Submission #1061514

#TimeUsernameProblemLanguageResultExecution timeMemory
1061514ZicrusAncient Books (IOI17_books)C++17
0 / 100
1 ms348 KiB
#include <bits/stdc++.h> #include "books.h" using namespace std; typedef long long ll; ll minimum_walk(vector<int> p, int s) { ll n = p.size(); ll res = 0; for (int i = 0; i < n; i++) res += abs(p[i] - i); if (res == 0) return 0; vector<bool> vst(n); vector<vector<ll>> cyc; vector<ll> mxCyc; vector<ll> cycId(n); for (int i = 0; i < n; i++) { if (vst[i] || p[i] == i) continue; cyc.push_back(vector<ll>()); mxCyc.push_back(i); ll cur = i; do { cyc.back().push_back(cur); mxCyc.back() = max(mxCyc.back(), cur); cycId[cur] = cyc.size()-1; cur = p[cur]; vst[cur] = true; } while (cur != i); } ll m = cyc.size(); vector<pair<ll, ll>> cycMM(m); for (int i = 0; i < m; i++) cycMM[i] = {cyc[i][0], mxCyc[i]}; for (int i = m-1; i >= 0; i--) { for (int j = i+1; j < m && cycMM[j].first < cycMM[i].second; j++) { if (cycMM[j].second > cycMM[i].second) { cycMM[i].first = cycMM[j].first = min(cycMM[i].first, cycMM[j].first); cycMM[i].second = cycMM[j].second = max(cycMM[i].second, cycMM[j].second); } } } ll left = s, right = s; ll mn = left, mx = right; if (p[mn] != mn) { mn = min(cycMM[cycId[mn]].first, mn); mx = max(cycMM[cycId[mn]].second, mx); } if (p[mx] != mx) { mn = min(cycMM[cycId[mx]].first, mn); mx = max(cycMM[cycId[mx]].second, mx); } left = mn; right = mx; while (left > 0 || right < n-1) { ll mn = max(0ll, left-1); ll mx = min(n-1, right+1); res += 2; if (p[mn] != mn) { mn = min(cycMM[cycId[mn]].first, mn); mx = max(cycMM[cycId[mn]].second, mx); } if (p[mx] != mx) { mn = min(cycMM[cycId[mx]].first, mn); mx = max(cycMM[cycId[mx]].second, mx); } left = mn; right = mx; } return res; }
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