제출 #228073

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
228073		VEGAnn	Ancient Books (IOI17_books)	C++14	42 / 100	2097 ms	12968 KiB

books

#include <bits/stdc++.h>
#include "books.h"
#define sz(x) ((int)x.size())
#define all(x) x.begin(),x.end()
#define PB push_back
using namespace std;
typedef long long ll;
const int N = 1010;
const ll OO = 1e18;
queue<int> q;
vector<ll> f[N];
ll ans = 0, mn = ll(1e9);
int n, lf, rt, le[N], ri[N];

long long minimum_walk(std::vector<int> p, int s) {
    n = sz(p);

    bool was = 0;

    for (int i = 0; i < n; i++){
        ans += abs(p[i] - i);

        if (p[i] != i) {
            was = 1;
            lf = min(lf, i);
            rt = max(rt, i);
        }
    }

    if (!was) return 0;

    for (int i = 0; i < n; i++){
        le[i] = ri[i] = i;
        q.push(i);

        while (sz(q)){
            int v = q.front(); q.pop();

            int nl = v, nr = p[v];

            if (nl > nr) swap(nl, nr);

            if (nl < le[i]){
                for (int j = nl; j < le[i]; j++)
                    q.push(j);
                le[i] = nl;
            }

            if (nr > ri[i]){
                for (int j = ri[i] + 1; j <= nr; j++)
                    q.push(j);
                ri[i] = nr;
            }
        }
    }

    for (int i = lf; i <= s; i++){
        f[i].resize(n);
        fill(all(f[i]), OO);
    }

    f[le[s]][ri[s]] = 0;

    int len = rt - lf + 1;

    for (int k = 1; k < len; k++)
    for (int l = lf; l <= s && l + k - 1 <= rt; l++){
        int r = l + k - 1;

        if (f[l][r] == OO) continue;

        if (l > lf){
            int nl = min(l - 1, le[l - 1]);
            int nr = max(r, ri[l - 1]);

            f[nl][nr] = min(f[nl][nr], f[l][r] + 2);
        }

        if (r < rt){
            int nl = min(l, le[r + 1]);
            int nr = max(r + 1, ri[r + 1]);

            f[nl][nr] = min(f[nl][nr], f[l][r] + 2);
        }
    }

	return ans + f[lf][rt];
}

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