408数据结构强化（自用）

常用代码片段（持续更新）

折半查找

void SearchBinary(int A[];int x){
    int low = 0, high = n-1, mid;
    while(low<=high){
        mid = (low+high)/2;
        if(A[mid]==x) break;
        else if(A[mid] < x) low = mid + 1;
        else high = mid - 1;
    }

顺序表逆置

void Reverse(SqList &L){
    for(int i=0;i

快速排序

int huafen(int A[]; int L; int R)
    int mid = A[L];
    while(L=mid) R--;
        A[L] = A[R];
        while(L<=R&&A[L]<=mid) L++:
        A[R] = A[L];
      }
    A[L] = mid;
    retutn L;
   }
void Qsort(int A[], int L, int R){
    if(L>=R) return;
    int M = huafen(A, L, R);
    Qsort(A, M+1, R); //右半部分快排
    Qsort(A, L, M-1); //左半部分快排
}

快速排序的划分思想

//使用划分函数找到数组中第k小的元素
int huafen(int A[]; int L; int R)
    int mid = A[L];
    while(L=mid) R--;
        A[L] = A[R];
        while(L<=R&&A[L]<=mid) L++:
        A[R] = A[L];
      }
    A[L] = mid;
    retutn L;
   }
int func(int A[], int n, int k){
    int L = 0, R = n-1, M = 0;
    while(1){
        M = huafen(A ,R ,L);
        if(M == k-1) break;
        else if(M > k-1) R = M-1;
        else if(M < k-1) L = m+1;
    }
    return A[k-1];
}