Submission #412225

#TimeUTC-0UsernameProblemLanguageResultExecution timeMemory
4122252021-05-26 15:51:09rainboyTraffic (IOI10_traffic)C11
100 / 100
845 ms144052 KiB
#include "traffic.h"
#include <stdlib.h>
#define N 1000000
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 sz[N], sum, c;
void dfs(int p, int i) {
int o;
for (o = eo[i]; o--; ) {
int j = ej[i][o];
if (j != p) {
dfs(i, j);
sz[i] += sz[j];
}
}
if (sz[i] >= (sum + 1) / 2 && (c == -1 || sz[c] > sz[i]))
c = i;
 
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Compilation message (stderr)

traffic.c: In function 'append':
traffic.c:11:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   11 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~
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