Codeforces Round #426 A

Posted 2020-09-30 %%%%%

The Useless Toy

题意：如下图字符的变换

现在给你初始的字符和旋转n次的字符，问你，它是顺时针还是逆时针或者是其他

思路：4为循环节，先保存好顺时针和逆时针的字符顺序，然后判断初始的时候字符在第几个，再让初始字符回到第0的位置（关于循环节的问题一般直接模循环节然后从0开始标序号）

AC代码：

#include "iostream"
#include "string.h"
#include "stack"
#include "queue"
#include "string"
#include "vector"
#include "set"
#include "map"
#include "algorithm"
#include "stdio.h"
#include "math.h"
#pragma comment(linker, "/STACK:102400000,102400000")
#define ll long long
#define bug(x) cout<<x<<" "<<"UUUUU"<<endl;
#define mem(a,x) memset(a,x,sizeof(a))
#define mp(x,y) make_pair(x,y)
#define pb(x) push_back(x)
#define lrt (rt<<1)
#define rrt (rt<<1|1)
using namespace std;
const long long INF = 1e18+1LL;
const int inf = 1e9+1e8;
const int N=1e6+100;
const ll mod=1e9+7;

char s,e,s1[5]=">v<^",s2[5]="^<v>";
int n;
int main(){
    cin>>s>>e>>n;
    int k1=n, k2=n;
    for(int i=0; i<=3; ++i){
        if(s==s1[i]){
            k1+=i;
            break;
        }
    }
    for(int i=0; i<=3; ++i){
        if(s==s2[i]){
            k2+=i;
            break;
        }
    }
    k1%=4, k2%=4;
    if(s1[k1]==e && s2[k2]!=e){
        cout<<"cw\\n";
        return 0;
    }
    if(s2[k2]==e && s1[k1]!=e){
        cout<<"ccw\\n";
        return 0;
    }
    else cout<<"undefined\\n";
    return 0;
}