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  1. /*
  2.   Copyright 2011 Marek "p2004a" Rusinowski
  3.   Quick sort
  4. */
  5. #include <cstdio>
  6.  
  7. #define MAXN 1000000
  8.  
  9. int array[MAXN];
  10.  
  11. void sort(int *begin, int *end) {
  12.   if (begin + 1 >= end) return;
  13.   int cur = *begin, *front = begin + 1, *back = end - 1;
  14.   while (front <= back) {
  15.     if (*back <= cur) {
  16.       int tmp = *back;
  17.       *back = *front;
  18.       *front = tmp;
  19.     } else {
  20.       --back;
  21.     }
  22.     if (*front <= cur) {
  23.       *(front - 1) = *front;
  24.       ++front;
  25.     }
  26.   }
  27.   *(front - 1) = cur;
  28.   sort(begin, front - 1);
  29.   sort(front, end);
  30. }
  31.  
  32. int main() {
  33.   int n;
  34.   scanf("%d", &n);
  35.   for (int i = 0; i < n; ++i) {
  36.     scanf("%d", &array[i]);
  37.   }
  38.   sort(array, array + n);
  39.   for (int i = 0; i < n; ++i) {
  40.     printf("%d ", array[i]);
  41.   }
  42.   printf("\n");
  43.   return 0;
  44. }
  45.  
stdin
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compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:34: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
prog.cpp:36: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result
stdout
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https://ideone.com/6vrS1
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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