比赛 2026.8.26 评测结果 AAAAAAAAAAAAAAAAAAAAATTTT
题目名称 sort 最终得分 84
用户昵称 李金泽 运行时间 1.591 s
代码语言 C++ 内存使用 9.75 MiB
提交时间 2026-08-26 12:49:23
显示代码纯文本
#include<bits/stdc++.h>
#define N 2000005
#define int long long
#define db double
#define fo(i,l,r) for(int i=l;i<=r;i++)
#define rf(i,r,l) for(int i=r;i>=l;i--)
using namespace std;
int T,n,m,k,a[N],t[N],h[N],op,x,y,z,ans,last;
void swap(int &x,int &y){int t=x;x=y;y=t;}
int max(int x,int y){return x>y?x:y;}
int min(int x,int y){return x<y?x:y;}
void ckmax(int &x,int y){if(y>x)x=y;}
void ckmin(int &x,int y){if(y<x)x=y;}
int fp(int a,int n,int mod){
    int ans=1;
    while(n){
        if(n&1)ans=ans*a%mod;
        a=a*a%mod;
        n>>=1;
    }
    return ans;
}
int gcd(int a,int b){return b?gcd(b,a%b):a;}
int po(int x){return x*x;}
int sub(int x,int y){return x>y?x-y:y-x;}
int ab(int x){return x<0?-x:x;}
int read(){
    int sum=0;bool f=0;char c=getchar();
    for(;c<48||c>57;c=getchar())if(c==45)f=1;
    for(;c>=48&&c<=57;c=getchar())sum=sum*10+(c&15);
    return f?-sum:sum;
}
void ud1(int x){while(x)t[x]++,x&=x-1;}
int gs1(int x){int sum=0;while(x<=n)sum+=t[x],x+=x&-x;return sum;}
void ud2(int x){while(x<=n)t[x]--,x+=x&-x;}
int gs2(int x){int sum=0;while(x)sum+=t[x],x&=x-1;return sum;}
signed main(){
    freopen("sorttros.in","r",stdin);freopen("sorttros.out","w",stdout);
    n=read();fo(i,1,n)h[a[i]=read()]=i;
    rf(i,n,1){
        x=a[i]<n?gs1(a[i]+1):0;
        ans+=x?1:n-a[i];
        ud1(a[i]);
    }
    fo(i,1,n)t[i]=i&-i;
    bool f=0;
    rf(i,n,1){
        ud2(h[i]);
        if(gs2(h[i])>=2)f=1;
    }
    if(f)ans++;
    printf("%lld",ans);
    return 0;
}