmpb + tmpc == p and savedc[tmpc] == 0:
+                        savedc[tmpc] = 1
+                        count = count + 1
+
+                    i = i + 1
+
+            m = m + 1
+
+        if count > max_:
+            max_ = count
+            res = p
+
+    end = default_timer()
+
+    print('Project Euler, Problem 39')
+    print('Answer: {}'.format(res))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()

Python/p040.py

@@ -0,0 +1,60 @@
+#!/usr/bin/python3
+
+from numpy import zeros
+
+from timeit import default_timer
+
+def main():
+    start = default_timer()
+
+    digits = zeros(1000005, int)
+    i = 1
+    value = 1
+
+    while i <= 1000000:
+        if value < 10:
+            digits[i-1] = value
+            i = i + 1
+        elif value < 100:
+            digits[i-1] = value / 10
+            digits[i] = value % 10
+            i = i + 2
+        elif value < 1000:
+            digits[i-1] = value / 100
+            digits[i] = (value / 10) % 10
+            digits[i+1] = value % 10
+            i = i + 3
+        elif value < 10000:
+            digits[i-1] = value / 1000
+            digits[i] = (value / 100) % 10
+            digits[i+1] = (value / 10) % 10
+            digits[i+2] = value % 10
+            i = i + 4
+        elif value < 100000:
+            digits[i-1] = value / 10000
+            digits[i] = (value / 1000) % 10
+            digits[i+1] = (value / 100) % 10
+            digits[i+2] = (value / 10) % 10
+            digits[i+3] = value % 10
+            i = i + 5
+        elif value < 1000000:
+            digits[i-1] = value / 100000
+            digits[i] = (value / 10000) % 10
+            digits[i+1] = (value / 1000) % 10
+            digits[i+2] = (value / 100) % 10
+            digits[i+3] = (value / 10) % 10
+            digits[i+4] = value % 10
+            i = i + 6
+        value = value + 1
+
+    n = digits[0] * digits[9] * digits[99] * digits[999] * digits[9999] * digits[99999] * digits[999999]
+
+    end = default_timer()
+
+    print('Project Euler, Problem 40')
+    print('Answer: {}'.format(n))
+
+    print('Elapsed time: {:.9f} seconds'.format(end - start))
+
+if __name__ == '__main__':
+    main()