模拟，没用队列，60pts,求大佬

#include<bits/stdc++.h>
using namespace std;
int n;
int dir[4][2]={{0,-1},{1,0},{0,1},{-1,0}};
string a;
int xt,yt,xw,yw;
bool vis[55][55];
int main(){
	while(cin>>n){
		memset(vis,0,sizeof(vis));
		int m[55][55][3];
		if(n==0) break;
		cin>>a;
		xt=25,yt=30;
		xw=25,yw=11;
		for(int i=11;i<=30;i++){
			vis[25][i]=1;
			if(i==30) continue;
			m[25][i][1]=25;
			m[25][i][2]=i+1;
		}
		bool f=0;
		for(int i=0;i<a.size();i++){
			vis[xw][yw]=0;
			xw=m[xw][yw][1];
			yw=m[xw][yw][2];
			if(a[i]=='N'){
				m[xt][yt][1]=xt-1;
				m[xt][yt][2]=yt;
				xt--;
				if(vis[xt][yt]==1){
					//cout<<1111<<endl;
					cout<<"The worm ran into itself on move "<<i+1<<"."<<endl;
					//     The worm ran into itself on move    m     .
					f=1;
					break;
				}
				vis[xt][yt]=1;
			}
			if(a[i]=='S'){
				m[xt][yt][1]=xt+1;
				m[xt][yt][2]=yt;
				xt++;
				if(vis[xt][yt]==1){
					cout<<"The worm ran into itself on move "<<i+1<<"."<<endl;
					//     The worm ran into itself on move    m     .
					f=1;
					break;
				}
				vis[xt][yt]=1;
			}
			if(a[i]=='W'){
				m[xt][yt][1]=xt;
				m[xt][yt][2]=yt-1;
				yt--;
				if(vis[xt][yt]==1){
					cout<<"The worm ran into itself on move "<<i+1<<"."<<endl;
					//     The worm ran into itself on move    m     .
					f=1;
					break;
				}
				vis[xt][yt]=1;
			}
			if(a[i]=='E'){
				m[xt][yt][1]=xt;
				m[xt][yt][2]=yt+1;
				yt++;
				if(vis[xt][yt]==1){
					cout<<"The worm ran into itself on move "<<i+1<<"."<<endl;
					//     The worm ran into itself on move    m     .
					f=1;
					break;
				}
				vis[xt][yt]=1;
			}
			//cout<<xt<<" "<<yt<<" "<<xw<<" "<<yw<<endl;
			if(!(xt>=1&&xt<=50&&yt>=1&&yt<=50)){
				cout<<"The worm ran off the board on move "<<i+1<<"."<<endl;
				f=1;
				break;
			}
		}
		if(f==0){
			cout<<"The worm successfully made all "<<n<<" moves."<<endl;
			//     The worm successfully made all m moves.
		}
	}
	return 0;
}