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#include<iostream>
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#define ElemType int
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using namespace std;
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void print(int a[], int n) {
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for (int j = 0; j < n; j++) {
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cout << a[j] << " ";
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}
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cout << endl;
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}
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//<2F><>r[i<><69>m]<5D><>r[m +1 <20><>n]<5D>鲢<EFBFBD><E9B2A2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>rf[i<><69>n]
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void Merge(ElemType *r, ElemType *rf, int i, int m, int n)
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{
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int j, k;
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for (j = m + 1, k = i; i <= m && j <= n; ++k) {
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if (r[j] < r[i]) rf[k] = r[j++];
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else rf[k] = r[i++];
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}
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while (i <= m) rf[k++] = r[i++];
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while (j <= n) rf[k++] = r[j++];
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print(rf, n + 1);
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}
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void MergeSort(ElemType *r, ElemType *rf, int lenght)
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{
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int len = 1;
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ElemType *q = r;
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ElemType *tmp;
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while (len < lenght) {
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int s = len;
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len = 2 * s;
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int i = 0;
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while (i + len < lenght) {
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Merge(q, rf, i, i + s - 1, i + len - 1); //<2F>Եȳ<D4B5><C8B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӱ<EFBFBD><D3B1>ϲ<EFBFBD>
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i = i + len;
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}
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if (i + s < lenght) {
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Merge(q, rf, i, i + s - 1, lenght - 1); //<2F>Բ<EFBFBD><D4B2>ȳ<EFBFBD><C8B3><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ӱ<EFBFBD><D3B1>ϲ<EFBFBD>
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}
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tmp = q; q = rf; rf = tmp; //<2F><><EFBFBD><EFBFBD>q,rf<72><66><EFBFBD>Ա<EFBFBD>֤<EFBFBD><D6A4>һ<EFBFBD>˹鲢ʱ<E9B2A2><CAB1><EFBFBD>Դ<EFBFBD>q <20>鲢<EFBFBD><E9B2A2>rf
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}
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}
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int main() {
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int a[10] = { 3,1,5,7,2,4,9,6,10,8 };
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int b[10];
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MergeSort(a, b, 10);
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print(b, 10);
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cout << "<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>";
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print(a, 10);
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}
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时间复杂度 O(N*logN)
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归并排序的空间复杂度是O(n)
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