Submission #545929

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
545929	2022-04-05 16:12:01	rainboy	Building Skyscrapers (CEOI19_skyscrapers)	C11	100 / 100	338 ms	35516 KiB

skyscrapers

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#include <stdio.h>
#include <string.h>
#define N 150000
int min(int a, int b) { return a < b ? a : b; }
unsigned int X = 12345;
int rand_() {
  return (X *= 3) >> 1;
}
int dx[] = { 0, 1, 0, -1, -1, 1, 1, -1 };
int dy[] = { 1, 0, -1, 0, 1, 1, -1, -1 };
int xx[N], yy[N];
void sort(int *ii, int l, int r) {
  while (l < r) {
    int i = l, j = l, k = r, i_ = ii[l + rand_() % (r - l)], tmp;
    while (j < k)
      if (ii[j] == i_)
        j++;
      else if (xx[ii[j]] < xx[i_] || xx[ii[j]] == xx[i_] && yy[ii[j]] < yy[i_]) {
        tmp = ii[i], ii[i] = ii[j], ii[j] = tmp;
        i++, j++;
      } else {
        k--;
 
 
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Compilation message (stderr)

skyscrapers.c: In function 'sort':
skyscrapers.c:26:55: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   26 |    else if (xx[ii[j]] < xx[i_] || xx[ii[j]] == xx[i_] && yy[ii[j]] < yy[i_]) {
      |                                   ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
skyscrapers.c: In function 'main':
skyscrapers.c:161:53: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  161 |    while (j < n && (xx[ii[j]] < x || xx[ii[j]] == x && yy[ii[j]] < y))
      |                                      ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
skyscrapers.c:164:35: warning: suggest parentheses around arithmetic in operand of '^' [-Wparentheses]
  164 |     join(ii[i] * 8 + h, ii[j] * 8 + h ^ 2);
      |                         ~~~~~~~~~~^~~
skyscrapers.c:150:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  150 |  scanf("%d%d", &n, &t);
      |  ^~~~~~~~~~~~~~~~~~~~~
skyscrapers.c:152:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
  152 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 8 / 8
• Subtask 2: 14 / 14
• Subtask 3: 12 / 12
• Subtask 4: 17 / 17
• Subtask 5: 20 / 20
• Subtask 6: 10 / 10
• Subtask 7: 19 / 19