Submission #494170

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
494170	2021-12-14 14:10:43	rainboy	Newspapers (CEOI21_newspapers)	C11	100 / 100	1 ms	332 KiB

newspapers

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/* https://csacademy.com/contest/archive/task/catch-the-thief */
#include <stdio.h>
#include <stdlib.h>
#define N 1000
int *ej[N], eo[N];
void append(int i, int j) {
  int o = eo[i]++;
  if (o >= 2 && (o & o - 1) == 0)
    ej[i] = (int *) realloc(ej[i], o * 2 * sizeof *ej[i]);
  ej[i][o] = j;
}
int pp[N], i_, d_;
void dfs1(int p, int i, int d) {
  int o;
  pp[i] = p;
  if (d_ < d)
    i_ = i, d_ = d;
  for (o = eo[i]; o--; ) {
    int j = ej[i][o];
    if (j != p)
      dfs1(i, j, d + 1);
  }
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

newspapers.c: In function 'append':
newspapers.c:12:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   12 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
newspapers.c: In function 'main':
newspapers.c:53:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   53 |  scanf("%d%d", &n, &m);
      |  ^~~~~~~~~~~~~~~~~~~~~
newspapers.c:73:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |   scanf("%d%d", &i, &j), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 12 / 12
• Subtask 2: 8 / 8
• Subtask 3: 80 / 80