Submission #924804

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
924804	2024-02-09 17:39:31	rainboy	트리 (KOI16_tree)	C11	100 / 100	160 ms	34380 KiB

tree

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#include <stdio.h>
#include <stdlib.h>
#define N 200000
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 dd[N], pp[N], qq[N], ta[N], tb[N];
int dfs1(int i, int d) {
  int o, s, k_, j_;
  dd[i] = d;
  s = 1, k_ = 0, j_ = -1;
  for (o = eo[i]; o--; ) {
    int j = ej[i][o], k = dfs1(j, d + 1);
    s += k;
    if (k_ < k)
      k_ = k, j_ = j;
  }
  qq[i] = j_;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

tree.c: In function 'append':
tree.c:11:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   11 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
tree.c: In function 'main':
tree.c:83:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   83 |  scanf("%d%d", &n, &q);
      |  ^~~~~~~~~~~~~~~~~~~~~
tree.c:87:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   87 |   scanf("%d", &pp[i]), pp[i]--;
      |   ^~~~~~~~~~~~~~~~~~~
tree.c:95:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   95 |   scanf("%d%d%d", &i, &j, &upd), i--, j--;
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 9 / 9
• Subtask 2: 13 / 13
• Subtask 3: 14 / 14
• Subtask 4: 19 / 19
• Subtask 5: 45 / 45