Codeforces Round #426 (Div. 2)A. The Useless Toy
题意：4个箭头，给出起始箭头，终始箭头，问经历n次，是由顺时针cw得到，还是逆时针cww得到，如果都可以输出undefined
思路：n%4,就是次数了，再两个方向模拟下
1 #include<bits/stdc++.h> 2 using namespace std; 3 typedef long long ll; 4 const int N=1e5+10; 5 6 int a[6]={0,1,2,3,4}; 7 int main(){ 8 int n; 9 char s1[2],s2[2]; 10 scanf("%s%s",s1,s2); 11 scanf("%d",&n); 12 int l,r; 13 if(s1[0]=='^') l=1; 14 else if(s1[0]=='>') l=2; 15 else if(s1[0]=='v') l=3; 16 else if(s1[0]=='<') l=4; 17 if(s2[0]=='^') r=1; 18 else if(s2[0]=='>') r=2; 19 else if(s2[0]=='v') r=3; 20 else if(s2[0]=='<') r=4; 21 int s=0; 22 n=n%4; 23 int ll=l,rr=l; 24 int ss1=0; 25 int ss2=0; 26 if(((ll+n)%4)==r%4){ 27 ss1=1; 28 } 29 if(((l-n+4)%4)==r%4) 30 ss2=1; 31 if(ss1&&ss2){ 32 cout<<"undefined"<<endl; 33 } 34 else if(ss1){ 35 cout<<"cw"<<endl; 36 } 37 else 38 cout<<"ccw"<<endl; 39 }
