Submission #431788

#	Time	Username	Problem	Language	Result	Execution time	Memory
431788		yuto1115	Ancient Books (IOI17_books)	C++17	0 / 100	2099 ms	469364 KiB

books

#include "books.h"
#include "bits/stdc++.h"
#define rep(i, n) for(ll i = 0; i < ll(n); i++)
#define rep2(i, s, n) for(ll i = ll(s); i < ll(n); i++)
#define rrep(i, n) for(ll i = ll(n)-1; i >= 0; i--)
#define pb push_back
#define eb emplace_back
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
using namespace std;
using ll = long long;
using P = pair<int, int>;
using vi = vector<int>;
using vvi = vector<vi>;
using vl = vector<ll>;
using vvl = vector<vl>;
using vp = vector<P>;
using vvp = vector<vp>;
using vb = vector<bool>;
using vvb = vector<vb>;
using vs = vector<string>;
const int inf = 1001001001;
const ll linf = 1001001001001001001;

template<class T>
bool chmin(T &a, T b) {
    if (a > b) {
        a = b;
        return true;
    }
    return false;
}

template<class T>
bool chmax(T &a, T b) {
    if (a < b) {
        a = b;
        return true;
    }
    return false;
}

ll minimum_walk(vi p, int s) {
    int n = p.size();
    map<vi, int> mp;
    vvi rev;
    vi ord(n);
    iota(all(ord), 0);
    int t = 0;
    do {
        mp[ord] = t++;
        rev.pb(ord);
    } while (next_permutation(all(ord)));
    vvi dp(24, vi(n, inf));
    priority_queue<pair<int, P>, vector<pair<int, P>>, greater<pair<int, P>>> q;
    dp[mp[p]][0] = 0;
    q.emplace(0, P(mp[p], 0));
    while (!q.empty()) {
        auto[d, p] = q.top();
        q.pop();
        auto[bd, pos] = p;
        if (dp[bd][pos] < d) continue;
        rep(i, 4) {
            if (chmin(dp[bd][i], d + abs < int > (i - pos))) {
                q.emplace(dp[bd][i], P(bd, i));
            }
        }
        iota(all(ord), 0);
        do {
            if (ord[0] != pos) continue;
            rep2(len, 2, n) {
                vi v(ord.begin(), ord.begin() + len);
                int nd = d;
                vi nb = rev[bd];
                rep(i, len) {
                    nd += abs(v[i] - v[(i + 1) % len]);
                    nb[v[i]] = rev[bd][v[(i + 1) % len]];
                }
                if (chmin(dp[mp[nb]][pos], nd)) {
                    q.emplace(dp[mp[nb]][pos], P(mp[nb], pos));
                }
            }
        } while (next_permutation(all(ord)));
    }
    return dp[0][0];
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 10
• Subtask 3: 0 / 28
• Subtask 4: 0 / 20
• Subtask 5: 0 / 30