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-rw-r--r--python/somme.py42
1 files changed, 42 insertions, 0 deletions
diff --git a/python/somme.py b/python/somme.py
new file mode 100644
index 0000000..79e928c
--- /dev/null
+++ b/python/somme.py
@@ -0,0 +1,42 @@
+def sequenza(n, pollatz, tCollatz = -1):
+ tot = 1
+
+ if pollatz:
+ m = 5
+ else:
+ m = 3
+
+ pari = lambda n: ((n % 2) == 0)
+
+ while n != 1:
+ if pari(n):
+ n /= 2
+ else:
+ n = n*m+1
+
+ tot += 1
+
+ if tCollatz != -1 and tot > tCollatz:
+ break
+
+
+ return tot
+
+
+with open('input.txt') as fin:
+ N = fin.readline().split(' ')
+
+
+N[0] = int(N[0])
+N[1] = int(N[1])
+
+tot = 0
+
+for i in range(N[0], N[1]+1):
+ collatz = sequenza(i, False)
+
+ if sequenza(i, True, collatz) < collatz:
+ tot += 1
+
+with open('output.txt', 'w') as fout:
+ fout.write(str(tot)) \ No newline at end of file