#include <stdio.h>
 
int cmp(int x, int y)
{
    return x > y;
}
 
void swap(int *x, int *y)
{
    int tmp = *x;
    *x = *y;
    *y = tmp;
}
 
int main(void)
{
    int a[] = {3, 1, 4, 1, 5, 9, 2, 6, 5};
    size_t n = sizeof a / sizeof a[0];
    int count = 0; // swap呼び出し回数カウンタ
 
    for (size_t i = 0; i < n - 1; ++i) {
        for (size_t j = 0; j < n - 1 - i; ++j) {
            if (cmp(a[j], a[j + 1])) {
                swap(&a[j], &a[j + 1]);
                count++;
            }
        }
    }
 
    for (size_t i = 0; i < n; ++i) {
        printf("%d ", a[i]);
    }
    printf("\nswap回数: %d\n", count); // 10 と出力される
 
    return 0;
}
 

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