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1 冒泡排序
void Bubble(int r[],int n) { int i,j,temp; for(i=0;i<n;i++) { for(j=0;j<n-i-1;j++) if(r[j]>r[j+1]) { temp=r[j]; r[j]=r[j+1]; r[j+1]=temp; } } }
改进算法
void Bubble(int r[],int n) { int i=n-1,pos; while(i>0) {
pos=0; for(j=0;j<n-i-1;j++) if(r[j]>r[j+1]) {
pos=j; temp=r[j]; r[j]=r[j+1]; r[j+1]=temp; }
i=pos; } }
改进算法避免了在排序中对上次已经得知顺序后,下次比较时还需要再比较的问题
2 快速比较
void print(int a[], int n){ for(int j= 0; j<n; j++){ cout<<a[j] <<" "; } cout<<endl; } void swap(int *a, int *b) { int tmp = *a; *a = *b; *b = tmp; } int partition(int a[], int low, int high) { int privotKey = a[low]; //基准元素 while(low < high){ //从表的两端交替地向中间扫描 while(low < high && a[high] >= privotKey) --high; //从high 所指位置向前搜索,至多到low+1 位置。将比基准元素小的交换到低端 swap(&a[low], &a[high]); while(low < high && a[low] <= privotKey ) ++low; swap(&a[low], &a[high]); } print(a,10); return low; } void quickSort(int a[], int low, int high){ if(low < high){ int privotLoc = partition(a, low, high); //将表一分为二 quickSort(a, low, privotLoc -1); //递归对低子表递归排序 quickSort(a, privotLoc + 1, high); //递归对高子表递归排序 } } int main(){ int a[10] = {3,1,5,7,2,4,9,6,10,8}; cout<<"初始值:"; print(a,10); quickSort(a,0,9); cout<<"结果:"; print(a,10); }
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原文地址:http://www.cnblogs.com/dongzhuangdian/p/5089916.html