Submission #631748

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
631748	2022-08-18 15:54:11	rainboy	Thousands Islands (IOI22_islands)	C++17	100 / 100	100 ms	22472 KiB

islands

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#include "islands.h"
#include <variant>
#include <vector>
#include <stdlib.h>
#include <string.h>
using namespace std;
typedef vector<int> vi;
typedef variant<bool, vi> vbvi;
const int N = 100000, M = 200000;
int ij[M];
int *eh[N], eo[N], eo_[N], *fh[N], fo[N]; char deleted[N];
void append(int **eh, int *eo, int i, int h) {
  int o = eo[i]++;
  if (o >= 2 && (o & o - 1) == 0)
    eh[i] = (int *) realloc(eh[i], o * 2 * sizeof *eh[i]);
  eh[i][o] = h;
}
void dfs(int j) {
  if (deleted[j] || eo_[j])
    return;
  deleted[j] = 1;
  for (int o = fo[j]; o--; ) {
    int h = fh[j][o], i = j ^ ij[h];
    eo_[i]--, dfs(i);
 
 
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Compilation message (stderr)

islands.cpp: In function 'void append(int**, int*, int, int)':
islands.cpp:19:23: warning: suggest parentheses around '-' in operand of '&' [-Wparentheses]
   19 |  if (o >= 2 && (o & o - 1) == 0)
      |                     ~~^~~

• Subtask 1: 5 / 5
• Subtask 2: 5 / 5
• Subtask 3: 21 / 21
• Subtask 4: 24 / 24
• Subtask 5: 45 / 45