/** * Definition for singly-linked list. * struct ListNode { *     int val; *     struct ListNode *next; * }; */ struct ListNode* reverseList(struct ListNode* head) {    stru...

#include <iostream> using namespace std; string addBinary(string a, string b){ string res; int carry = 0;  // 进位 int i = a.size() - 1; int j = b.size() - 1; while(i >= 0 || j...

#include<iostream> using namespace std; int main(){ int num; cin >> num; while(num>9){ int total=0; while(num!=0){ total+=num%10; num/=10; } num = total; total = 0; } cout <&...

#include<stdio.h> int main(){ int n; scanf('%d',&n); int a[n][n]; int top=0,down=n-1,left=0,right=n-1,count=1; while(count<=n*n){ for (int i=left;i<=right;i++){ a[top]...