【40.17%】【codeforces 569B】Inventory

time limit per test1 second
memory limit per test256 megabytes
inputstandard input
outputstandard output
Companies always have a lot of equipment, furniture and other things. All of them should be tracked. To do this, there is an inventory number assigned with each item. It is much easier to create a database by using those numbers and keep the track of everything.

During an audit, you were surprised to find out that the items are not numbered sequentially, and some items even share the same inventory number! There is an urgent need to fix it. You have chosen to make the numbers of the items sequential, starting with 1. Changing a number is quite a time-consuming process, and you would like to make maximum use of the current numbering.

You have been given information on current inventory numbers for n items in the company. Renumber items so that their inventory numbers form a permutation of numbers from 1 to n by changing the number of as few items as possible. Let us remind you that a set of n numbers forms a permutation if all the numbers are in the range from 1 to n, and no two numbers are equal.

Input
The first line contains a single integer n — the number of items (1 ≤ n ≤ 105).

The second line contains n numbers a1, a2, …, an (1 ≤ ai ≤ 105) — the initial inventory numbers of the items.

Output
Print n numbers — the final inventory numbers of the items in the order they occur in the input. If there are multiple possible answers, you may print any of them.

Examples
input
3
1 3 2
output
1 3 2
input
4
2 2 3 3
output
2 1 3 4
input
1
2
output
1
Note
In the first test the numeration is already a permutation, so there is no need to change anything.

In the second test there are two pairs of equal numbers, in each pair you need to replace one number.

In the third test you need to replace 2 by 1, as the numbering should start from one.

【题目链接】:http://codeforces.com/contest/569/problem/B

【题解】

for 扫一遍,把没出现的数字记录下来;
for 扫一遍,把每个数字出现的次数记录下来;
for 扫一遍,如果该数字出现次数大于1,则随便把它改成一个没出现的数字;
或者该数字大于n也要改成一个没出现的数字;

【完整代码】

#include <bits/stdc++.h>
using namespace std;
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define LL long long
#define rep1(i,a,b) for (int i = a;i <= b;i++)
#define rep2(i,a,b) for (int i = a;i >= b;i--)
#define mp make_pair
#define pb push_back
#define fi first
#define se second
#define rei(x) scanf("%d",&x)
#define rel(x) scanf("%I64d",&x)

typedef pair<int,int> pii;
typedef pair<LL,LL> pll;

const int MAXN = 1e5+10;
const int dx[9] = {0,1,-1,0,0,-1,-1,1,1};
const int dy[9] = {0,0,0,-1,1,-1,1,-1,1};
const double pi = acos(-1.0);

int n;
int a[MAXN];
map <int,int> dic;
vector <int> g;

int main()
{
    //freopen("F:\rush.txt","r",stdin);
    rei(n);
    rep1(i,1,n)
    {
        rei(a[i]);
        dic[a[i]]++;
    }
    rep1(i,1,n)
        if (dic[i]==0)
            g.pb(i);
    int len = g.size();
    len--;
    rep1(i,1,n)
    {
        int temp = dic[a[i]];
        if (a[i]>n)
        {
            a[i] = g[len];
            len--;
        }
        else
            if (temp>1)
            {
                dic[a[i]]--;
                a[i] = g[len];
                len--;
            }
    }
    rep1(i,1,n)
        {
            printf("%d",a[i]);
            if (i==n) puts("");
            else
                printf(" ");
        }
    return 0;
}