#include<bits/stdc++.h>
#define ll long long int
#define pb push_back
#define vi vector<int>
using namespace std;
ll minimum_walk(vector<int> p,int s){
ll res=0;
int n=p.size();
vi cant(n+2,0);
for(int i=0;i<n;i++){
if(p[i]==i)continue;
res+=abs(i-p[i]);
int mi=min(i,p[i]);
int ma=max(i,p[i]);
cant[mi]++;
cant[ma+1]--;
}
int sum=0;
int acum=0;
for(int i=0;i<n;i++){
acum+=cant[i];
if(acum==0){
sum++;
}else{
res+=2*sum;
sum=0;
}
}
return res;
}
int main(){
int n,x;
cin>>n;
vi v;
for(int i=0;i<n;i++){
cin>>x;
v.pb(x);
}
cout<<minimum_walk(v,0)<<endl;
return 0;
}
Compilation message
/usr/bin/ld: /tmp/ccCJQZNx.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccpAhPOy.o:books.cpp:(.text.startup+0x0): first defined here
collect2: error: ld returned 1 exit status
