제출 #119673

#제출 시각아이디문제언어결과실행 시간메모리
119673thebes고대 책들 (IOI17_books)C++14
50 / 100
295 ms46264 KiB
#include <bits/stdc++.h> using namespace std; const int MN = 1e6+6; typedef long long ll; ll n, i, arr[MN], id[MN], j, ans, nxt, l[MN], r[MN], L, R, ord[MN], sz; void dfs(ll n){ ans += abs(arr[n]-n); l[id[n]]=min(l[id[n]],n); r[id[n]]=max(r[id[n]],n); if(id[arr[n]]) return; id[arr[n]] = id[n]; dfs(arr[n]); } ll minimum_walk(vector<int> p, int s){ n = p.size(); if(s) return 0; // rip for(i=0;i<n;i++) arr[i+1]=p[i]+1; for(i=1;i<=n;i++) l[i]=n+1; for(i=1;i<=n;i++) if(!id[i]) id[i]=++nxt, dfs(i); for(i=1;i<=nxt;i++){ if(l[i]!=r[i]){ ord[++sz] = i; } } sort(ord+1,ord+sz+1,[](ll i,ll j){return l[i]<l[j];}); R = 1; for(i=1;i<=sz;i++){ ans += 2*max(0LL,l[ord[i]]-R); R = max(R, r[ord[i]]); } return ans; }
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