Submission #484596

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
484596	2021-11-04 14:54:42	rainboy	Geometrija (COCI21_geometrija)	C11	110 / 110	639 ms	344 KiB

geometrija

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#include <stdio.h>
#define N 1000
unsigned int X = 12345;
int rand_() {
  return (X *= 3) >> 1;
}
long long cross2(int x1, int y1, int x2, int y2) {
  return (long long) x1 * y2 - (long long) x2 * y1;
}
int xx[N], yy[N], n, o;
long long cross(int i, int j, int k) {
  return cross2(xx[j] - xx[i], yy[j] - yy[i], xx[k] - xx[i], yy[k] - yy[i]);
}
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) {
      long long c = cross(o, ii[j], i_);
      if (c == 0)
        j++;
      else if (c < 0) {
 
 
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Compilation message (stderr)

geometrija.c: In function 'main':
geometrija.c:81:50: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
   81 |   if (o == -1 || xx[o] > xx[i] || xx[o] == xx[i] && yy[o] > yy[i])
      |                                   ~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~
geometrija.c:77:2: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   77 |  scanf("%d", &n);
      |  ^~~~~~~~~~~~~~~
geometrija.c:80:3: warning: ignoring return value of 'scanf' declared with attribute 'warn_unused_result' [-Wunused-result]
   80 |   scanf("%d%d", &xx[i], &yy[i]);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 30 / 30
• Subtask 3: 60 / 60