题意:给定n个楼层,初始在a层,b层不可停留,每次选一个楼层x,当|x-now| < |x-b| 且 x != now 时可达(now表示当前位置),此时记录下x到序列中,走k步,最后问有多少种可能的数的序列. 解法: 定义:      dp[i][j] 表示第i步在j楼的不同序列的个数 转移方程: 当j<b时, 那么dp[i][j] += dp[i-1][0~(j与b的中点(以下))] 当j>b时, 那么dp[i][j] += dp[i-1][(j与b的中点(以下))~n] 由于dp[…

C. Riding in a Lift Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/480/problem/C Description Imagine that you are in a building that has exactly n floors. You can move between the floors in a lift. Let's number the floors f…

Imagine that you are in a building that has exactly n floors. You can move between the floors in a lift. Let's number the floors from bottom to top with integers from 1 to n. Now you're on the floor number a. You are very bored, so you want to take t…

Codeforces Round #267 (Div. 2) C. George and Job题目链接请点击~ The new ITone 6 has been released recently and George got really keen to buy it. Unfortunately, he didn't have enough money, so George was going to work as a programmer. Now he faced the follow…

Riding in a Lift time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output Imagine that you are in a building that has exactly n floors. You can move between the floors in a lift. Let's number the f…

A http://codeforces.com/contest/479/problem/A 枚举情况 #include<cstdio> #include<algorithm> using namespace std; int main(){ int a,b,c; while(~scanf("%d%d%d",&a,&b,&c)){ ; ans=max(ans,a+b+c); ans=max(ans,a*b*c); ans=max(ans,a…

B. Long Jumps Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/480/problem/B Description Valery is a PE teacher at a school in Berland. Soon the students are going to take a test in long jumps, and Valery has lost his favorit…

A. Exams Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/480/problem/A Description Student Valera is an undergraduate student at the University. His end of term exams are approaching and he is to pass exactly n exams. Valera…

题目链接:http://www.codeforces.com/problemset/problem/479/A题意:给你三个数a,b,c,使用+,*,()使得表达式的值最大.C++代码: #include <iostream> using namespace std; int a, b, c, ans; int main() { cin >> a >> b >> c; int t = max(a+b, a*b); ans = max(t + c, t * c…

http://codeforces.com/contest/479/problem/C C. Exams time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Student Valera is an undergraduate student at the University. His end of term exams are…