Все задачи на 5.10.17 13:00

uts/session_py/dist_march_2k17/Peter.py

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+import sys
+
+sys.stdin = open("input.txt", "r")
+sys.stdout = open("output.txt", "w")
+s = int(input())
+l = 1
+h = int(10e18)
+while l <= h:
+    mid = (l+h)//2
+    x = mid
+    now = mid
+    while x != 0:
+        st = str(x)
+        st = st[:-1]
+        if len(st) == 0:
+            break
+        x = int(st)
+        now += x
+    if now == s :
+        print(mid)
+        quit()
+    elif now < s :
+        l = mid + 1
+    else :
+        h = mid - 1
+print(-1)