题解 | #复制部分字符串#

#include <iostream>
using namespace std;

int main() {

    char str[30] = { 0 };
    cin.getline(str, sizeof(str));

    int m;
    cin >> m;

    // write your code here......
    char copy[30] = { 0 };
    char *p = str + m - 1;
    char *q = copy;
    while (*p != '\0')
    {
        *q = *p;
        p++;
        q++;
    }
    cout << copy;

    return 0;
}

定义双指针同时移动赋值是最高效的