题目链接:hdu_5793_A Boring Question 题意: 自己看吧,说不清楚了. 题解: 打表找规律 #include<cstdio> typedef long long ll; ; ll pow(ll a,ll b) { ll an=; while(b){ )an=(an*a)%mod; b>>=,a=(a*a)%mod; } return an; } int main(){ int t,n,m; scanf("%d",&t); whil…

题意:由m个0到n组合的数的相邻两项的组合数的乘积. 思路:好好打表!!!找规律!!! #include<bits/stdc++.h> using namespace std; typedef long long ll; ; ; ; ll mypow(ll a, ll p, ll mo){ ll ret = ; while(p){ ) ret = ret * a % mod; a = a * a % mo; p >>= ; } return ret; } int main(){ l…

A Boring Question Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 156    Accepted Submission(s): 72 Problem Description       Input   The first line of the input contains the only integer T,(1≤T…

A Boring Question 题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5793 Description Input The first line of the input contains the only integer T, Then T lines follow,the i-th line contains two integers n,m. Output For each n and m,output the answer i…

A Boring Question Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 487    Accepted Submission(s): 271 Problem Description There are an equation.∑0≤k1,k2,⋯km≤n∏1⩽j<m(kj+1kj)%1000000007=? We define…

题解:http://bestcoder.hdu.edu.cn/blog/ 多校6 HDU5793 A Boring Question // #pragma comment(linker, "/STACK:102c000000,102c000000") // #include <conio.h> #include <bits/stdc++.h> using namespace std; #define clc(a,b) memset(a,b,sizeof(a))…

HDU 5793 - A Boring Question题意: 计算 ( ∑(0≤K1,K2...Km≤n )∏(1≤j<m) C[Kj, Kj+1]  ) % 1000000007=? (C[Kj, Kj+1] 为组合数)    分析: 利用二项式展开: (a + b) ^ n =  ∑(r = 0, n) (C[n, r] * a^(n-r) * b^r )        化简:           ∑(0≤K1,K2...Km≤n )∏(1≤j<m) C[Kj, Kj+1]       …

A Boring Question Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 865    Accepted Submission(s): 534 Problem Description There are an equation.∑0≤k1,k2,⋯km≤n∏1⩽j<m(kj+1kj)%1000000007=?We define…

题目链接: A Boring Question Time Limit: 2000/1000 MS (Java/Others)     Memory Limit: 65536/65536 K (Java/Others) Problem Description There are an equation.∑0≤k1,k2,⋯km≤n∏1⩽j<m(kj+1kj)%1000000007=?We define that (kj+1kj)=kj+1!kj!(kj+1−kj)! . And (kj+1kj)=…

There are an equation. ∑0≤k1,k2,⋯km≤n∏1⩽j<m(kj+1kj)%1000000007=? We define that (kj+1kj)=kj+1!kj!(kj+1−kj)! . And (kj+1kj)=0 while kj+1<kj. You have to get the answer for each n and m that given to you. For example,if n=1,m=3, When k1=0,k2=0,k3=0,(k…