제출 #805555

#제출 시각아이디문제언어결과실행 시간메모리
805555HaroldVemeno고대 책들 (IOI17_books)C++17
12 / 100
1 ms340 KiB
#include "books.h" #include <bits/stdc++.h> #ifdef GUDEB #define D(x) cerr << #x << ": " << (x) << '\n'; #define ifdeb if(true) #else #define D(x) ; #define ifdeb if(false) #endif #define all(x) begin(x), end(x) using namespace std; using ull = unsigned long long; using ll = long long; using pii = pair<int, int>; // #define int ll; struct N { int c; int i; friend bool operator < (const N& a, const N& b) { return a.c > b.c; } }; int n; ll ret = 0; priority_queue<N> q; set<int> unvis; int vis[1000000]; long long minimum_walk(vector<int> p, int s) { n = p.size(); for(int i = 0; i < n; ++i) { if(p[i] == i) { vis[i] = true; continue; } ret += abs(i - p[i]); unvis.insert(i); } unvis.insert(s); vis[s] = false; q.push({0, s}); while(!q.empty()) { N t = q.top(); q.pop(); D(t.i) D(t.c) if(vis[t.i]) continue; vis[t.i] = true; unvis.erase(t.i); ret += 2*t.c; D(ret) if(t.i != p[t.i]) { int mn = min(t.i, p[t.i]); int mx = max(t.i, p[t.i]); auto l = unvis.lower_bound(mn); while(l != unvis.end() && *l <= mx) { D(*l); q.push({0, *l}); l = unvis.erase(l); } } { int ln = t.i+1; if(ln < n && ln == p[ln]) ++ln; if(ln != n) { q.push({ln - t.i, ln}); } } { int rn = t.i-1; if(rn >= 0 && rn == p[rn]) --rn; if(rn >= 0) { q.push({t.i - rn, rn}); } } } return ret; }
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