Submission #100423

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
100423	2019-03-11 06:37:29	tnbs10	Lun (COCI19_lun)	Cpython 3	50 / 50	34 ms	3428 KiB

lun

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n = int(input())
s = list(input())
for i in range(n):
    if s[i].isdigit():
        s[i] = int(s[i])
s.reverse()
x = s.index("x")
for i in range(10):
    a = s[:]
    a[x] = i
    zbroj = 0
    for j in range(1, n):
        if j % 2:
            a[j] = a[j] * 2
            if a[j] >= 10:
                a[j] = a[j] % 10 + a[j] // 10
        zbroj += a[j]
    if (zbroj * 9) % 10 == a[0]:
        print(i)
        break
 
 
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• Subtask 1: 50 / 50