Submission #396744

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
396744	2021-04-30 17:08:40	rainboy	Sorting (IOI15_sorting)	C11	100 / 100	336 ms	19672 KiB

sorting

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#include "sorting.h"
#include <string.h>
#define N 200000
int findSwapPairs(int n, int pp[], int m, int aa[], int bb[], int ii[], int jj[]) {
  static char visited[N];
  static int vv[N];
  int h, i, j, r, p, q, u, v, lower, upper, cnt;
  for (i = 0; i < n; i++)
    vv[pp[i]] = i;
  lower = -1, upper = m;
  while (upper - lower > 1) {
    r = (lower + upper) / 2;
    for (h = 0; h < r; h++) {
      p = pp[aa[h]], q = pp[bb[h]], u = aa[h], v = bb[h];
      pp[v] = p, vv[p] = v, pp[u] = q, vv[q] = u;
    }
    memset(visited, 0, n * sizeof *visited);
    cnt = 0;
    for (i = 0; i < n; i++)
      if (!visited[i]) {
        visited[i] = 1;
        for (j = pp[i]; !visited[j]; j = pp[j])
          visited[j] = 1, cnt++;
      }
    for (h = r - 1; h >= 0; h--) {
      p = pp[aa[h]], q = pp[bb[h]], u = aa[h], v = bb[h];
      pp[v] = p, vv[p] = v, pp[u] = q, vv[q] = u;
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

sorting.c: In function 'findSwapPairs':
sorting.c:20:24: warning: conversion to 'long unsigned int' from 'int' may change the sign of the result [-Wsign-conversion]
   20 |   memset(visited, 0, n * sizeof *visited);
      |                        ^
sorting.c:42:23: warning: conversion to 'long unsigned int' from 'int' may change the sign of the result [-Wsign-conversion]
   42 |  memset(visited, 0, n * sizeof *visited);
      |                       ^

• Subtask 1: 8 / 8
• Subtask 2: 12 / 12
• Subtask 3: 16 / 16
• Subtask 4: 18 / 18
• Subtask 5: 20 / 20
• Subtask 6: 26 / 26