PAT 甲级 1029 Median

https://pintia.cn/problem-sets/994805342720868352/problems/994805466364755968

Given an increasing sequence S of N integers, the median is the number at the middle position. For example, the median of S1 = { 11, 12, 13, 14 } is 12, and the median of S2 = { 9, 10, 15, 16, 17 } is 15. The median of two sequences is defined to be the median of the nondecreasing sequence which contains all the elements of both sequences. For example, the median of S1 and S2 is 13.

Given two increasing sequences of integers, you are asked to find their median.

Input Specification:

Each input file contains one test case. Each case occupies 2 lines, each gives the information of a sequence. For each sequence, the first positive integer N (

Output Specification:

For each test case you should output the median of the two given sequences in a line.

Sample Input:

4 11 12 13 14
5 9 10 15 16 17

Sample Output:

代码：

#include <bits/stdc++.h>
using namespace std;

const int maxn = 2e5 + 10;
int N, M;
int a[maxn];

int main() {
    scanf("%d", &N);
    for(int i = 1; i <= N; i ++)
        scanf("%d", &a[i]);
    a[N + 1] = INT_MAX;
    int cnt = 0;
    int temp;
    scanf("%d", &M);
    int mid = (N + M + 1) / 2;
    int i = 1;
    for(int j = 1; j <= M; j ++) {
        scanf("%d", &temp);
        while(a[i] < temp) {
            cnt ++;
            if(cnt == mid) printf("%d", a[i]);
            i ++;
        }
        cnt ++;
        if(cnt == mid) printf("%d", temp);
    }
    while(i < N) {
        cnt ++;
        if(cnt == mid) printf("%d", a[i]);
        i ++;
    }
    return 0;
}

　　不能把两个数组合并起来再排序求中位数会内存超限先输入第一个数组之后算出中位数是第几个然后输入第二个数组如果输入当前比第一个数组的起始的大那么 cnt ++ 然后第一个数组向后挪一位如果一直没有比第一个数组大的那么在第二个数组里继续计数如果还不到 mid 那么回第一个数组中继续