题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=5417
Problem Description
Victor has a machine. When the machine starts up, it will pop out a ball immediately. After that, the machine will pop out a ball every w seconds. However, the machine has some flaws, every time after x seconds of process the machine has to turn off for y seconds for maintenance work. At the second the machine will be shut down, it may pop out a ball. And while it‘s off, the machine will pop out no ball before the machine restart.
Now, at the 0 second, the machine opens for the first time. Victor wants to know when the n-th ball will be popped out. Could you tell him?
Input
The input contains several test cases, at most 100 cases.
Each line has four integers x, y, w and n. Their meanings are shown above。
1≤x,y,w,n≤100.
Output
For each test case, you should output a line contains a number indicates the time when the n-th ball will be popped out.
Sample Input
2 3 3 3
98 76 54 32
10 9 8 100
Sample Output
10
2664
939
题意：
Victor有一个机器，这个机器每次开启的瞬间会弹出一个小球，之后每隔ww秒会弹出一个小球。因为机器不是很完善，该机器每开启xx秒就得关闭yy秒进行调整，在机器关闭的瞬间可能会有小球弹出，关闭之后一直到下一次开启之前都不会有小球弹出。 00时刻，机器第一次开启，Victor想要知道第nn个小球弹出的时刻，你能够告诉他吗？
大水题，模拟。
1 #include <iostream>
2 using namespace std;
3
4 int main()
5 {
6 int n,w,x,y;
7 while (cin>>x>>y>>w>>n)
8 {
9 int t=0,tt=0;//tt记录离刚开机多长时间
10 n--;
11 while (n>0)
12 {
13 tt+=w;
14 if (tt<x)
15 {
16 n--;
17 t+=w;
18 }
19 else if (tt==x)
20 {
21 n--;
22 t+=w;
23 if (n>0)
24 {
25 tt=0;
26 t+=y;
27 n--;
28 }
29 }
30 else
31 {
32 t+=w+x+y-tt;
33 tt=0;
34 n--;
35 }
36 }
37 cout <<t<<endl;
38 }
39 return 0;
40 }
41