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#include <stdio.h> int rek(int x) { if(x == 0) { return 0; } int cifra = x % 10; if(cifra <= 4) { cifra++; } else { cifra--; } return rek(x / 10) * 10 + cifra; } int main () { int n; scanf("%d", &n); printf("%d\n", rek(n)); return 0; } // rek(123456) = rek(12345) * 10 + 5 = 23454 * 10 + 5 = 234545 // rek(12345) = rek(1234) * 10 + 4 = 2345 * 10 + 4 = 23454 // rek(1234) = rek(123) * 10 + 5 = 234 * 10 + 5 = 2345 // rek(123) = rek(12) * 10 + 4 = 23 * 10 + 4 = 234 // rek(12) = rek(1) * 10 + 3 = 2 * 10 + 3 = 23 // rek(1) = rek(0) * 10 + 2 = 2 // rek(0) = 0
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