Submission #479384

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
479384	2021-10-11 14:39:48	rainboy	Lun (COCI19_lun)	C11	50 / 50	1 ms	280 KiB

lun

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#include <stdio.h>
#define N 100
int f(int d) {
  return d < 5 ? d * 2 : (d - 5) * 2 + 1;
}
int g(int d) {
  return d % 2 == 0 ? d / 2 : d / 2 + 5;
}
int main() {
  static char cc[N + 1];
  int n, i, i_, d;
  scanf("%d%s", &n, cc);
  d = 0, i_ = -1;
  for (i = n - 1; i >= 0; i--)
    if (cc[i] != 'x')
      d = (d + ((n - i) % 2 == 0 ? f(cc[i] - '0') : cc[i] - '0')) % 10;
    else
      i_ = i;
  d = (10 - d) % 10;
  if ((n - i_) % 2 == 0)
    d = g(d);
  printf("%d\n", d);
  return 0;
}
 
 
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Compilation message (stderr)

lun.c: In function 'main':
lun.c:17:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   17 |  scanf("%d%s", &n, cc);
      |  ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 50 / 50