字符串面试题（二）— 间隔字符串逆序

#include<iostream>
#include<string>
#include<vector>
using namespace std;
class Reverse {
public:
    string reverseSentence(string A, int n) 
    {
        reverseWord(A,0,n-1);
        int i=0,j=0;
        while(i<n)
        {
            while(i<n&&A[i]==' ')
                i++;
            if(i>=n)
                return A;
            j=i;
            while(i<n&&A[i]!=' ')
                i++;
            if(i>=n)
            {
                reverseWord(A,j,n-1);
                return A;
            }
            reverseWord(A,j,i-1);
        }
        return A;

    }
    void reverseWord(string &A,int low,int high)
    //局部逆序函数
    {
        if(low>=high)
            return;
        char temp;
        while(low<high)
        {
            temp=A[low];
            A[low]=A[high];
            A[high]=temp;
            low++;
            high--;
        }
    }
};
int main()
{
    string arr("dog loves pig");
    Reverse a;
    a.reverseSentence(arr,13);
    cout<<arr;
    return 0;
}