Submission #869815

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
869815	2023-11-05 18:08:49	rainboy	Subway (info1cup19_subway)	C11	100 / 100	5 ms	860 KiB

subway

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#include <stdio.h>
int main() {
  int n, m, i;
  scanf("%d", &m);
  n = 1;
  while (n * (n - 1) / 2 < m)
    n++;
  printf("%d\n", n);
  for (i = 0; i < n - 1; i++)
    printf("%d %d\n", i, i - 1);
  printf("%d %d\n", n - 1, m - 1 - (n - 1) * (n - 2) / 2);
  return 0;
}
 
 
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Compilation message (stderr)

subway.c: In function 'main':
subway.c:6:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
    6 |  scanf("%d", &m);
      |  ^~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 50 / 50