这里是代码
#include<bits/stdc++.h>
using namespace std;
#pragma GCC optimize("O2")
#define inf 0x7fffffff
#define pi acos(-1)
#define max(a,b) (a>b?a:b)
#define min(a,b) (a<b?a:b)
typedef long long ll;
int n;
int a[10005];
int ans;
int main()
{
ios::sync_with_stdio(false);
cin.tie(0);
cout.tie(0);
cin >> n;
for (int i = 1; i <= n; i++) cin >> a[i];
for (int i = 1; i <= n; i++)
for (int j = 1; j <= i; j++)
if (a[j] > a[j + 1])
{
swap(a[j], a[j + 1]);
ans++;
}
cout << ans << endl;
return 0;
}
望dalao指点!(QAQ)