D. Time to go back   time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output You have been out of Syria for a long time, and you recently decided to come back. You remember that you have M friends…

  A. Who is the winner?   time limit per test 1 second memory limit per test 64 megabytes input standard input output standard output A big marathon is held on Al-Maza Road, Damascus. Runners came from all over the world to run all the way along the…

  B. New Job   time limit per test 1 second memory limit per test 64 megabytes input standard input output standard output This is the first day for you at your new job and your boss asks you to copy some files from one computer to other computers in…

  C. Palindrome Again !!   time limit per test 1 second memory limit per test 64 megabytes input standard input output standard output Given string with N characters, your task is to transform it to a palindrome string. It's not as easy as you may th…

D. Time to go back time limit per test:1 second memory limit per test:256 megabytes input:standard input output:standard output You have been out of Syria for a long time, and you recently decided to come back. You remember that you have M friends th…

一,使用计算机计算组合数 1,设计思想 (1)使用组合数公式利用n!来计算Cn^k=n!/k!(n-k)!用递推计算阶乘 (2)使用递推的方法用杨辉三角计算Cn+1^k=Cn^k-1+Cn^k 通过数组写出杨辉三角,对应的几排几列就对应这组合数的n和k (3)使用递归的方法用组合数递推公式计算 定义带参数的方法,将不同的参数传递给方法,然后计算出阶乘 2,程序流程图 3,程序源代码 package 计算组合数; import java.util.Scanner; public class Cac…

哈哈哈哈哈哈哈,最近一直在补题,改各种错误的代码,wa了20多遍,改到心态爆炸,改好之后,感觉世界都美好了(叉会腰~)... A. Who is the winner? time limit per test 1 second memory limit per test 64 megabytes input standard input output standard output A big marathon is held on Al-Maza Road, Damascus. Runners…

思路: next_permutation()加个递推组合数随便搞搞就A了- //By SiriusRen #include <cstdio> #include <algorithm> using namespace std; int n,C[11][11],sum,f[11]; int main(){ scanf("%d%d",&n,&sum); for(int i=1;i<=n;i++)C[i][i]=1,f[i]=i; for(int…

Given an index k, return the kth row of the Pascal's triangle. For example, given k = 3,Return [1,3,3,1]. Note:Could you optimize your algorithm to use only O(k) extra space? 杨辉三角想必大家并不陌生,应该最早出现在初高中的数学中,其实就是二项式系数的一种写法. 1 1 1 1 2 1 1 3 3 1 1 4 6 4 1 1…

Given numRows, generate the first numRows of Pascal's triangle. For example, given numRows = 5,Return [ [1], [1,1], [1,2,1], [1,3,3,1], [1,4,6,4,1] ] 杨辉三角是二项式系数的一种写法,如果熟悉杨辉三角的五个性质,那么很好生成,可参见我的上一篇博文: http://www.cnblogs.com/grandyang/p/4031536.html 具体生…