제출 #69358

#제출 시각아이디문제언어결과실행 시간메모리
69358BruteforcemanAncient Books (IOI17_books)C++11
0 / 100
12 ms9316 KiB
#include "books.h" #include "bits/stdc++.h" using namespace std; int col[1000010]; bool vis[1000010]; bool v[1000010]; int l[1000010], r[1000010]; int cmp[1000010]; void dfs(int x, int c) { v[x] = true; for(int i = l[x]; i <= r[x]; i++) { cmp[i] = c; if(col[i] != -1 && v[col[i]] == false) { dfs(col[i], c); } } } long long minimum_walk(std::vector<int> p, int s) { long long ans = 0; int n = p.size(); for(int i = 0; i < n-1; i++) { int go_left = 0; int go_right = 0; for(int j = 0; j <= i; j++) { if(p[j] > i) { ++go_left; } } for(int j = i + 1; j < n; j++) { if(p[j] < i+1) { ++go_right; } } assert(go_left == go_right); ans += go_left + go_right; } memset(col, -1, sizeof col); memset(v, false, sizeof v); int id = 0; for(int i = 0; i < n; i++) { if(col[i] != -1 || p[i] == i) continue; int cur = i; ++id; l[id] = n; r[id] = 0; while(col[cur] == -1) { l[id] = min(l[id], cur); r[id] = max(r[id], cur); col[cur] = id; cur = p[cur]; } } memset(cmp, -1, sizeof cmp); int c = 0; for(int i = 1; i <= id; i++) { if(v[i] == false) { dfs(i, ++c); } } for(int i = 0; i < n; i++) { col[i] = cmp[i]; } int p1 = 0; int p2 = 0; while(col[p1] == -1 && p1 < s) { ++p1; } while(col[p2] == -1 && p2 > s) { --p2; } for(int i = p1; i < p2; i++) { if(col[i] == -1 || col[i + 1] == -1) { ans += 2; } } return ans; }
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