题目 Source http://acm.hdu.edu.cn/showproblem.php?pid=5937 Description Little Ruins is a studious boy, recently he learned addition operation! He was rewarded some number bricks of 1 to 9 and infinity bricks of addition mark '+' and equal mark '='. Now…

题解其实网上有 突然有点感想 为什么可以用搜索或状压,因为方案数很有限,它要求每种方案不同就意味着搜索的次数也一定,所以现在就应该坚定往这方面想,找部分方案的贪心.这和上一题一样,都是先暴力,后面处理. #include<bits/stdc++.h> using namespace std; #define sz(X) ((int)X.size()) #define lson l,m,rt<<1 #define rson m+1,r,rt<<1|1 typedef lo…

题意与分析 时隔一个月之后来补题.说写掉的肯定会写掉. 题意是这样的:给1~9这些数字,每个数字有\(X_i\)个,问总共能凑成多少个不同的等式\(A+B=C\)(\(A,B,C\)均为1位,\(1+2=3\)和\(2+1=3\)视为不同等式)? 这题的搜索稍微有一些技巧:先暴力再搜索,而不是起手就搜索.怎么个暴力呢?把所有能够构成\(A+B=C\)的情况先全部穷举出来,然后看先有的这些bricks的数目能不能够实现这些情况--这就是基础搜索了.两种情况:a)当前情形能够用,答案+1:b)当前情…

B. Little Dima and Equation time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Dima misbehaved during a math lesson a lot and the nasty teacher Mr. Pickles gave him the following proble…

 FZU 2102   Solve equation Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u  Practice Description You are given two positive integers A and B in Base C. For the equation: A=k*B+d We know there always existing many non-nega…

题意: 有1~9数字各有a1, a2, -, a9个, 有无穷多的+和=. 问只用这些数字, 最多能组成多少个不同的等式x+y=z, 其中x,y,z∈[1,9]. 等式中只要有一个数字不一样 就是不一样的 思路: 计算下可以发现, 等式最多只有36个. 然后每个数字i的上界是17-i个 可以预先判掉答案一定是36的, 然后直接暴力搜索每个等式要不要就好了. 注意剪枝即可 ; int a[maxn]; bool flag36; int ans; struct Equation { int x, y…

#对coursera上Andrew Ng老师开的机器学习课程的笔记和心得: #注:此笔记是我自己认为本节课里比较重要.难理解或容易忘记的内容并做了些补充,并非是课堂详细笔记和要点: #标记为<补充>的是我自己加的内容而非课堂内容,参考文献列于文末.博主能力有限,若有错误,恳请指正: #---------------------------------------------------------------------------------# 多元线性回归的模型: #-----------…

Codeforces Round #262 (Div. 2) B B - Little Dima and Equation B. Little Dima and Equation time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Little Dima misbehaved during a math lesson a lot a…

,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, ,, 1 % Exercise 1: Linear regression with multiple variables %% Initialization %% ================ Part 1: Featu…

Can you solve this equation? Time Limit: / MS (Java/Others) Memory Limit: / K (Java/Others) Total Submission(s): Accepted Submission(s): Problem Description Now,given the equation *x^ + *x^ + *x^ + *x + == Y,can you find its solution between and ; No…