『算法-ACM 竞赛-思维题』-CodeForces - 220C Little Elephant and Shifts （STL 模拟）

ACM 思维题训练集合
The Little Elephant has two permutations a and b of length n, consisting of numbers from 1 to n, inclusive. Let’s denote the i-th (1 ≤ i ≤ n) element of the permutation a as ai, the j-th (1 ≤ j ≤ n) element of the permutation b — as bj.

The distance between permutations a and b is the minimum absolute value of the difference between the positions of the occurrences of some number in a and in b. More formally, it’s such minimum |i - j|, that ai = bj.

A cyclic shift number i (1 ≤ i ≤ n) of permutation b consisting from n elements is a permutation bibi + 1… bnb1b2… bi - 1. Overall a permutation has n cyclic shifts.

The Little Elephant wonders, for all cyclic shifts of permutation b, what is the distance between the cyclic shift and permutation a?

Input
The first line contains a single integer n (1 ≤ n ≤ 105) — the size of the permutations. The second line contains permutation a as n distinct numbers from 1 to n, inclusive. The numbers are separated with single spaces. The third line contains permutation b in the same format.

Output
In n lines print n integers — the answers for cyclic shifts. Print the answers to the shifts in the order of the shifts’ numeration in permutation b, that is, first for the 1-st cyclic shift, then for the 2-nd, and so on.

Examples
Input
2
1 2
2 1
Output
1
0
Input
4
2 1 3 4
3 4 2 1
Output
2
1
0
1
这个题预处理一下初始的 dis，然后用 mutiset 模拟即可

#include <bits/stdc++.h>
using namespace std;
const int maxn = 100005;
int a[maxn],b[maxn];
multiset<int> ms;
int main()
{
    int n, x;
    scanf("%d", &n);
    for (int i = 0; i < n; ++i)
    {
        scanf("%d", &x);
        a[x] = i;
    }
    for (int i = 0; i < n; ++i)
    {
        scanf("%d", &b[i]);
        ms.insert(i - a[b[i]]);
    }
    for (int i = 0; i < n; ++i)
    {
        auto po = ms.lower_bound(i);
        int ans = 0X3F3F3F3F;
        if (po != ms.end())
            ans = min(ans, *po - i);
        else if (po != ms.begin())
            ans = min(ans, i - *(--po));
        printf("%d\n", ans);
        po = ms.find(i - a[b[i]]);
        ms.erase(po);
        ms.insert(i - a[b[i]] + n);
    }
}