Minimize The Integer

Minimize The Integer

题意:
有一个序列,如果相邻的两个数的奇偶性不同,就可以把它们交换。问得到的最小的序列是什么。
思路:
根据题意我们可以理解为相同奇偶性的数字顺序是不能变的,能变得只是不同奇偶性的数字。
所以我们可以通过两个队列来分别按顺序存储奇数和偶数,然后判断大小依次输出就行。
AC代码:

#include <iostream>
#include <algorithm>

using namespace std;
const int N = 1e6 + 10;
typedef long long ll;
char s1[N],s2[N];

int main()
{
    int t;cin>>t;
    while(t --)
    {
        string s;cin>>s;
        int len = s.size();
        int pos1 = 0;
        int pos2 = 0;
        for(int i = 0 ; i < len ; i ++)
        {
            if((s[i] -'0') %2)
                s1[pos1++] = s[i];
            else
                s2[pos2++] = s[i];
        }
        int i = 0,j = 0;
        while(i < pos1 || j < pos2)
        {
            if(i >= pos1)
                cout<<s2[j++];
            else if(j >= pos2)
                cout<<s1[i++];
            else if(s1[i] <= s2[j])
                cout<<s1[i++];
            else
                cout<<s2[j++];
        }
        cout<<endl;
    }
    return 0;
}

B. Serval and Final MEX time limit per test1 second memory limit per test256 megabytes You are given an array a consisting of n≥4 non-negative integers. You need to perform the following operation on a until its length becomes 1 : Select two indices l and r (1≤l<r≤|a| ), and replace the subarray [al,al+1,…,ar] with a single integer mex([al,al+1,…,ar]) , where mex(b) denotes the minimum excluded (MEX)∗ of the integers in b . In other words, let x=mex([al,al+1,…,ar]) , the array a will become [a1,a2,…,al−1,x,ar+1,ar+2,…,a|a|] . Note that the length of a decreases by (r−l) after this operation. Serval wants the final element in a to be 0 . Help him! More formally, you have to find a sequence of operations, such that after performing these operations in order, the length of a becomes 1 , and the final element in a is 0 . It can be shown that at least one valid operation sequence exists under the constraints of the problem, and the length of any valid operation sequence does not exceed n . Note that you do not need to minimize the number of operations. ∗ The minimum excluded (MEX) of a collection of integers b1,b2,…,bk is defined as the smallest non-negative integer x which does not occur in the collection b . Input Each test contains multiple test cases. The first line contains the number of test cases t (1≤t≤1000 ). The description of the test cases follows. The first line of each test case contains a single integer n (4≤n≤5000 ) — the length of the array a . The second line contains n integers a1,a2,…,an (0≤ai≤n ) — the elements of the array a . It is guaranteed that the sum of n over all test cases does not exceed 5000 . Output For each test case, output a single integer k (0≤k≤n ) in the first line of output — the length of the operation sequence. Then, output k lines, the i -th line containing two integers li and ri (1≤li<ri≤|a| ) — the two indices you choose in the i -th operation, where |a| denotes the length of the array be
最新发布
03-23
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