c++如何巧妙变为c，青高收捷达

Question

#include<iostream>
#include<cstring>
#include<list>
#include<string>
using namespace std;
int main()
{
    list<char> list1 ;
    char str[50000] ;
    while(cin.getline(str,50000))
    {
        int n = strlen(str) ;
        for(int i=n-1;i>=0;i--)
        {
            char c = str[i] ;
            char c1 = str[i-1] ;
            if(c==' ')
                printf(" ") ;
            else
                list1.push_back(c) ;
            if(c!=' '&&c1==' ')
            {
                list<char>::iterator it=list1.begin();
                list1.reverse() ;
                for(it=list1.begin();it!=list1.end();it++)
                    printf("%c",*it) ;
                list1.clear() ;
            }
                    
        }
        list1.reverse() ;
        list<char>::iterator it=list1.begin();
        for(it=list1.begin();it!=list1.end();it++)
            printf("%c",*it) ;
        printf("\n") ;
        list1.clear() ;
    }
    return 0 ;
}

Answer 1

void reverse(char *s, int n)
{
    char *p = s + n - 1, c;   
    while (s <= p)
    {
        c = *s;
        *s++ = *p;
        *p-- = c;
    }
}

int main()
{
    char list[100];
    char str[50000];
    char ch;
    int n = 0, k = 0;
    while ((ch = getchar()) != '\n')
    {
        str[n++] = ch;
    }
    str[n] = '\0';

    for (int i = n - 1; i >= 0; i--)
    {
        char c = str[i];
        char c1 = str[i - 1];
        if (c == ' ')
            printf(" ");
        else
            list[k++] = c;
        if (c != ' ' && c1 == ' ')
        {
            list[k] = '\0';
            reverse(list, k);
            printf("%s", list);
            k = 0;
        }
    }
    list[k] = '\0';
    reverse(list, k);
    printf("%s", list);
    printf("\n");

    return 0;
}