[USACO 2021.02 Feb]Problem 3. Clockwise Fence

1. #include <iostream>
2. #include <cstdio>
3. #include <string>
4. using namespace std;
5. int n;
6. string s;
7. 
8. int angle(char a,char b){
9.  if(a==b)return 0;
10.   else if(a=='E'&&b=='N') return 90;
11.   else if(a=='N'&&b=='W') return 90;
12.   else if(a=='W'&&b=='S') return 90;
13.   else if(a=='S'&&b=='E') return 90;
14.   else if(a=='E'&&b=='S') return -90;
15.   else if(a=='S'&&b=='W') return -90;
16.   else if(a=='W'&&b=='N') return -90;
17.   else if(a=='N'&&b=='E') return -90;
18. }
19. 
20. void clockwinse(string ts,int ls){
21.   int tj=0;
22.   for(int i=0;i<ls-1;i++)
23.     tj+=angle(ts[i],ts[i+1]);
24.   tj+=angle(ts[ls-1],ts[0]);
25.   if(tj<0) cout<<"CW"<<endl;
26.   else cout<<"CCW"<<endl;
27. }
28. 
29. int main()
30. {
31.   cin>>n;
32.   for(int i=1;i<=n;i++){
33.     cin>>s;
34.     clockwinse(s,s.size());
35.   }
36. return 0;
37. }